WO2023037528A1 - 水質分析装置 - Google Patents
水質分析装置 Download PDFInfo
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- WO2023037528A1 WO2023037528A1 PCT/JP2021/033427 JP2021033427W WO2023037528A1 WO 2023037528 A1 WO2023037528 A1 WO 2023037528A1 JP 2021033427 W JP2021033427 W JP 2021033427W WO 2023037528 A1 WO2023037528 A1 WO 2023037528A1
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- calibration
- aqueous solution
- turbidity
- water quality
- water
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 205
- 238000004458 analytical method Methods 0.000 title claims abstract description 5
- 239000007864 aqueous solution Substances 0.000 claims description 117
- 239000000126 substance Substances 0.000 claims description 16
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 15
- 239000013076 target substance Substances 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 40
- 238000001514 detection method Methods 0.000 description 37
- 238000001917 fluorescence detection Methods 0.000 description 35
- 230000003287 optical effect Effects 0.000 description 33
- 230000005284 excitation Effects 0.000 description 21
- 238000010586 diagram Methods 0.000 description 20
- 238000012545 processing Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 14
- 238000012937 correction Methods 0.000 description 10
- 239000012482 calibration solution Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000004793 Polystyrene Substances 0.000 description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 1
- 239000004312 hexamethylene tetramine Substances 0.000 description 1
- ZGCHATBSUIJLRL-UHFFFAOYSA-N hydrazine sulfate Chemical compound NN.OS(O)(=O)=O ZGCHATBSUIJLRL-UHFFFAOYSA-N 0.000 description 1
- 229910000377 hydrazine sulfate Inorganic materials 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/1012—Calibrating particle analysers; References therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/05—Flow-through cuvettes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
Definitions
- the present invention relates to a water quality analyzer.
- Patent Literature 1 Japanese Patent No. 6436266
- the first aspect of the present invention provides a water quality analyzer.
- the water quality analyzer may be calibrated using a calibrated aqueous solution.
- the water quality analyzer may measure the concentration of the substance to be measured in sample water.
- a water quality analyzer may comprise a flow cell.
- the flow cell may be flowed with sample water and aqueous calibration solutions.
- the water quality analyzer may include a first switching section. The first switching unit may switch between supplying sample water and calibrating aqueous solution to the flow cell.
- the first switching part may be a three-way valve.
- the water quality analyzer may be equipped with a defoaming tank.
- the defoaming tank may remove air bubbles from the sample water before supplying it to the flow cell.
- the first switching section may be located between the flow cell and the defoaming tank in the channel through which the sample water flows.
- the first switching section may be provided below the flow cell in the height direction.
- the first switching unit may be provided upstream with respect to the flow cell in the channel through which the sample water and the calibration aqueous solution flow.
- the water quality analyzer may be equipped with a calibrated aqueous solution removal unit.
- the calibration aqueous solution removal section may remove the calibration aqueous solution from the flow cell at the end of the calibration operation.
- the water quality analyzer may include a second switching section.
- the second switching section may be provided downstream of the flow cell in the channel through which the sample water and the calibrating aqueous solution flow.
- the second switching unit may switch between circulating the sample water or the calibration aqueous solution and discharging the sample water or the calibration aqueous solution.
- the calibration aqueous solution may be either a turbidity standard sample used for turbidity calibration or a fluorescence intensity standard sample used for concentration calibration.
- the second switching section may circulate the calibration aqueous solution.
- the second switching section may discharge the calibration aqueous solution.
- the water quality analyzer may have multiple flow cells.
- the water quality analyzer may include a third switching section.
- the third switching section may be provided between the two flow cells in the channel through which the sample water and the calibration aqueous solution flow.
- FIG. 3 is a diagram showing in detail the flow path 1 of the water quality analyzer 100; 4 is a diagram showing the first switching unit 40 when measuring the turbidity or concentration of the sample water 3 in the water quality analyzer 100.
- FIG. 4 is a diagram showing the first switching unit 40 when performing turbidity calibration or concentration calibration in the water quality analyzer 100.
- FIG. 10 is a diagram showing a water quality analyzer 200 according to another embodiment; 4 is a diagram showing the first switching section 40 and the second switching section 50 when measuring turbidity or concentration of the sample water 3 in the water quality analyzer 200.
- FIG. 10 is a diagram showing a water quality analyzer 200 according to another embodiment; 4 is a diagram showing the first switching section 40 and the second switching section 50 when measuring turbidity or concentration of the sample water 3 in the water quality analyzer 200.
- FIG. 4 is a diagram showing the first switching section 40 and the second switching section 50 when performing concentration calibration in the water quality analyzer 200.
- FIG. 4 is a diagram showing the first switching section 40 and the second switching section 50 when performing turbidity calibration in the water quality analyzer 200.
- FIG. 10 is a diagram showing a water quality analyzer 300 according to another embodiment; It is a figure which shows the water quality analyzer 400 which concerns on a comparative example. It is a figure which shows the comparison of the water quality analyzer 100 of an Example, and the water quality analyzer 400 of a comparative example. It is a figure which shows an example of the relationship between turbidity and fluorescence intensity.
- the Cartesian coordinate axes only specify the relative positions of the components and do not limit any particular orientation.
- the +Z-axis direction and the ⁇ Z-axis direction are directions opposite to each other.
- the Z-axis direction is described without indicating positive or negative, it means a direction parallel to the +Z-axis and -Z-axis.
- the extending direction of the flow cell 2 is defined as the Z-axis.
- the axes perpendicular to the extending direction of the flow cell 2 are defined as the X-axis and the Y-axis.
- the Z-axis direction may be referred to as the height direction.
- the +Z-axis direction is the positive side in the height direction.
- FIG. 1 is a diagram showing a water quality analyzer 100 according to an embodiment.
- the water quality analyzer 100 includes a flow path 1, a flow cell 2, a turbidity detection optical system 10, a fluorescence detection optical system 20, a turbidity detection signal processing unit 13, a fluorescence detection signal processing unit 23, and a control A computing unit 30 is provided.
- the control calculation section 30 has an infrared light lighting circuit 31 , an excitation light lighting circuit 32 , a turbidity calculation section 33 , a fluorescence intensity correction section 34 and a concentration calculation section 35 .
- the turbidity detection optical system 10 and the fluorescence detection optical system 20 are optical systems of the water quality analyzer 100 .
- the water quality analyzer 100 measures the concentration of the substance to be measured in the water sample 3.
- the sample water 3 is, for example, tap water, sewage water, environmental water such as seawater, or waste water.
- the water quality analyzer 100 may be provided onboard.
- the water quality analyzer 100 is a fluorescence detection type water quality analyzer.
- When the sample water 3 contains a fluorescent substance such as PAH when the sample water 3 is irradiated with ultraviolet light (excitation light L3), fluorescence L4 having a wavelength unique to the substance is generated. Since the fluorescence intensity is proportional to the concentration of the contained fluorescent substance, the concentration of the fluorescent substance can be measured with high accuracy.
- the water quality analyzer 100 measures the concentration of the substance to be measured from the fluorescence intensity from the sample water 3 .
- Fluorescence intensity is measured in the fluorescence detection optical system 20 .
- the fluorescence intensity signal s2 is output from the signal processing unit 23 for fluorescence detection.
- the "strength signal” may simply be expressed as "strength”.
- the excitation light L3 and fluorescence L4 may be attenuated due to the influence of light scattering and absorption from the suspended matter (particles). This phenomenon is called the inner filter effect. Due to the inner filter effect, there is a risk that the measurement accuracy of fluorescence intensity will deteriorate in an environment with a high concentration of suspended solids (hereinafter referred to as turbidity). Therefore, it is preferable to correct the fluorescence intensity according to the turbidity of the sample water 3 in order to improve the measurement accuracy of the fluorescence intensity.
- the water quality analyzer 100 measures the turbidity of the sample water 3 along with the fluorescence intensity.
- the water quality analyzer 100 measures the turbidity of the water sample 3 from the intensity of scattered light or transmitted light from the water sample 3 .
- the intensity of the scattered light or transmitted light of the sample water 3 is measured in the turbidity detection optical system 10 .
- the intensity signal s1 of the scattered light or transmitted light of the sample water 3 is output from the signal processing unit 13 for turbidity detection.
- the infrared light lighting circuit 31 is connected to the turbidity detection light emitting section 11 of the turbidity detection optical system 10 .
- the infrared light lighting circuit 31 is a circuit that controls the operation of the turbidity detection light emitting section 11 .
- the excitation light lighting circuit 32 is connected to the fluorescence detection light-emitting section 21 of the fluorescence detection optical system 20 .
- the excitation light lighting circuit 32 is a circuit that controls the operation of the fluorescence detecting light emitting section 21 .
- the turbidity detection signal processing unit 13 processes the intensity signal from the turbidity detection light receiving unit 12 .
- the turbidity detection signal processing unit 13 may amplify the intensity signal from the turbidity detection light receiving unit 12 .
- the turbidity detection signal processor 13 may remove noise from the intensity signal from the turbidity detection light receiver 12 .
- the turbidity detection signal processing unit 13 processes the intensity signal from the turbidity detection light receiving unit 12 and outputs it as an intensity signal s1 of scattered light or transmitted light.
- the intensity signal s1 of scattered light or transmitted light may be an intensity signal corresponding to at least one of the intensity of scattered light and the intensity of transmitted light.
- the turbidity detection signal processing unit 13 calculates the reference turbidity from the intensity of the transmitted light, and determines whether to use the intensity of the scattered light or the intensity of the transmitted light in the turbidity measurement based on the reference turbidity.
- Reference turbidity is turbidity that is temporarily calculated.
- the reference turbidity may be calculated from the intensity of scattered light.
- the control operation unit 30 may calculate the reference turbidity from the intensity of the transmitted light and determine whether to use the intensity of the scattered light or the intensity of the transmitted light in the turbidity measurement based on the reference turbidity.
- the fluorescence detection optical system 20 has a fluorescence detection light emitting section 21 and a fluorescence detection light receiving section 22 .
- the fluorescence detection light emitting unit 21 emits the excitation light L3.
- the fluorescence detection light emitting unit 21 irradiates the sample water 3 inside the flow cell 2-2 with the excitation light L3.
- the excitation light L3 is, for example, ultraviolet rays.
- the fluorescence detection light emitting section 21 may include an ultraviolet light source inside.
- An example of an ultraviolet light source is a xenon flash lamp.
- the ultraviolet light source may be an LED or laser irradiation device.
- the fluorescence detection light receiving section 22 may include an optical filter inside. Since the optical filter is included, the fluorescence detection light-receiving section 22 can receive light in a predetermined wavelength range of the fluorescence L4. In this example, the substance to be measured is PAH. When the wavelength of excitation light for PAH is around 250 nm, the fluorescence wavelength is around 350 nm. Therefore, the transmission wavelength of the optical filter inside the fluorescence detection light-receiving unit 22 is set to 300 nm or more and 400 nm or less, as an example.
- the fluorescence detection signal processing unit 23 processes the fluorescence intensity signal from the fluorescence detection light receiving unit 22 .
- the fluorescence detection signal processing section 23 may amplify the signal from the fluorescence detection light receiving section 22 .
- the fluorescence detection signal processing section 23 may remove noise from the signal from the fluorescence detection light receiving section 22 .
- the fluorescence detection signal processing section 23 processes the fluorescence intensity signal from the fluorescence detection light receiving section 22 and outputs it as a fluorescence intensity signal s2.
- the direction in which the sample water 3 and the calibrated aqueous solution flow in the channel 1 is the direction from the -Z axis to the +Z axis. That is, the direction in which the sample water 3 and the calibration aqueous solution flow is the direction from the height direction negative side to the height direction positive side. Since the direction in which the sample water 3 and the calibrated aqueous solution flow is from the height direction negative side to the height direction positive side, the sample water 3 and the calibrated aqueous solution preferably flow under pressure.
- the first switching section 40 may be provided below the flow cell 2 in the height direction.
- the first switching unit 40 is provided between the flow cell 2 and the defoaming tank 90 in the channel 1 through which the sample water 3 flows.
- the first switching unit 40 is provided between the flow cell 2-1 and the defoaming tank 90 in the channel 1 through which the sample water 3 flows.
- FIG. 4 is a diagram showing the first switching unit 40 when performing turbidity calibration or concentration calibration in the water quality analyzer 100.
- FIG. When performing turbidity calibration or concentration calibration, the regulating valve 42 is closed and the regulating valve 44 is open. Therefore, the flow cell 2 is supplied with the calibration aqueous solution 4 .
- the calibration aqueous solution 4 does not have to flow in the channel 1 . That is, the calibrated aqueous solution 4 may stand still at a certain height in the channel 1 .
- the calibration aqueous solution 4 can be made stationary.
- the calibration aqueous solution 4 (turbidity standard sample) may stand still so as to fill the flow cell 2-1.
- the calibration aqueous solution 4 fluorescence intensity standard sample
- the calibration aqueous solution 4 fluorescence intensity standard sample
- FIG. 5 is a diagram showing a water quality analyzer 200 according to another embodiment.
- the channel 1 of the water quality analyzer 200 is shown in detail.
- the water quality analyzer 200 of FIG. 5 differs from the water quality analyzer 100 of FIG.
- Other configurations of the water quality analyzer 200 of FIG. 5 may be the same as those of the water quality analyzer 100 of FIG.
- the second switching section 50 is a three-way valve.
- the second switching section 50 has a regulating valve 52 and a regulating valve 54 .
- the regulating valve 52 opens and closes the flow path 1 for discharge.
- the regulating valve 54 opens and closes the flow path 1 for circulation.
- regulation valve 52 and regulation valve 54 are open. In the figure, when the regulating valves 52 and 54 are open, the regulating valves are shown in white, and when the regulating valves 52 and 54 are closed, the regulating valves are shown in black.
- FIG. 6 is a diagram showing the first switching section 40 and the second switching section 50 when measuring the turbidity or concentration of the sample water 3 in the water quality analyzer 200.
- FIG. When measuring the turbidity or concentration of the sample water 3, the control valves 42 and 52 are open and the control valves 44 and 54 are closed. Therefore, the sample water 3 flows through the flow cell 2 .
- the sample water 3 is discharged by opening the regulating valve 52 .
- the sample water 3 is easily deteriorated because the sample water 3 is irradiated with the excitation light L3. Therefore, the sample water 3 is preferably discharged rather than circulated.
- the current calibration results may be corrected based on the past implementation history of the calibration work.
- the current calibration result is corrected based on the irradiation history of the infrared light L1 and the excitation light L3.
- the irradiation history of the infrared light L1 and the excitation light L3 is the irradiation time and irradiation intensity of the infrared light L1 and the excitation light L3. If the irradiation time of the infrared light L1 or the excitation light L3 is long, the deterioration of the calibration aqueous solution 4 is accelerated.
- the deterioration of the calibration aqueous solution 4 is accelerated.
- the influence of deterioration of the calibration aqueous solution 4 can be reduced, and the calibration work can be performed more accurately. It is preferable to acquire in advance the relationship between the irradiation history of the infrared light L1 and the excitation light L3 and how the calibration aqueous solution 4 deteriorates.
- the device 80 may supply the calibrated aqueous solution 4 to the regulating valve 44 of the first switching section 40 .
- the calibration aqueous solution 4 that has passed through the regulating valve 54 of the second switching section 50 may return to the device 80 .
- the device 80 may supply the calibration aqueous solution 4 to the regulating valve 44 of the first switching section 40 again. In this example, the device 80 continues to circulate the aqueous calibration solution 4 . Therefore, unlike FIG. 4, the calibration aqueous solution 4 flows through the flow cell 2 during calibration.
- FIG. 9 is a diagram showing a water quality analyzer 300 according to another embodiment.
- the channel 1 of the water quality analyzer 300 is shown in detail.
- the water quality analyzer 300 of FIG. 9 differs from the water quality analyzer 100 of FIG.
- Other configurations of the water quality analyzer 300 of FIG. 9 may be the same as those of the water quality analyzer 100 of FIG.
- the third switching unit 60 switches between supplying the sample water 3 and supplying the calibrated aqueous solution 4 to the flow cell 2-2. That is, the third switching section 60 switches the channel 1 between the flow cell 2-1 and the flow cell 2-2. Therefore, by providing the third switching unit 60 in the water quality analyzer 100, the channel 1 for the sample water 3 and the channel 1 for the calibration aqueous solution can be easily switched between the flow cells 2-1 and 2-2. can be done. When only the flow cell 2-2 is calibrated (concentration calibrated), it is possible to reduce the amount of calibration aqueous solution 4 used.
- the third switching unit 60 is provided downstream of the flow cell 2-1 in the channel 1 through which the sample water 3 and the calibration aqueous solution 4 flow.
- the third switching unit 60 is provided upstream of the flow cell 2-2 in the channel 1 through which the sample water 3 and the calibration aqueous solution 4 flow.
- the third switching unit 60 is provided between the two flow cells 2 in the channel 1 through which the sample water 3 and the calibration aqueous solution 4 flow.
- the third switching section 60 is a three-way valve.
- the third switching section 60 has a regulating valve 62 and a regulating valve 64 .
- a regulating valve 62 opens and closes the channel 1 for the sample water 3 .
- a regulating valve 64 opens and closes the flow path 1 for the calibration aqueous solution.
- FIG. 10 is a diagram showing a water quality analyzer 400 according to a comparative example.
- FIG. 10 shows in detail the flow path 1 of the water quality analyzer 400 when measuring the turbidity or concentration of the sample water 3.
- the water quality analyzer 400 of FIG. 10 differs from the water quality analyzer 100 of FIG. 3 in that the first switching unit 40 is not provided.
- Other configurations of the water quality analyzer 400 of FIG. 10 may be the same as those of the water quality analyzer 100 of FIG.
- FIG. 11 is a diagram showing a comparison between the water quality analyzer 100 of the example and the water quality analyzer 400 of the comparative example.
- the channel diameter of the channel 1 is ⁇ 8 mm
- the total channel length of the water quality analyzer is 400 cm
- the optical system channel length is 40 cm
- the defoaming tank capacity of the defoaming tank 90 is 2000 mL.
- the optical system channel length is the channel length of the channel provided in the optical system of the water quality analyzer.
- the optical system flow path length is the flow path length from the flow path 1 provided in the turbidity detection optical system 10 to the flow path 1 provided in the fluorescence detection optical system 20 .
- the calibration work is carried out with the calibration aqueous solution 4 filling all the channels and the defoaming tank 90 in the water quality analyzer 400. Therefore, the amount of the calibration aqueous solution used for the calibration work is increased, and the amount of the calibration aqueous solution is 2201 ml.
- the water quality analyzer 100 since the water quality analyzer 100 includes the first switching section 40 , the flow path 1 from the defoaming tank 90 is blocked by the first switching section 40 . Therefore, calibration work can be performed in a state in which only the flow path 1 provided near the optical system is filled with the calibrating solution 4 . In this case, since the entire flow path of the water quality analyzer 100 except the optical system flow path and the defoaming tank 90 are not filled with the calibration aqueous solution 4, the amount of the calibration aqueous solution can be reduced to 20. 1 ml. The amount of calibrated aqueous solution of the water quality analyzer 100 during calibration work may be 100 ml or less.
- the amount of calibrated aqueous solution for water quality analyzer 100 is less than 1% compared to the amount of calibrated aqueous solution for water quality analyzer 400 . Therefore, the volume for storing the calibration aqueous solution 4 can be reduced, and the calibration work can be easily performed.
- FIG. 12 is a diagram showing an example of the relationship between turbidity and fluorescence intensity.
- the solid line indicates ideal values and the dotted line indicates measured values.
- the fluorescence intensity correction unit 34 corrects the fluorescence intensity so as to approach the ideal value.
- the fluorescence intensity correction unit 34 corrects the fluorescence intensity by multiplying the fluorescence intensity by a correction coefficient that increases as the turbidity increases.
- the correction coefficient is represented, for example, by the ideal value of fluorescence intensity/the measured value of fluorescence intensity.
- Second switching section 42 Regulating valve 44 Regulating valve 50 Second switching section 52 Regulating valve 54 Regulating valve 60 Third switching section 62 Adjustment Valve, 64... Regulating valve, 70... Syringe, 80... Apparatus, 90... Defoaming tank, 100... Water quality analyzer, 200... Water quality analyzer, 300... Water quality analyzer, 400... Water quality Analysis equipment
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Abstract
Description
特許文献1 特許第6436266号公報
(数1)
D1=b1×s1+e1
(数2)
C1=b2×s3+e2
Claims (9)
- 校正水溶液を用いて校正作業を実施し、試料水中の測定対象物質の濃度を測定する水質分析装置であって、
前記試料水および前記校正水溶液が流れるフローセルと、
前記フローセルに対して、前記試料水を供給するか、前記校正水溶液を供給するかを切り替える第1切り替え部と
を備える水質分析装置。 - 前記第1切り替え部は、三方弁である
請求項1に記載の水質分析装置。 - 前記試料水の気泡を除去して前記フローセルに供給する脱泡槽を更に備え、
前記第1切り替え部は、前記試料水が流れる流路において前記フローセルと前記脱泡槽の間にある
請求項1または2に記載の水質分析装置。 - 前記第1切り替え部は、高さ方向において、前記フローセルの下方に設けられる
請求項1から3のいずれか一項に記載の水質分析装置。 - 前記第1切り替え部は、前記試料水および前記校正水溶液が流れる流路において前記フローセルに対して上流に設けられる
請求項1から4のいずれか一項に記載の水質分析装置。 - 前記校正作業の終了時に、前記フローセルから前記校正水溶液を除去する校正水溶液除去部を更に備える
請求項1から5のいずれか一項に記載の水質分析装置。 - 前記試料水および前記校正水溶液が流れる流路において前記フローセルに対して下流に設けられ、前記試料水または前記校正水溶液を循環させるか、前記試料水または前記校正水溶液を排出するかを切り替える第2切り替え部を更に備える
請求項5に記載の水質分析装置。 - 前記校正水溶液は、濁度校正に用いられる濁度標準試料および濃度校正に用いられる蛍光強度標準試料のいずれかであり、
前記校正水溶液が前記濁度標準試料の場合に、前記第2切り替え部は、前記校正水溶液を循環させ、
前記校正水溶液が前記蛍光強度標準試料の場合に、前記第2切り替え部は、前記校正水溶液を排出する
請求項7に記載の水質分析装置。 - 前記フローセルを複数備え、
前記試料水および前記校正水溶液が流れる流路において2つの前記フローセルの間に設けられた第3切り替え部を更に備える
請求項1から5のいずれか一項に記載の水質分析装置。
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JPH1048103A (ja) * | 1996-08-03 | 1998-02-20 | Horiba Ltd | 気泡の発生しやすい試料液の測定方法 |
JP2000193587A (ja) * | 1998-12-28 | 2000-07-14 | Horiba Ltd | 液体試料の濃度分析装置 |
WO2017199511A1 (ja) * | 2016-05-19 | 2017-11-23 | 富士電機株式会社 | 水質分析計 |
WO2020235198A1 (ja) * | 2019-05-22 | 2020-11-26 | 株式会社堀場アドバンスドテクノ | 水質分析システム、センサモジュール、校正用機器、及び、水質分析システムの校正方法 |
CN112304875A (zh) * | 2020-11-09 | 2021-02-02 | 中国科学院西安光学精密机械研究所 | 一种基于光谱法的水质监测系统及方法 |
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- 2021-09-10 JP JP2023519915A patent/JP7544265B2/ja active Active
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JPH02276927A (ja) * | 1988-08-30 | 1990-11-13 | Shimadzu Corp | 一体型分光器とオンライン用分光計測装置 |
JPH04249745A (ja) * | 1990-12-29 | 1992-09-04 | Horiba Ltd | 液体測定装置 |
JPH1048103A (ja) * | 1996-08-03 | 1998-02-20 | Horiba Ltd | 気泡の発生しやすい試料液の測定方法 |
JP2000193587A (ja) * | 1998-12-28 | 2000-07-14 | Horiba Ltd | 液体試料の濃度分析装置 |
WO2017199511A1 (ja) * | 2016-05-19 | 2017-11-23 | 富士電機株式会社 | 水質分析計 |
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