JP5161639B2 - Sample tray - Google Patents

Description

  The present invention relates to a sample tray, and more particularly to a sample tray used for an autosampler.

In various chemical analyzes including various chromatographies, an autosampler that automatically collects a sample to be measured and supplies the sample to a measuring device or analyzer is often used to reduce labor, shorten time, and improve accuracy. An example of a conventional autosampler is an autosampler 71 shown in FIG. 8A. The autosampler 71 automatically uses a sampling needle 74 that is movable in the horizontal direction and the vertical direction by the arm 72 and the sampling unit 73 from a plurality of sample containers 77 held in a sample rack 76 disposed in the mounting unit 75. Samples are collected and supplied to other analyzers. An autosampler using a sample tray 79 having a plurality of wells 78 as shown in FIG. 8B instead of the sample rack 76 and the sample container 77 is also common (see, for example, FIG. 1 of Patent Document 1). Further, an autosampler of a type in which a sample container is arranged in a sample rack on a circular turntable and the turntable rotates is also well known (see, for example, Patent Document 2 FIG. 4).
JP 63-145963 A (FIG. 1) Japanese Patent Laid-Open No. 7-146219 (FIG. 4)

  In order to control the concentration of a manufacturing line, a processing line, a waste liquid processing line, etc. using a chemical solution as a raw material, it is often necessary to regularly or constantly analyze the concentration and components of a liquid sample in a predetermined process in the line. When an autosampler is used for this analysis, it is necessary to dispense a liquid sample collected regularly or constantly into wells of a sample container or a sample tray, which is troublesome. Therefore, it can be said that performing real-time analysis using a conventional autosampler requires a great deal of labor. On the other hand, introduction of a system such as online chromatography requires a very large initial cost compared to an analytical instrument using an autosampler.

  The present invention provides a sample tray of an autosampler that can eliminate the arrangement of sample containers and sample dispensing.

The present invention is a sample tray used for an autosampler that can automatically collect a liquid sample and supply it to other devices including an analyzer, and can be disposed on the autosampler, and has a concave shape on the upper surface. A liquid flow path, and an introduction port and a discharge port communicating with the liquid flow path ,
An opening is formed in the liquid channel through which the collection needle of the autosampler can be inserted to collect a liquid sample, and the depth of the liquid channel through which the introduction port communicates is the liquid channel of the opening It is characterized by being deeper than the depth of the portion where the is formed .

In the sample tray of the present invention, the depth of the liquid flow path communicating with the introduction port is made deeper than the depth of the liquid flow path in the portion where the opening is formed, so that the liquid sample of the pulsation of the pump that feeds liquid can be obtained. Can be suppressed, and the flow of the liquid sample at the site accessed by the collection needle of the autosampler can be stabilized. According to the second aspect of the present invention, the shape of the liquid channel having a cross section perpendicular to the traveling direction of the liquid channel is a tapered shape whose width becomes narrower in the downward direction, and the portion where the opening is formed is formed. The cross-sectional shape of the liquid flow path is not a taper, but a rectangular shape, so that the amount of liquid sample staying in the liquid flow path can be reduced, and in a state with less time difference from the concentration change of the measurement target Liquid samples can be collected.

[Autosampler]
In the present invention, the autosampler is an autosampler that can automatically collect and supply a liquid sample, and preferably includes a sample tray mounting section, and more preferably, according to a set condition or program. A liquid sample placed in a mounting portion is automatically collected, and after dilution as necessary, the sample collected is supplied to another device including an analyzer such as HPLC. The autosampler preferably includes a collection mechanism including an arm and a collection needle, and more preferably collects a liquid sample by the collection mechanism.

  In the present invention, the “sample tray mounting portion” is a space in the autosampler in which the sample tray of the present invention can be placed, and preferably a tool or container for placing a liquid sample in a conventionally known autosampler. Including the location where The tools or containers for arranging the liquid sample include conventionally known sample trays, sample racks, sample holders, well plates and the like. That is, the sample tray of the present invention preferably includes a tray that can be used in place of a sample tray attached to a conventionally known autosampler.

  The autosampler according to the present invention is preferably an autosampler that can collect the liquid sample held in the sample tray of the present invention in a state where the sample tray of the present invention is disposed in the sample tray mounting portion. Such an autosampler is not particularly limited, and a conventionally known autosampler for HPLC can be used. For example, if a sample tray attached to a conventionally known HPLC autosampler is removed, the sample tray of the present invention can be used as an applicable autosampler. If the sample tray of the present invention can be arranged, the autosampler may be, for example, an autosampler of a type to which the sample tray or the like is fixed (for example, Patent Document 1) or a turntable type in which the sample tray or the like rotates. (For example, Patent Document 2).

[Sample tray]
The present invention uses a sample tray having a liquid flow path instead of a conventionally known sample tray, sample rack, sample holder, well plate, etc., in which a plurality of sample containers and liquid samples are held at a plurality of locations. The knowledge that if a liquid sample is circulated, the labor of dispensing the sample into the sample container or well collected from the measurement target at each measurement can be saved, thereby reducing the labor required for regular or regular measurement. based on. In the present invention, if a liquid sample is circulated from the measurement target to the sample tray, the liquid sample to be measured can be supplied in real time via the autosampler. Based on the knowledge that real-time analysis is possible.

That is, the present invention, in one embodiment, is a sample tray used for an autosampler that can automatically collect a liquid sample and supply it to other devices including an analyzer, and can be disposed on the autosampler. Provided with a concave liquid channel on the top surface, and with an inlet and a discharge port communicating with the liquid channel, and a liquid sample is collected by inserting a sampling needle of the autosampler into the liquid channel A possible opening is formed, and the depth of the liquid channel through which the introduction port communicates is deeper than the depth of the liquid channel in the portion where the opening is formed . In addition, the shape of the liquid channel having a cross section perpendicular to the traveling direction of the liquid channel is a tapered shape whose width becomes narrower in the downward direction, and the cross-sectional shape of the liquid channel in the portion where the opening is formed is Instead of being tapered, it is a rectangular shape. Further, the introduction port is formed on the side surface of the sample tray and in the vicinity of the bottom surface of the fluid flow path.

  If the sample tray of the present invention is applied to an autosampler, the liquid sample can be supplied from the autosampler to other devices including the analyzer without dispensing the liquid sample into sample containers or wells. Preferably it plays. In addition, it is preferable that the liquid sample derived from the measurement target is introduced into the sample tray of the present invention from the introduction port and distributed, thereby enabling real-time analysis of the measurement target.

  In the present invention, the “liquid sample” is one that can be introduced from the inlet of the sample tray of the present invention and can be discharged from the outlet, and is preferably a fluid that can be collected from the collection needle of the autosampler. There is no particular restriction on the. Introduction and discharge of a liquid sample includes introduction and discharge using a device such as a pump.

  In the present invention, the phrase “a liquid sample can be supplied” by the autosampler means that the liquid sample can be discharged from the autosampler and sent to another apparatus. The other devices are not particularly limited, and include various analysis devices and pretreatment devices for the analysis.

  In the present invention, the “liquid channel” refers to a concave groove formed on the upper surface of the sample tray of the present invention. The liquid channel communicates with an inlet and an outlet formed on the side surface of the sample tray. From the viewpoint of efficiently discharging the liquid sample introduced into the sample tray, the inlet is preferably formed at one end or near one end of the liquid channel, and the outlet is formed at the other end or near the other end of the liquid channel. It is preferred that From the viewpoint of reflecting the concentration and components of the measurement target in the liquid sample in the liquid channel with a shorter time lag, the liquid sample introduced from the inlet flows from the one end to the other end of the liquid channel and is discharged from the outlet. It is preferable.

  The form of the inlet is not particularly limited, but is preferably a hole formed on the side surface of the sample tray from the viewpoint of improving operability, and the tube or the tube terminal is provided so that the liquid sample can be introduced through the tube or the like. More preferably, it can be connected. The position where the introduction port is formed is not particularly limited as long as it can communicate with the liquid flow path. From the viewpoint of promoting stirring of the introduced liquid sample, the introduction port is preferably formed in the vicinity of the bottom surface of the liquid channel. Further, by forming the inlet near the bottom surface, it is possible to easily remove the liquid in the liquid channel at the time of cleaning or replacement of the liquid sample. In order to introduce a liquid sample into the liquid channel through the introduction port, it is preferable to use a device such as a pump from the viewpoint of improving operability. The sample tray of the present invention may include a plug for detachably closing the introduction port.

  The form of the discharge port is not particularly limited, but may be, for example, a hole formed in the side surface of the sample tray, or a concave shape in which the side surface of the sample tray is partially lowered. Good. When the discharge port is a hole, it is more preferable that the tube or the tube terminal can be connected to the discharge port so that the liquid sample can be discharged through the tube or the like from the viewpoint of improving operability. Further, when the discharge port is a hole, the position where the discharge port is formed is not particularly limited as long as it is a position where it can communicate with the liquid channel, but the position of the liquid sample in the liquid channel at the position of the discharge port is not limited. From the viewpoint of adjusting the height, it is preferable that the collection needle of the autosampler is at a position where a sufficient liquid level can be maintained to collect the liquid sample held in the liquid channel. In order to discharge the liquid sample from the liquid flow path through the hole discharge port, it is preferable to use a device such as a pump from the viewpoint of improving operability, and the same amount as the liquid sample introduced from the introduction port is discharged. More preferably. The sample tray of the present invention may include a plug for detachably closing the discharge port.

  When the shape of the discharge port is a concave shape in which the side surface of the sample tray is partially lowered, that is, a shape opened to the upper surface, the liquid sample can be discharged by overflow from the discharge port. This form is preferable in that the same amount as the liquid sample introduced from the introduction port is discharged due to overflow from the discharge port, and the handleability is improved. In addition, since the level of the liquid sample in the liquid channel is determined at the position of the discharge port in the discharge port of this form, the sampling needle of the autosampler is held in the liquid channel at the position of the discharge port. It is preferable that the position is such that a sufficient liquid level can be maintained at which a liquid sample can be collected. In addition, the autosampler of this form preferably includes a drainage tank that collects the drainage discharged due to overflow and preferably temporarily holds the drainage from the viewpoint of further improving handling.

  A plurality of combinations of the inlet, the single liquid channel, and the outlet may be formed on a single sample tray. By providing multiple combinations of inlets, single liquid flow paths, and outlets, liquid samples to be measured at multiple locations such as production lines, processing lines, and waste liquid processing lines can be used without undue effort. It can be supplied to other devices regularly or constantly. Thereby, preferably, a plurality of measurement objects in a production line, a processing line, a waste liquid processing line, and the like can be analyzed in real time via a single autosampler.

  The liquid flow path of the sample tray of the present invention is preferably formed at a position where the liquid sample can be collected by the autosampler when the sample tray of the present invention is arranged in the autosampler. The liquid sample held in the liquid channel is preferably collected by inserting a collection needle of an autosampler and supplied to another device or the like. It is preferable that the depth of the liquid channel is sufficient to allow the collection sample of the autosampler to collect the liquid sample held in the liquid channel. The width of the liquid channel is preferably a width that is sufficient for the liquid sample to circulate, and is preferably a width that is easily accessible by the collection needle of the autosampler. In the autosampler, it is preferable that a liquid sample at a predetermined location can be collected by a mechanism including an arm that mainly helps the horizontal movement of the collection needle and a collection unit that mainly helps the vertical movement of the collection needle. However, in the present invention, the method of collecting the liquid sample of the autosampler is not limited to this method.

  The length of the liquid channel is not particularly limited as long as a portion accessible by the collection needle of the autosampler can be secured. In the sample tray of the present invention, the depth of the fixed region of the liquid channel including the boundary with the inlet and / or the fixed region of the liquid channel including the boundary with the outlet is the depth of the other liquid channel. It is preferable that it is deeper than this. That is, it is preferable that at least one of the vicinity of the introduction port and the vicinity of the discharge port, more preferably the depth of both of the liquid channels is deeper than the depth of the liquid channel at the site accessed by the collection needle of the autosampler. By adopting such a structure, preferably, the influence of the pulsation of the pump to be pumped on the liquid sample can be suppressed, and the flow of the liquid sample in the liquid flow path, more preferably, the site accessed by the collection needle of the autosampler The flow of the liquid sample can be stabilized.

  The shape of the liquid channel having a cross section perpendicular to the traveling direction of the liquid channel is not particularly limited. For example, it may be a rectangular shape, and the amount of the liquid sample staying in the liquid channel can be reduced, and the measurement target It may be a tapered shape or a trapezoidal shape (tapered shape) whose width becomes narrower in the downward direction from the point that it becomes possible to collect a liquid sample in a state where the time difference and the time difference are smaller. However, when a liquid channel having a tapered or trapezoidal cross section is formed as described above, it is preferable to provide an opening described later in order to avoid contact between the sampling needle of the autosampler and the channel wall surface.

  If the sample tray of this invention can be arrange | positioned in the sample tray mounting part of the autosampler to which the sample tray of this invention is applied, the shape will not be restrict | limited in particular. In the case of an autosampler of a type to which a sample tray or the like is fixed, the shape of the sample tray of the present invention is preferably a rectangular parallelepiped or a substantially rectangular parallelepiped, or a cube or a substantially cube. In the case of these shapes, it is preferable that the introduction port and the discharge port are formed on the same side surface of the sample tray from the viewpoint of easy handling of the tube connected thereto and easy incorporation into the autosampler. On the other hand, in the case of a turntable type autosampler in which the sample tray or the like rotates, the shape of the sample tray of the present invention is preferably the same shape as the turntable, that is, a cylindrical shape.

  The liquid channel of the sample tray of the present invention preferably has an opening wider than the liquid channel from the viewpoint of facilitating access to the liquid sample of the collection needle of the autosampler. The number of the openings may be one or two or more. In the autosampler to which the sample tray of the present invention is applied, it is preferable that the liquid sample is collected from the opening. Even when the cross section of the liquid flow path is tapered or trapezoidal as described above, the opening is tapered to avoid contact between the sampling needle of the autosampler and the flow wall surface. The shape or the trapezoid is not used, that is, the cross-sectional shape is preferably a rectangular shape or a substantially rectangular shape. The “width” of the opening is wider than the liquid channel, for example, that the length of the opening in the direction perpendicular to the flow direction of the liquid channel includes a portion where the length of the liquid channel is longer. Preferably, when the shape seen from the upper surface of the opening is a circle, the diameter is larger than the width of the liquid channel.

  The magnitude | size of the sample tray of this invention will not be restrict | limited especially if it can arrange | position to the sample tray mounting part of the autosampler to which the sample tray of this invention is applied. When the main body shape is a rectangular parallelepiped or a cube, the width and / or depth is, for example, 50 mm to 500 mm, and the height is, for example, 10 mm to 100 mm. The width of the liquid channel is, for example, 2 mm to 20 mm, and the depth is, for example, 8 mm to 80 mm. The material of the sample tray of the present invention is not particularly limited, and a plastic or metal resistant to the liquid sample to be measured or a material coated with these can be used. The sample tray of the present invention may be of a type in which a material other than the liquid channel, the introduction port, and the discharge port is filled with a forming material. A hollow type forming an introduction port, a discharge port and the like is preferable. The method for producing the sample tray of the present invention is not particularly limited, and those skilled in the art can produce the sample tray by a conventionally known method.

[One Embodiment of Sample Tray of the Present Invention]
An embodiment of the sample tray of the present invention will be described with reference to FIGS. In these drawings, the same portions are denoted by the same reference numerals. FIG. 1 is a perspective view of an embodiment of a sample tray of the present invention. The sample tray 10 has a rectangular parallelepiped shape, is provided with a liquid flow path 2 on the upper surface, is formed on the same side surface, and has an introduction port 3 and a discharge port 4 respectively communicating with both ends of the liquid flow channel 2. Prepare. The liquid flow path 2 has four openings 5 wider than the liquid flow path 2. The depth of the liquid channel 2 in the vicinity of the inlet 3 and the outlet 4 is deeper than the depth of the liquid channel 2 in the vicinity of which the opening 5 is formed. The introduction port 3 is formed at substantially the same position as the bottom surface of the fluid flow path 2. The outlet 4 is formed in the opening 5 at a position high enough to allow the collection needle of the autosampler to collect the liquid sample held in the liquid flow path. FIG. 2 shows an example of an autosampler in which the sample tray 10 of FIG. 1 is arranged. The autosampler 20 includes a liquid sample collection mechanism including a collection needle 12 that collects a liquid sample, an arm 11 that enables the collection needle 12 to move in a horizontal direction and a vertical direction, and a collection unit 13, and a sample tray. A mounting portion 14 is provided. In FIG. 2, the sample tray 10 is disposed in the sample tray mounting portion 14. For example, the autosampler 20 can collect the liquid sample existing in the opening 5 by inserting the collection needle 12 in accordance with a set condition or program, and supply the collected liquid sample to other devices including the analyzer. It is preferable.

[Other Embodiments of Sample Tray of the Present Invention]
Another embodiment of the sample tray of the present invention will be described with reference to FIGS. In these drawings, the same portions as those in FIGS. 1 and 2 are denoted by the same reference numerals. FIG. 3 is a perspective view of another embodiment of the sample tray of the present invention. The sample tray 30 has a rectangular parallelepiped shape, includes the liquid flow path 2, and further includes an introduction port 3 and a discharge port 4 that are formed on the same side surface of the main body and communicate with both ends of the liquid flow path 2. The fluid flow path 2 has five openings 5 formed therein. The depth of the liquid channel 2 near the inlet 3 and the outlet 4 is deeper than the depth of the liquid channel 2 in which the opening 5 is formed. The introduction port 3 and the discharge port 4 are formed at a position high enough to allow the collection needle of the autosampler to collect the liquid sample held in the liquid flow path at the opening 5. 4A is a top view of the sample tray of FIG. 3, and FIG. 4B is a cross-sectional view taken along line XX ′ of FIG. 4A. As shown in FIG. 4B, the liquid channel 2 may be formed so that the cross section thereof is tapered. Thereby, the amount of the liquid sample staying in the liquid channel can be reduced, and it is possible to collect the liquid sample in a state where there is less time difference from the concentration change of the measurement target. In addition, the opening 5 is preferably rectangular or substantially rectangular in cross section within the reach of the sampling needle.

[Another Embodiment of Sample Tray of the Present Invention]
Another embodiment of the sample tray of the present invention will be described with reference to FIG. In these drawings, the same portions as those in FIGS. 1 and 2 are denoted by the same reference numerals. FIG. 5 is a perspective view of still another embodiment of the sample tray of the present invention. The sample tray 40 has a rectangular parallelepiped shape, and includes a liquid channel 2 and an introduction port 3 and a discharge port 4 that are formed on the same side surface of the main body and communicate with both ends of the liquid channel 2. The fluid flow path 2 has four openings 5 formed therein. The introduction port 3 is formed at substantially the same position as the bottom surface of the fluid flow path 2. The discharge port 4 is a concave discharge port formed by partially lowering the side surface of the sample tray 40, and is open to the upper surface. The liquid channel 2 is discharged from the discharge port 4 due to overflow by the amount introduced from the introduction port 3. The discharge port 4 is formed at a position high enough to allow the collection needle of the autosampler to collect the liquid sample held in the liquid channel in the opening 5. Furthermore, the sample tray 40 includes a drainage tank 6 that temporarily collects and holds the liquid discharged from the discharge port 4 due to overflow. The drainage tank 6 includes a hole 7 and can discharge the drainage retained in the drainage tank 6 from the hole 7.

[Another Embodiment of Sample Tray of the Present Invention]
Still another embodiment of the sample tray of the present invention will be described with reference to FIG. FIG. 6 is a perspective view showing still another example of the sample tray of the present invention and an autosampler equipped with the sample tray. The sample tray 50 includes a liquid channel 52, an inlet 53, an outlet 54, and an opening 55, and the inlet 53 and the outlet 54 are in communication with the liquid channel 52, respectively. The sample tray 50 is disposed on a turntable 56 of a turntable type autosampler 51. The autosampler 51 includes a collection needle 58 for collecting a liquid sample, and a liquid sample collection mechanism including an arm 57 and a collection unit 59 that allow the collection needle 58 to move in the vertical direction. The autosampler 51 can, for example, collect the liquid sample existing in the opening 55 by inserting the collection needle 58 in accordance with a set condition or program, and supply the collected liquid sample to other devices including the analyzer. It is preferable. The turntable 56 may not be rotated.

[How to use the sample tray of the present invention]
As described above, the sample tray of the present invention is preferably used by being disposed on the sample tray of the autosampler. The liquid sample may be arranged in advance in the liquid channel, or may be supplied from the inlet. The supply of the liquid sample from the inlet is preferably performed by fluidly connecting a tube or the like to the inlet, and more preferably using a pump or the like. For example, the liquid sample to be measured can be supplied intermittently or continuously to the inlet of the sample tray of the present invention by sucking the liquid sample from the measurement target with a pump or the like while being placed in the sample tray mounting portion. It can be supplied to other devices including the analyzer intermittently or continuously via an autosampler. Therefore, according to the sample tray of the present invention, it is possible to analyze the measurement target regularly or constantly via the autosampler, and also to perform so-called real-time analysis. Here, “measurement object” refers to liquids in storage tanks, reaction tanks, and piping in various production lines and processing lines, various liquids in the manufacturing process, liquids in various processing processes such as waste liquid discharged in the manufacturing process, etc. Including, but not limited to.

  When discharging the liquid sample from the discharge port, for example, it is preferable to fluidly connect a tube or the like to the discharge port, and it is more preferable to use a pump or the like. The liquid sample discharged from the discharge port may be returned to the measurement target or discarded as it is.

  Another aspect of the present invention is a method of using an autosampler, which includes using the sample tray of the present invention. Another aspect of the present invention is an analysis method, which includes supplying a sample to be analyzed using the sample tray and autosampler of the present invention. Moreover, this invention is a manufacturing method or a processing method as another aspect, Comprising: Analyzing a liquid sample using the sample tray of this invention in a manufacturing line or a processing line is included.

[One Embodiment of Use of Sample Tray of the Present Invention]
One embodiment of the method of using the sample tray of the present invention will be described with reference to FIG. FIG. 7 is a schematic view showing an example of use of the sample tray of the present invention, and shows an example of analyzing the sample tank 60 using the sample tray 10 and the autosampler 20 shown in FIGS. 1 and 2 are denoted by the same reference numerals. A liquid sample is introduced from the sample tank 60 into the inlet 3 by a pump. The introduced liquid sample flows from the introduction port through the liquid flow path 2 to the boundary with the discharge port 4. The liquid sample is discharged from the discharge port 4 by a pump and returned to the sample tank 60. If the liquid sample is continuously introduced and discharged by the pump, the change in the component of the liquid in the sample tank and the change in the component of the liquid sample held in the liquid channel 2 can be matched. Therefore, by periodically or constantly collecting and analyzing the autosampler arm 11, the sampling unit 13 and the sampling needle 12 in the opening 5, the labor of manually collecting and preparing the sample from the sample tank 60 can be saved. However, real-time analysis using an autosampler is possible.

  As described above, according to the present invention, it is possible to perform regular or constant analysis while saving labor and suppressing initial investment, and thus it is useful for component management of various production lines and processing lines. .

FIG. 1 is a perspective view showing an example of a sample tray of the present invention. FIG. 2 is a schematic view showing an example of an autosampler in which the sample tray of the present invention is arranged. FIG. 3 is a perspective view showing another example of the sample tray of the present invention. 4A is a top view of the sample tray of FIG. 3, and FIG. 4B is a cross-sectional view taken along line X-X ′ of FIG. 4A. FIG. 5 is a perspective view showing another example of the sample tray of the present invention. FIG. 6 is a schematic view showing still another example of the sample tray of the present invention and an autosampler equipped with the sample tray. FIG. 7 is a schematic view showing an example of use of the sample tray of the present invention. FIG. 8A is a schematic diagram of an example of a conventional autosampler. FIG. 8B is a schematic diagram of an example of a sample tray used in a conventional autosampler.

Explanation of symbols

2: Liquid channel 3: Inlet port 4: Outlet port 5: Opening portion 10: Sample tray 11: Arm 12: Collection needle 13: Collection portion 14: Mounting portion 20: Autosampler 30: Sample tray

Claims (4)

A sample tray used for an autosampler that can automatically collect a liquid sample and supply it to other devices including an analyzer,
The autosampler can be disposed, has a concave liquid channel on the upper surface, and has an inlet and an outlet that communicate with the liquid channel, and a sampling needle of the autosampler is provided in the liquid channel. An opening that can be inserted to collect a liquid sample is formed, and the depth of the liquid channel through which the introduction port communicates is deeper than the depth of the liquid channel in the portion where the opening is formed And a sample tray. The shape of the liquid channel having a cross section perpendicular to the traveling direction of the liquid channel is a tapered shape whose width becomes narrower in the downward direction, and the cross-sectional shape of the liquid channel in the portion where the opening is formed is a tapered shape. The sample tray according to claim 1, wherein the sample tray has a rectangular shape. The sample tray according to claim 1 or 2 , wherein the introduction port is formed on a side surface of the sample tray at the same position as a bottom surface of the fluid flow path . The sample tray according to any one of claims 1 to 3, wherein the introduction of the liquid sample is performed from the introduction port to which a tube is connected.

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