CN114354593B - Composite test paper for detecting leakage of hydrogen sulfide gas - Google Patents
Composite test paper for detecting leakage of hydrogen sulfide gas Download PDFInfo
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- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 80
- 239000007789 gas Substances 0.000 title claims abstract description 44
- 239000002131 composite material Substances 0.000 title claims abstract description 30
- 239000004410 anthocyanin Substances 0.000 claims abstract description 40
- 229930002877 anthocyanin Natural products 0.000 claims abstract description 40
- 235000010208 anthocyanin Nutrition 0.000 claims abstract description 40
- 150000004636 anthocyanins Chemical class 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000011159 matrix material Substances 0.000 claims abstract description 12
- 150000003841 chloride salts Chemical class 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 239000000123 paper Substances 0.000 claims description 79
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- 238000001035 drying Methods 0.000 claims description 11
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 11
- 241000196324 Embryophyta Species 0.000 claims description 10
- 229940087559 grape seed Drugs 0.000 claims description 9
- DAMJCWMGELCIMI-UHFFFAOYSA-N benzyl n-(2-oxopyrrolidin-3-yl)carbamate Chemical compound C=1C=CC=CC=1COC(=O)NC1CCNC1=O DAMJCWMGELCIMI-UHFFFAOYSA-N 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 5
- 235000011301 Brassica oleracea var capitata Nutrition 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 241000169546 Lycium ruthenicum Species 0.000 claims description 4
- OEYOHULQRFXULB-UHFFFAOYSA-N arsenic trichloride Chemical compound Cl[As](Cl)Cl OEYOHULQRFXULB-UHFFFAOYSA-N 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 3
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 3
- 244000178937 Brassica oleracea var. capitata Species 0.000 claims description 2
- 150000001804 chlorine Chemical class 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 11
- 238000001514 detection method Methods 0.000 abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 244000241838 Lycium barbarum Species 0.000 description 4
- 235000015459 Lycium barbarum Nutrition 0.000 description 4
- 238000005119 centrifugation Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
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- 101000937647 Drosophila melanogaster Probable malonyl-CoA-acyl carrier protein transacylase, mitochondrial Proteins 0.000 description 1
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- 229910021389 graphene Inorganic materials 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002114 nanocomposite Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
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- 229910000510 noble metal Inorganic materials 0.000 description 1
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention provides a material for detecting harmful gas, in particular to a composite test paper for detecting leakage of hydrogen sulfide gas, which can be used in the fields of petrochemical industry, natural gas chemical industry and coal chemical industry. The method is characterized in that the composite test paper comprises a matrix material, anthocyanin, chloride salt and other raw materials. The composite test paper can be used for qualitative or quantitative detection of hydrogen sulfide gas, and can achieve the technical effects of low cost, high sensitivity, visual, uniform color change, convenience in use and the like.
Description
Technical Field
The invention belongs to the technical field of gas detection, and particularly relates to a composite test paper for detecting leakage of hydrogen sulfide gas.
Background
Hydrogen sulfide is a irritating, choking and acidic highly toxic gas with a bad egg smell. When the concentration of hydrogen sulfide molecules in the air reaches 15ppm, the contactor loses consciousness, the apnea and olfactory system are deactivated, and when the human body inhales hydrogen sulfide with a concentration higher than 1000ppm, the contactor can die suddenly. In order to protect the safety of operation, detection of leakage of hydrogen sulfide gas is highly valued.
In recent years, studies on leakage of hydrogen sulfide gas have been conducted using nano materials such as noble metals and metal oxides, and graphene-based nano composite materials, which have not been commercially available on a large scale in a short period of time due to the cost and preparation process. The porous boron nitride, polyethylenimine, functionalized carbon nano-sheet and other metal-free sensors with lower cost need more severe reaction conditions, and are difficult to realize practical application in artificial operation environments.
In the invention patent (CN 202110488902.4) submitted by the previous subject group, aiming at the problem that the current detection technology cannot be applied in a large scale and full range, the hydrogen sulfide response material with the anti-corrosion function is prepared by utilizing the characteristic reaction of the anthocyanin and the hydrogen sulfide extracted naturally, and the hydrogen sulfide detection limit of the material is about 10ppm, so that the material can be used in the fields of petrochemical industry, natural gas chemical industry and coal chemical industry and has the technical effects of wide detection coverage, high sensitivity, visual perception, convenience in construction and the like. The material can be displayed in various forms, including a sheet shape, a sphere shape or a coating on the surface of equipment, and the diversity of the material meets the use conditions under different environments. Particularly can be combined with the gel material (CN 201610318230.1) of the prior invention, and the detection material with better corrosion resistance and color development performance can be obtained by utilizing the characteristics of high corrosion resistance, recycling and good compatibility of the gel material.
However, in the field of hydrogen sulfide leakage detection, technicians expect a more sensitive detection of hydrogen sulfide at a lower concentration, and are convenient and inexpensive to use.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the composite test paper for detecting the leakage of the hydrogen sulfide gas, which has the advantages of low cost, high sensitivity, visual, uniform color change and convenient use, and can detect the leakage of the hydrogen sulfide gas of 1 ppm.
The test paper is a convenient and low-cost detection material, such as acid-base test paper and biochemical test paper, and has been widely used. The invention provides a composite test paper for detecting leakage of hydrogen sulfide gas, which comprises the following raw materials: matrix material, anthocyanin and chloride.
Wherein:
The mass percentages of the matrix material, anthocyanin and chloride salt are respectively 90% -97%:2% -10%:0.1% -1%, preferably 90-94%:4-8%:0.3-0.7%, more preferably 90-92%:5-6%:0.4-0.6%, most preferably 92%:6%:0.5%.
The matrix material is paper pulp, and specifically comprises paper pulp such as copy paper, filter paper, white cardboard, packaging paper and the like. Filter paper pulp is preferred.
The anthocyanin is obtained by drying, centrifuging, extracting and purifying anthocyanin-containing plants.
The anthocyanin plants comprise lycium ruthenicum, red cabbage or grape seeds and other plants. Lycium ruthenicum are preferred.
Specifically, the drying method includes liquid nitrogen drying and freeze drying; the extraction comprises acidified water extraction and ultrasonic auxiliary extraction; the purification method is macroporous resin chromatography.
The acidified water is an aqueous acetic acid solution having a ph=4-6.
More specifically, anthocyanin-containing plants were placed in a liquid nitrogen dryer or freeze dryer. Soaking dried anthocyanin-containing plants in acidified water, ultrasonically extracting, centrifuging by a centrifuge, and collecting supernatant. And (3) carrying out macroporous resin chromatography on the supernatant to obtain anthocyanin.
More specifically, 500g of anthocyanin-containing plant is placed in a freeze dryer to be dried for 48 hours, 20g of dried anthocyanin-containing plant is soaked in 100ml of acidified water, then the acidified water mixture is placed in 30 ℃ and 1500W of ultrasonic waves to be extracted for 8 hours, the extract is placed in a centrifuge to be centrifuged at the speed of 4000r/min, and supernatant is obtained after centrifugation. Finally purifying the supernatant by macroporous resin chromatography to obtain anthocyanin.
The chloride salts include antimony trichloride, arsenic trichloride and silver chloride, preferably antimony trichloride.
The invention also provides a preparation method of the composite test paper for detecting hydrogen sulfide gas leakage, which comprises the following steps:
(1) And (3) placing the raw materials comprising the matrix material, anthocyanin and chloride in an ethanol-water solvent, stirring the mixed solution at a high speed, and obtaining the mixed solution after the reaction is completed.
(2) Pouring the mixture after the reaction into a mould, and curing and forming at room temperature to obtain the composite test paper for detecting hydrogen sulfide gas leakage.
Wherein the volume ratio of the ethanol to the water solvent is 1-3:2, preferably 1:1. The curing time is 12 to 24 hours, preferably 12 hours.
More specifically, the preparation method of the composite test paper for detecting hydrogen sulfide gas leakage comprises the following steps:
(1) Placing the matrix material, anthocyanin and chloride salt into an ethanol-water solvent with the volume ratio of 2:1-3, preferably 1:1, stirring the mixed solution at a high speed of 3000r/min, and stirring for 2 hours until the reaction is complete to obtain the mixed solution.
(2) Pouring the mixture after the reaction into a mould, and solidifying for 12-24 hours at room temperature to obtain the composite test paper for detecting hydrogen sulfide gas leakage.
The invention also provides a rapid determination method for quantitatively detecting hydrogen sulfide gas, which comprises the following steps:
The composite test paper for detecting the leakage of the hydrogen sulfide gas is placed in an environment possibly containing the hydrogen sulfide, and after the color of the test paper changes, the color displayed by the test paper is compared with a standard colorimetric card to obtain the concentration of the hydrogen sulfide.
The preparation method of the standard colorimetric card comprises the following steps:
(1) And placing the hydrogen sulfide color-changing test paper in hydrogen sulfide environments with different concentrations, and recording the color and RGB values of the test paper after the color of the test paper changes.
(2) A standard color chart and RGB value change table were prepared based on the known hydrogen sulfide concentration.
Technical effects
The composite test paper for detecting hydrogen sulfide gas leakage has the beneficial effects that:
1. The prepared test paper has extremely sensitive reaction with hydrogen sulfide and low detection limit, and can detect 1ppm of hydrogen sulfide. Compared with a standard color chart, the method can quickly, accurately and effectively obtain the concentration of the hydrogen sulfide gas in the current environment.
2. The test paper disclosed by the invention is uniform in color change, and the retention time after the color change is more than 48 hours, so that the test paper is favorable for observation, contrast and recheck inspection of detection personnel.
3. The freeze-dried anthocyanin adopted by the test paper has better oxidation resistance, and the prepared color-changing test paper has a dry storage shelf life of more than 12 months.
4. The test paper has the advantages of low manufacturing cost, simple manufacturing method and convenient use.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be illustrative of only some, but not all, of the examples.
Example 1
Drying 500g grape seed in a freeze dryer for 48h, soaking 20g dried grape seed in 100ml acidified water, extracting with 1500W ultrasonic at 30deg.C for 8h, centrifuging the extractive solution at 4000r/min, collecting supernatant, and purifying the supernatant by macroporous resin chromatography to obtain anthocyanin. And then 5 parts of anthocyanin and 92 parts of filter paper pulp are taken, 0.5 part of silver chloride is immersed in 15 parts of ethanol-water solvent with the volume ratio of 1:1, the mixture is stirred at a high speed of 3000r/min, after the mixture reacts for 2 hours, the mixture is put into a plastic mould with the volume of 50cm multiplied by 0.2cm, and the mixture is solidified for 12 hours at room temperature, so that the sheet test paper for detecting the leakage of the hydrogen sulfide gas is obtained. The test paper can be cut into different shapes for use.
The test paper was placed in an environment with a humidity of 50%, a temperature of 25 ℃ and a hydrogen sulfide concentration of 1ppm to simulate leakage of hydrogen sulfide, the time required for the surface of the test paper to change from light brown to orange red was 8s, and the test paper was compared with a standard color chart to obtain a hydrogen sulfide concentration of about 1ppm, and the surface color did not fade within 48 hours.
Example 2
Drying 500g of black matrimony vine in a freeze dryer for 48h, soaking 20g of dried black matrimony vine in 100ml of acidified water, extracting the acidified water in 1500W ultrasonic at 30 ℃ for 8h, centrifuging the extract in a centrifuge at 4000r/min, taking the supernatant after centrifugation, and purifying the supernatant by macroporous resin chromatography to obtain anthocyanin. Then 6 parts of anthocyanin and 92 parts of filter paper pulp are taken, 0.5 part of antimony trichloride is immersed in 20 parts of ethanol-water solvent with the volume ratio of 1:1, the mixture is stirred at a high speed of 3000r/min, after 2 hours of reaction, the mixed solution is put into a plastic mould with the volume of 50cm multiplied by 0.2cm, and the mixed solution is solidified at room temperature for 12 hours, so that the sheet test paper for detecting hydrogen sulfide gas leakage is obtained. The test paper can be cut into different shapes for use.
The test paper was placed in an environment with a humidity of 50%, a temperature of 25 ℃ and a hydrogen sulfide concentration of 1ppm to simulate leakage of hydrogen sulfide, the time required for the surface of the test paper to change from light purple to red was 5 seconds, and the test paper was compared with a standard color chart to obtain a hydrogen sulfide concentration of about 1ppm, and the surface color did not fade within 48 hours.
Example 3
Drying 500g grape seed in a freeze dryer for 48h, soaking 20g dried grape seed in 100ml acidified water, extracting with 1500W ultrasonic at 30deg.C for 8h, centrifuging the extractive solution at 4000r/min, collecting supernatant, and purifying the supernatant by macroporous resin chromatography to obtain anthocyanin. And then 6 parts of anthocyanin and 92 parts of filter paper pulp are taken, 0.5 part of arsenic trichloride is immersed into 20 parts of ethanol-water solvent with the volume ratio of 1:1, the mixture is stirred at a high speed of 3000r/min, after 2 hours of reaction, the mixed solution is put into a plastic mould with the volume of 50cm multiplied by 0.2cm, and the mixed solution is solidified at room temperature for 12 hours, so that the sheet test paper for detecting the leakage of the hydrogen sulfide gas is obtained. The test paper can be cut into different shapes for use.
The test paper is placed in an environment with the humidity of 50 percent, the temperature of 25 ℃ and the hydrogen sulfide concentration of 1ppm to simulate the leakage of hydrogen sulfide, the time required for the surface of the test paper to be changed from light yellow to orange red is 9 seconds, and the test paper is compared with a standard color card to obtain the hydrogen sulfide with the concentration of about 1ppm, and the surface color cannot fade within 48 hours.
Example 4
Drying 500g grape seed in a freeze dryer for 48h, soaking 20g dried grape seed in 100ml acidified water, extracting with 1500W ultrasonic at 30deg.C for 8h, centrifuging the extractive solution at 4000r/min, collecting supernatant, and purifying the supernatant by macroporous resin chromatography to obtain anthocyanin. Then 8 parts of modified anthocyanin and 90 parts of duplicating paper pulp are taken, 0.5 part of antimony trichloride is immersed in 15 parts of ethanol-water solvent with the volume ratio of 1:1, the mixture is stirred at a high speed of 3000r/min, after 2 hours of reaction, the mixed solution is put into a plastic mould with the volume ratio of 50cm multiplied by 0.2cm, and the mixed solution is solidified for 12 hours at room temperature, so that the sheet test paper for detecting hydrogen sulfide gas leakage is obtained. The test paper can be cut into different shapes for use.
The test paper was placed in an environment with a humidity of 50%, a temperature of 25 ℃ and a hydrogen sulfide concentration of 1ppm to simulate leakage of hydrogen sulfide, the time required for the surface of the test paper to change from pale yellow to orange red was 7s, and the test paper was compared with a standard color chart to obtain a hydrogen sulfide concentration of about 1ppm, and the surface color did not fade within 48 hours.
Example 5
Drying 500g of purple cabbage in liquid nitrogen for 1h, soaking 20g of dried purple cabbage in 100ml of acidified water, extracting the acidified water in 1500W ultrasonic at 30 ℃ for 8h, centrifuging the extract in a centrifuge at 4000r/min, collecting the supernatant after centrifugation, and purifying the supernatant by macroporous resin chromatography to obtain anthocyanin. Then 6 parts of anthocyanin and 92 parts of filter paper pulp are taken, 0.5 part of antimony trichloride is immersed in 20 parts of ethanol-water solvent with the volume ratio of 1:1, the mixture is stirred at a high speed of 3000r/min, after 2 hours of reaction, the mixed solution is put into a plastic mould with the volume of 50cm multiplied by 0.2cm, and the mixed solution is solidified at room temperature for 12 hours, so that the sheet test paper for detecting hydrogen sulfide gas leakage is obtained. The test paper can be cut into different shapes for use.
The test paper was placed in an environment with a humidity of 50%, a temperature of 25 ℃ and a hydrogen sulfide concentration of 1ppm to simulate leakage of hydrogen sulfide, the time required for the surface of the test paper to change from purple to orange-red was 9s, and the test paper was compared with a standard color chart to obtain a hydrogen sulfide concentration of about 1ppm, and the surface color did not fade within 48 hours.
Example 6
Drying 500g grape seed in a freeze dryer for 48h, soaking 20g dried grape seed in 100ml acidified water, extracting with 1500W ultrasonic at 30deg.C for 8h, centrifuging the extractive solution at 4000r/min, collecting supernatant, and purifying the supernatant by macroporous resin chromatography to obtain anthocyanin. And then 7 parts of anthocyanin and 94 parts of filter paper pulp are taken, 0.6 part of arsenic trichloride is immersed in 15 parts of ethanol-water solvent with the volume ratio of 1:1, the mixture is stirred at a high speed of 3000r/min, after 2 hours of reaction, the mixed solution is put into a plastic mould with the volume of 50cm multiplied by 0.2cm, and the mixed solution is solidified at room temperature for 15 hours, so that the sheet test paper for detecting hydrogen sulfide gas leakage is obtained. The test paper can be cut into different shapes for use.
The test paper was placed in an environment with a humidity of 50%, a temperature of 25 ℃ and a hydrogen sulfide concentration of 1ppm to simulate leakage of hydrogen sulfide, the time required for the surface of the test paper to change from light brown to orange red was 7s, and the test paper was compared with a standard color chart to obtain a hydrogen sulfide concentration of about 1ppm, and the surface color did not fade within 48 hours.
Example 7
Drying 500g of black matrimony vine in a freeze dryer for 48h, soaking 20g of dried black matrimony vine in 100ml of acidified water, extracting the acidified water in 1500W ultrasonic at 30 ℃ for 8h, centrifuging the extract in a centrifuge at 4000r/min, taking the supernatant after centrifugation, and purifying the supernatant by macroporous resin chromatography to obtain anthocyanin. Then 6 parts of anthocyanin and 92 parts of filter paper pulp are taken, 0.6 part of antimony trichloride is immersed in 15 parts of ethanol-water solvent with the volume ratio of 3:2, the mixture is stirred at a high speed of 3000r/min, after 2 hours of reaction, the mixed solution is put into a plastic mould with the volume of 50cm multiplied by 0.2cm, and the mixed solution is solidified at room temperature for 15 hours, so that the sheet test paper for detecting hydrogen sulfide gas leakage is obtained. The test paper can be cut into different shapes for use.
The test paper was placed in an environment with a humidity of 50%, a temperature of 25 ℃ and a hydrogen sulfide concentration of 1ppm to simulate leakage of hydrogen sulfide, the time required for the surface of the test paper to change from light brown to orange red was 5s, and the test paper was compared with a standard color chart to obtain a hydrogen sulfide concentration of about 1ppm, and the surface color did not fade within 48 hours.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (15)
1. The composite test paper for detecting hydrogen sulfide gas leakage is characterized by being prepared from raw materials comprising a matrix material, anthocyanin and chloride salt; the chloride salt comprises antimony trichloride, arsenic trichloride or silver chloride.
2. The composite test paper for detecting leakage of hydrogen sulfide gas according to claim 1, wherein the base material is pulp including copy paper pulp, filter paper pulp, white cardboard pulp or wrapping paper pulp.
3. A composite test paper for detecting leakage of hydrogen sulfide gas as claimed in claim 2, wherein the pulp is filter paper pulp.
4. The composite test paper for detecting leakage of hydrogen sulfide gas according to claim 1, wherein the mass percentages of the matrix material, anthocyanin and chloride salt are respectively 90% -97%, 2% -10% and 0.1% -1%.
5. The composite test paper for detecting leakage of hydrogen sulfide gas according to claim 4, wherein the mass percentages of the matrix material, anthocyanin and chloride salt are respectively 90-94%, 4-8% and 0.3-0.7%.
6. The composite test paper for detecting leakage of hydrogen sulfide gas according to claim 5, wherein the mass percentages of the matrix material, anthocyanin and chloride salt are respectively 90-92%, 5-6% and 0.4-0.6%.
7. The composite test paper for detecting leakage of hydrogen sulfide gas according to claim 6, wherein the mass percentages of the matrix material, anthocyanin and chloride salt are 92%, 6% and 0.5%, respectively.
8. The composite test paper for detecting leakage of hydrogen sulfide gas according to claim 1, wherein the anthocyanin is obtained by drying, centrifuging, extracting and purifying anthocyanin-containing plants.
9. The composite test strip for detecting hydrogen sulfide gas leakage according to claim 8, wherein said anthocyanin-containing plant comprises lycium ruthenicum, red cabbage or grape seed.
10. The composite test paper for detecting leakage of hydrogen sulfide gas according to claim 9, wherein said anthocyanin-containing plant is lycium ruthenicum.
11. A composite test paper for detecting leakage of hydrogen sulfide gas as claimed in claim 1, wherein said chlorine salt is antimony trichloride.
12. The method for preparing a composite test paper for detecting leakage of hydrogen sulfide gas according to claim 1, wherein the preparation method comprises the following steps:
(1) Placing the raw materials comprising the matrix material, anthocyanin and chloride in an ethanol-water solvent, stirring the mixed solution at a high speed, and obtaining the mixed solution after the reaction is completed;
(2) Pouring the mixture after the reaction into a mould, and curing and forming at room temperature to obtain the composite test paper for detecting hydrogen sulfide gas leakage.
13. The method for preparing a composite test paper for detecting leakage of hydrogen sulfide gas according to claim 12, wherein the volume ratio of the ethanol-water solvent is 1-3:2.
14. The method for preparing a composite test paper for detecting leakage of hydrogen sulfide gas according to claim 13, wherein the volume ratio of the ethanol to the water solvent is 1:1.
15. The rapid determination method for quantitatively detecting hydrogen sulfide gas is characterized by comprising the following steps of: the composite test paper for detecting leakage of hydrogen sulfide gas according to claim 1 is placed in an environment possibly containing hydrogen sulfide, and after the color of the test paper is changed, the color developed by the test paper is compared with a standard colorimetric card to obtain the concentration of the hydrogen sulfide.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4414839A (en) * | 1979-04-12 | 1983-11-15 | Board Of Trustees, A Constitutional Corporation Operating Michigan State University | Gas sensing apparatus and method |
| RU2234945C2 (en) * | 2002-10-15 | 2004-08-27 | Вардосанидзе Ирина Викторовна | Stabilizing agent for aqueous solution and water-containing raw with spontaneously varying oxidative-reductive properties |
| JP2005042221A (en) * | 2003-07-23 | 2005-02-17 | Kazuyoshi Okubo | Active oxygen free radical-eliminating agent containing silver-containing complex protein |
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