CN110274901B - Portable methanol color development test paper and preparation method thereof - Google Patents
Portable methanol color development test paper and preparation method thereof Download PDFInfo
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- CN110274901B CN110274901B CN201910662092.2A CN201910662092A CN110274901B CN 110274901 B CN110274901 B CN 110274901B CN 201910662092 A CN201910662092 A CN 201910662092A CN 110274901 B CN110274901 B CN 110274901B
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Abstract
The invention discloses a portable methanol color test paper and a preparation method thereof, wherein the portable methanol color test paper consists of a fiber thin layer, a protective agent and a color developing agent; wherein the fiber sheet is derived from natural polysaccharides. The natural polysaccharide is selected from guar gum, carboxymethyl guar gum, xanthan gum, sesbania gum or carboxymethyl cellulose; the protective agent is selected from sodium stearate, and the color developing agent is selected from fuchsin and sodium sulfite. The thin-layer material dissolving natural polysaccharide in water is used for dissolving fuchsin in sodium stearate micelle, the natural polysaccharide water solution is also aggregated, sodium sulfite is dissolved in a water phase, a specific state is still kept after freeze-drying, and finally the mixture is dried and pressed at normal temperature to obtain the portable methanol color development test paper. The method can break the aqueous solution determination method, the fuchsin sodium sulfite is gathered and protected in the fiber thin layer to prevent the oxidation of the fiber thin layer, the final form is portable paper, the use is convenient, and the principle is simple and ingenious.
Description
Technical Field
The invention belongs to the field of methanol detection, and particularly relates to a portable methanol color development test paper and a preparation method thereof.
Background
Methanol is a colorless liquid with strong anesthetic property, is absorbed by respiratory tract and digestive tract, can be partially absorbed by skin, and is distributed in cerebrospinal fluid, blood, bile and urine with high content. Methanol is slowly oxidized and excreted in vivo, has obvious accumulation effect, has anesthetic effect on nervous system, and can cause metabolic disorder of organism, retinal cell and optic nerve damage and optic nerve demyelination. The methanol in the white spirit is mainly generated by decomposing pectin in brewing raw materials and auxiliary materials, the methanol content is low in the fermentation process, no harm is caused to human bodies, but when the pectin-containing raw materials such as dried sweet potatoes, bran coats, wild plants and the like are used for replacing grains as main brewing raw materials, the methanol content in the white spirit is increased. In the household cosmetics, the solvent can dissolve effective skin care ingredients, but the content of methanol is too high, so that the skin is seriously damaged. We often want to detect the presence of methanol in white spirit or cosmetics on a daily basis. The fuchsin sulfurous acid method has wide application in a base layer due to simple instruments and cheap reagents, but the method also has the defects of complicated color developing agent preparation, easy failure and unstable sample color development, so that the error of a measuring result is larger. Aiming at the problems, the novel methanol color test paper is provided, has the advantages of simple operation, time saving and the like, and is widely applied.
Disclosure of Invention
The invention aims to provide a portable methanol color test paper and a preparation method thereof, which can break the aqueous solution determination method, gather and protect fuchsin sodium sulfite in a fiber thin layer to prevent oxidation, and the final form is portable paper, which is convenient to use and has simple and ingenious principle.
In order to achieve the purpose, the invention adopts the following technical scheme:
a portable methanol color test paper is composed of a fiber thin layer, a protective agent and a color developing agent; wherein the fiber sheet is derived from natural polysaccharides.
The natural polysaccharide is selected from guar gum, carboxymethyl guar gum, xanthan gum, sesbania gum or carboxymethyl cellulose.
The protective agent is sodium stearate, and the color developing agent is fuchsin and sodium sulfite.
A preparation method of portable methanol color test paper comprises the following steps:
aggregating fuchsin in sodium stearate micelles to obtain an aqueous solution of aggregated fuchsin sodium stearate;
preparing a natural polysaccharide aqueous solution, standing and swelling for later use after the preparation is finished;
adding aqueous solution of sodium stearate of aggregated fuchsin into the natural polysaccharide aqueous solution to obtain aqueous solution of fuchsin aggregated polysaccharide;
adding a sodium sulfite aqueous solution into a fuchsin aggregation type polysaccharide aqueous solution to obtain a mixed solution;
pouring the mixed solution into a mold, transferring the mold to a cold trap, carrying out constant temperature treatment, freeze-drying, and completely drying to obtain a natural polysaccharide sponge keeping fuchsin sodium sulfite aggregation;
drying and pressing the natural polysaccharide sponge body keeping fuchsin sodium sulfite aggregation to obtain the portable methanol color development test paper.
As a further improvement of the invention, the natural polysaccharide is guar gum, carboxymethyl guar gum, xanthan gum, sesbania gum or carboxymethyl cellulose, and the concentration of the aqueous solution of the natural polysaccharide is 0.5-2%.
As a further improvement of the invention, the specific preparation method of the aqueous solution of sodium stearate of the poly-fuchsin comprises the following steps:
weighing ground basic fuchsin, and dissolving in sodium stearate water solution; the mass ratio of the sodium stearate aqueous solution to the basic fuchsin is 100 (1-10); fuchsin aggregates in micelles formed by sodium stearate at room temperature to obtain an aqueous solution of aggregated fuchsin in sodium stearate.
As a further improvement of the invention, the mass ratio of the natural polysaccharide aqueous solution to the sodium stearate aqueous solution of the poly-fuchsin is 100 (10-30).
As a further improvement of the invention, the mass ratio of the fuchsin aggregation type polysaccharide aqueous solution to the sodium sulfite aqueous solution is 100 (1-10).
As a further improvement of the invention, the temperature of the cold trap is-50 to-30 ℃, and the constant temperature is kept for 4 to 6 hours; and adjusting the pressure in the freeze dryer to 5-10Pa, and keeping the pressure for 20-26 h.
As a further improvement of the invention, the drying and pressing temperature is 100-110 ℃ and the pressure is 25-35 Mpa.
Compared with the prior art, the invention has the following advantages:
the invention aims to provide a portable methanol color test paper which can break an aqueous solution determination method, gathers and protects fuchsin sodium sulfite in a fiber thin layer to prevent oxidation, and has the final shape of portable paper, convenient use and simple and ingenious principle.
The preparation method of the invention utilizes a thin-layer material obtained by dissolving natural polysaccharide in water to dissolve fuchsin in sodium stearate micelle, the natural polysaccharide water solution also generates aggregation, sodium sulfite is dissolved in a water phase, the sodium sulfite is still kept in a specific state after freeze-drying, and finally the sodium sulfite is dried and pressed at normal temperature to obtain the portable methanol color test paper. The method can break the aqueous solution determination method, the fuchsin sodium sulfite is gathered and protected in the fiber thin layer to prevent the oxidation of the fiber thin layer, the final form is portable paper, the use is convenient, and the principle is simple and ingenious.
Drawings
FIG. 1 microscopic section (200 times) of the portable methanol color test paper of example 1;
FIG. 2 microscopic section (2000 times) of the portable methanol color test paper of example 2.
Detailed Description
The invention relates to a portable methanol color development test paper, which consists of a fiber thin layer, a protective agent and a color developing agent; wherein the fiber sheet is derived from natural polysaccharides. The natural polysaccharide is selected from guar gum, carboxymethyl guar gum, xanthan gum, sesbania gum or carboxymethyl cellulose; the protective agent is selected from sodium stearate, and the color developing agent is selected from fuchsin and sodium sulfite.
The idea of the invention is as follows: the thin-layer material dissolving natural polysaccharide in water is used for dissolving fuchsin in sodium stearate micelle, the natural polysaccharide water solution is also aggregated, sodium sulfite is dissolved in a water phase, a specific state is still kept after freeze-drying, and finally the mixture is dried and pressed at normal temperature to obtain the portable methanol color development test paper. The method can break the aqueous solution determination method, the fuchsin sodium sulfite is gathered and protected in the fiber thin layer to prevent the oxidation of the fiber thin layer, the final form is portable paper, the use is convenient, and the principle is simple and ingenious.
The preparation method of the invention specifically comprises the following operations:
ground basic fuchsin was weighed and dissolved in 10% aqueous sodium stearate at 25 ℃. The mass ratio of the sodium stearate aqueous solution to the basic fuchsin is 100 (1-10). Fuchsin aggregates in micelles formed by sodium stearate at room temperature to obtain an aqueous solution of aggregated fuchsin in sodium stearate. Preparing natural polysaccharide water solution with concentration of 0.5-2%, standing and swelling for use after preparation. Adding a sodium stearate aqueous solution of the poly-fuchsin into the natural polysaccharide aqueous solution to ensure that the mass ratio of the natural polysaccharide to the sodium stearate aqueous solution of the poly-fuchsin is 100 (10-30) to obtain the fuchsin aggregated polysaccharide aqueous solution. Then 10% sodium sulfite aqueous solution is added to ensure that the mass ratio of the fuchsin aggregation type polysaccharide aqueous solution to the sodium sulfite aqueous solution is 100 (1-10). Pouring the finally obtained liquid into a mold, transferring the liquid to a cold trap, cooling and carrying out constant temperature treatment, and transferring the liquid to a freeze dryer, wherein the temperature of the cold trap is-50 to-30 ℃, and the constant temperature is kept for 4 to 6 hours; and adjusting the pressure in the freeze dryer to 5-10Pa, and keeping the pressure for 20-26 h. Complete drying was ensured and a natural polysaccharide sponge was obtained that kept the fuchsin sodium sulfite aggregated. Drying and pressing the sponge body, wherein the drying and pressing temperature is 100-110 ℃, and the pressure is 25-35 Mpa, so as to obtain the portable methanol color development test paper.
The preparation process of the present invention will be described in detail with reference to specific examples.
Example 1
Ground basic fuchsin was weighed and dissolved in 10% aqueous sodium stearate at 25 ℃. The mass ratio of the sodium stearate aqueous solution to the basic fuchsin is 100: 3. Fuchsin aggregates in micelles formed by sodium stearate at room temperature to obtain an aqueous solution of aggregated fuchsin in sodium stearate. And preparing a guanidine gum aqueous solution with the concentration of 1.0%, and standing and swelling for later use after the preparation is finished. Adding aqueous solution of sodium stearate of aggregated fuchsin into the aqueous solution of guar gum, and ensuring that the mass ratio of the aqueous solution of guar gum to the aqueous solution of sodium stearate of aggregated fuchsin is 100:10 to obtain aqueous solution of fuchsin aggregated guar gum. Then 10% aqueous sodium sulfite solution is added to ensure that the mass ratio of the fuchsin aggregation type guanidine gum aqueous solution to the aqueous sodium sulfite solution is 100: 5. And pouring the finally obtained liquid into a mold, transferring the liquid to a cold trap, cooling to-40 ℃, carrying out constant-temperature treatment, and transferring the liquid to a freeze dryer to ensure complete drying, thereby obtaining the natural polysaccharide sponge keeping fuchsin sodium sulfite aggregation. Pressing the sponge body under the pressure of 30Mpa to obtain the portable methanol color test paper. And preparing a mixed system with the mass ratio of ethanol to methanol being 100:10, and developing by using test paper.
Fig. 1 is a microscopic section (200 times) of the portable methanol color test paper in example 1, and the circled area is a magenta aggregation area, which can be clearly seen in the figure that the magenta aggregation area is protected in the fiber thin layer, so as to achieve the purpose of preventing oxidation.
Example 2
Ground basic fuchsin was weighed and dissolved in 10% aqueous sodium stearate at 25 ℃. The mass ratio of the sodium stearate aqueous solution to the basic fuchsin is 100: 5. Fuchsin aggregates in micelles formed by sodium stearate at room temperature to obtain an aqueous solution of aggregated fuchsin in sodium stearate. And preparing a guanidine gum aqueous solution with the concentration of 2%, and standing and swelling for later use after the preparation is finished. Adding aqueous solution of sodium stearate of aggregated fuchsin into the aqueous solution of guar gum, and ensuring that the mass ratio of the aqueous solution of guar gum to the aqueous solution of sodium stearate of aggregated fuchsin is 100:30 to obtain aqueous solution of fuchsin aggregated guar gum. Then 10% aqueous sodium sulfite solution is added to ensure that the mass ratio of the fuchsin aggregation type guanidine gum aqueous solution to the aqueous sodium sulfite solution is 100: 5. And pouring the finally obtained liquid into a mold, transferring the liquid to a cold trap, cooling to-40 ℃, carrying out constant-temperature treatment, and transferring the liquid to a freeze dryer to ensure complete drying, thereby obtaining the natural polysaccharide sponge keeping fuchsin sodium sulfite aggregation. Pressing the sponge body under the pressure of 30Mpa to obtain the portable methanol color test paper. And preparing a mixed system with the mass ratio of ethanol to methanol being 100:10, and developing by using test paper.
Fig. 2 shows the microscopic cross-sectional morphology (2000 times) of the portable methanol color test paper in example 2, and it can be seen more clearly that the circled area is a fuchsin aggregation area under high magnification, and the fuchsin aggregation area is better protected in the fiber thin layer due to the increased concentration of guar gum, so as to achieve the purpose of preventing oxidation.
Example 3
Ground basic fuchsin was weighed and dissolved in 10% aqueous sodium stearate at 25 ℃. The mass ratio of the sodium stearate aqueous solution to the basic fuchsin is 100: 3. Fuchsin aggregates in micelles formed by sodium stearate at room temperature to obtain an aqueous solution of aggregated fuchsin in sodium stearate. Preparing xanthan gum aqueous solution with the concentration of 1.0%, and standing and swelling for later use after the preparation is finished. In the aqueous solution of xanthan gum, an aqueous solution of sodium stearate of aggregated fuchsin was added to ensure that the mass ratio of the aqueous solution of xanthan gum to the aqueous solution of sodium stearate of aggregated fuchsin was 100:30, to obtain an aqueous solution of fuchsin aggregated xanthan gum. A 10% aqueous sodium sulfite solution was then added to ensure a 100:5 mass ratio of the aqueous magenta aggregated xanthan gum solution to the aqueous sodium sulfite solution. And pouring the finally obtained liquid into a mold, transferring the liquid to a cold trap, cooling to-40 ℃, carrying out constant-temperature treatment, and transferring the liquid to a freeze dryer to ensure complete drying, thereby obtaining the natural polysaccharide sponge keeping fuchsin sodium sulfite aggregation. Pressing the sponge body under the pressure of 30Mpa to obtain the portable methanol color test paper. And preparing a mixed system with the mass ratio of ethanol to methanol being 100:10, and developing by using test paper.
Example 4
Ground basic fuchsin was weighed and dissolved in 10% aqueous sodium stearate at 25 ℃. The mass ratio of the sodium stearate aqueous solution to the basic fuchsin is 100: 10. Fuchsin aggregates in micelles formed by sodium stearate at room temperature to obtain an aqueous solution of aggregated fuchsin in sodium stearate. Preparing xanthan gum aqueous solution with the concentration of 0.8%, and standing and swelling for later use after the preparation is finished. Adding aqueous solution of sodium stearate of aggregated fuchsin into aqueous solution of xanthan gum, and ensuring that the mass ratio of the aqueous solution of xanthan gum to the aqueous solution of sodium stearate of aggregated fuchsin is 100:10 to obtain aqueous solution of fuchsin aggregated xanthan gum. A 10% aqueous sodium sulfite solution was then added to ensure a 100:5 mass ratio of the aqueous magenta aggregated xanthan gum solution to the aqueous sodium sulfite solution. And pouring the finally obtained liquid into a mold, transferring the liquid to a cold trap, cooling to-40 ℃, carrying out constant-temperature treatment, and transferring the liquid to a freeze dryer to ensure complete drying, thereby obtaining the natural polysaccharide sponge keeping fuchsin sodium sulfite aggregation. Pressing the sponge body under the pressure of 30Mpa to obtain the portable methanol color test paper. And preparing a mixed system with the mass ratio of ethanol to methanol being 100:10, and developing by using test paper.
Example 5
Ground basic fuchsin was weighed and dissolved in 10% aqueous sodium stearate at 25 ℃. The mass ratio of the sodium stearate aqueous solution to the basic fuchsin is 100: 8. Fuchsin aggregates in micelles formed by sodium stearate at room temperature to obtain an aqueous solution of aggregated fuchsin in sodium stearate. Preparing a carboxymethyl cellulose aqueous solution with the concentration of 1.5%, and standing and swelling for later use after the preparation is finished. Adding aqueous solution of sodium stearate of aggregated fuchsin into aqueous solution of carboxymethyl cellulose, and ensuring that the mass ratio of the aqueous solution of carboxymethyl cellulose to the aqueous solution of sodium stearate of aggregated fuchsin is 100:30 to obtain aqueous solution of fuchsin aggregated carboxymethyl cellulose. Subsequently, a 10% aqueous sodium sulfite solution was added to ensure a mass ratio of the magenta aggregation-type aqueous carboxymethyl cellulose solution to the aqueous sodium sulfite solution of 100: 1. And pouring the finally obtained liquid into a mold, transferring the liquid to a cold trap, cooling to-40 ℃, carrying out constant-temperature treatment, and transferring the liquid to a freeze dryer to ensure complete drying, thereby obtaining the natural polysaccharide sponge keeping fuchsin sodium sulfite aggregation. Pressing the sponge body under the pressure of 30Mpa to obtain the portable methanol color test paper. And preparing a mixed system with the mass ratio of ethanol to methanol being 100:10, and developing by using test paper.
Example 6
Ground basic fuchsin was weighed and dissolved in 10% aqueous sodium stearate at 25 ℃. The mass ratio of the sodium stearate aqueous solution to the basic fuchsin is 100: 1. Fuchsin aggregates in micelles formed by sodium stearate at room temperature to obtain an aqueous solution of aggregated fuchsin in sodium stearate. Preparing xanthan gum aqueous solution with the concentration of 0.5%, and standing and swelling for later use after the preparation is finished. Adding aqueous solution of sodium stearate of aggregated fuchsin into aqueous solution of xanthan gum, and ensuring that the mass ratio of the aqueous solution of xanthan gum to the aqueous solution of sodium stearate of aggregated fuchsin is 100:10 to obtain aqueous solution of fuchsin aggregated xanthan gum. A 10% aqueous sodium sulfite solution was then added to ensure a 100:10 mass ratio of the aqueous magenta aggregated xanthan gum solution to the aqueous sodium sulfite solution. And pouring the finally obtained liquid into a mold, transferring the liquid to a cold trap, cooling to-50 ℃, carrying out constant-temperature treatment, and transferring the liquid to a freeze dryer to ensure complete drying, thereby obtaining the natural polysaccharide sponge keeping fuchsin sodium sulfite aggregation. Pressing the sponge body under the pressure of 25Mpa to obtain the portable methanol color test paper. And preparing a mixed system with the mass ratio of ethanol to methanol being 100:10, and developing by using test paper.
Example 7
Ground basic fuchsin was weighed and dissolved in 10% aqueous sodium stearate at 25 ℃. The mass ratio of the sodium stearate aqueous solution to the basic fuchsin is 100: 8. Fuchsin aggregates in micelles formed by sodium stearate at room temperature to obtain an aqueous solution of aggregated fuchsin in sodium stearate. Preparing xanthan gum aqueous solution with the concentration of 2%, and standing and swelling for later use after the preparation is finished. Adding aqueous solution of sodium stearate of aggregated fuchsin into aqueous solution of xanthan gum, and ensuring that the mass ratio of the aqueous solution of xanthan gum to the aqueous solution of sodium stearate of aggregated fuchsin is 100:20 to obtain aqueous solution of fuchsin aggregated xanthan gum. A 10% aqueous sodium sulfite solution was then added to ensure a 100:8 mass ratio of the aqueous magenta aggregated xanthan gum solution to the aqueous sodium sulfite solution. And pouring the finally obtained liquid into a mold, transferring the liquid to a cold trap, cooling to-30 ℃, carrying out constant-temperature treatment, and transferring the liquid to a freeze dryer to ensure complete drying, thereby obtaining the natural polysaccharide sponge keeping fuchsin sodium sulfite aggregation. Pressing the sponge body under the pressure of 35Mpa to obtain the portable methanol color test paper. And preparing a mixed system with the mass ratio of ethanol to methanol being 100:10, and developing by using test paper.
Example 8
Ground basic fuchsin was weighed and dissolved in 10% aqueous sodium stearate at 25 ℃. The mass ratio of the sodium stearate aqueous solution to the basic fuchsin is 100: 6. Fuchsin aggregates in micelles formed by sodium stearate at room temperature to obtain an aqueous solution of aggregated fuchsin in sodium stearate. Preparing a carboxymethyl cellulose aqueous solution with the concentration of 2%, and standing and swelling for later use after the preparation is finished. Adding aqueous solution of sodium stearate of aggregated fuchsin into aqueous solution of carboxymethyl cellulose, and ensuring that the mass ratio of the aqueous solution of carboxymethyl cellulose to the aqueous solution of sodium stearate of aggregated fuchsin is 100:30 to obtain aqueous solution of fuchsin aggregated carboxymethyl cellulose. Then, a 10% aqueous sodium sulfite solution was added to ensure a mass ratio of the magenta aggregation-type aqueous carboxymethyl cellulose solution to the aqueous sodium sulfite solution of 100: 4. And pouring the finally obtained liquid into a mold, transferring the liquid to a cold trap, cooling to-45 ℃, carrying out constant-temperature treatment, and transferring the liquid to a freeze dryer to ensure complete drying, thereby obtaining the natural polysaccharide sponge keeping fuchsin sodium sulfite aggregation. Pressing the sponge body under the pressure of 28Mpa to obtain the portable methanol color test paper. And preparing a mixed system with the mass ratio of ethanol to methanol being 100:10, and developing by using test paper.
The foregoing is a more detailed description of the invention and it is not intended that the invention be limited to the specific embodiments described herein, but that various modifications, alterations, and substitutions may be made by those skilled in the art without departing from the spirit of the invention, which should be construed to fall within the scope of the invention as defined by the appended claims.
Claims (5)
1. A preparation method of portable methanol color test paper is characterized by comprising the following steps:
aggregating fuchsin in sodium stearate micelles to obtain an aqueous solution of aggregated fuchsin sodium stearate;
preparing a natural polysaccharide aqueous solution, standing and swelling for later use after the preparation is finished;
adding aqueous solution of sodium stearate of aggregated fuchsin into the natural polysaccharide aqueous solution to obtain aqueous solution of fuchsin aggregated polysaccharide;
adding a sodium sulfite aqueous solution into a fuchsin aggregation type polysaccharide aqueous solution to obtain a mixed solution;
pouring the mixed solution into a mold, transferring the mold to a cold trap, carrying out constant temperature treatment, freeze-drying, and completely drying to obtain a natural polysaccharide sponge keeping fuchsin sodium sulfite aggregation;
drying and pressing the natural polysaccharide cavernous body keeping fuchsin sodium sulfite aggregation to obtain portable methanol color development test paper;
the natural polysaccharide is guar gum, carboxymethyl guar gum, xanthan gum, sesbania gum or carboxymethyl cellulose, and the concentration of the natural polysaccharide aqueous solution is 0.5-2%;
the specific preparation method of the aqueous solution of sodium stearate of the poly-fuchsin comprises the following steps:
weighing ground basic fuchsin, and dissolving in sodium stearate water solution; the mass ratio of the sodium stearate aqueous solution to the basic fuchsin is 100 (1-10); gathering fuchsin in micelles formed by sodium stearate at normal temperature to obtain a sodium stearate aqueous solution of gathered fuchsin;
the mass ratio of the natural polysaccharide aqueous solution to the sodium stearate aqueous solution of the poly-fuchsin is 100 (10-30).
2. The method for preparing the portable methanol color test paper according to claim 1, wherein the mass ratio of the fuchsin aggregated polysaccharide aqueous solution to the sodium sulfite aqueous solution is 100 (1-10).
3. The preparation method of the portable methanol color test paper according to claim 1, wherein the temperature of the cold trap is-50 to-30 ℃, and the temperature is kept constant for 4 to 6 hours; and adjusting the pressure in the freeze dryer to 5-10Pa, and keeping the pressure for 20-26 h.
4. The method for preparing the portable methanol color test paper according to claim 1, wherein the drying and pressing are performed at a temperature of 100 to 110 ℃ and a pressure of 25 to 35 MPa.
5. A portable methanol color development test paper is characterized in that: the methanol color test paper is prepared by the method of any one of claims 1 to 4.
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Citations (6)
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| US4657739A (en) * | 1983-03-17 | 1987-04-14 | Fuji Photo Film Co., Ltd. | Integral element for biological reaction and process for the preparation thereof |
| US4861552A (en) * | 1982-12-03 | 1989-08-29 | Fuji Photo Film Co., Ltd. | Biological reaction layer and its preparation |
| US5246664A (en) * | 1989-08-10 | 1993-09-21 | Dai Nippon Insatsu Kabushiki Kaisha | Water-disintegrable material and device for assaying a body fluid |
| CN1256421A (en) * | 1999-12-01 | 2000-06-14 | 罗学刚 | Formaldehyde and methanol content testing paper and liquid and relevant test method |
| CN102279182A (en) * | 2011-05-12 | 2011-12-14 | 大连理工大学 | Preparation method of detection membrane for iron pollution on surface of austenitic stainless steel |
| CN107515215A (en) * | 2017-08-31 | 2017-12-26 | 赵东育 | A kind of air, formaldehyde in aqueous solution detection gel |
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2019
- 2019-07-22 CN CN201910662092.2A patent/CN110274901B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4861552A (en) * | 1982-12-03 | 1989-08-29 | Fuji Photo Film Co., Ltd. | Biological reaction layer and its preparation |
| US4657739A (en) * | 1983-03-17 | 1987-04-14 | Fuji Photo Film Co., Ltd. | Integral element for biological reaction and process for the preparation thereof |
| US5246664A (en) * | 1989-08-10 | 1993-09-21 | Dai Nippon Insatsu Kabushiki Kaisha | Water-disintegrable material and device for assaying a body fluid |
| CN1256421A (en) * | 1999-12-01 | 2000-06-14 | 罗学刚 | Formaldehyde and methanol content testing paper and liquid and relevant test method |
| CN102279182A (en) * | 2011-05-12 | 2011-12-14 | 大连理工大学 | Preparation method of detection membrane for iron pollution on surface of austenitic stainless steel |
| CN107515215A (en) * | 2017-08-31 | 2017-12-26 | 赵东育 | A kind of air, formaldehyde in aqueous solution detection gel |
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