Iodine detection indicator card and application thereof

Abstract

The present invention discloses an iodine detection indicator card and its application, belonging to the technical field of gaseous iodine detection. The iodine detection indicator card is prepared by adding an iodine detection indicator into a carrier, mixing the iodine detection indicator evenly, and then scraping the iodine detection indicator onto a clean glass to form a detection indicator card; the carrier is a polymer, a resin, or paper; the iodine detection indicator is obtained by heating sulfur powder and stannous chloride powder in diethylenetriamine. The iodine detection indicator card of the present invention has different degrees of color change effect at different iodine vapor concentrations, can identify iodine vapor in different concentration ranges, and has a fast response during detection, changing color when encountering iodine, does not require complicated operation steps and professional skills, is easy to carry and use, is suitable for rapid on-site detection, and is more affordable and has a lower cost when a large number of test samples are required.

Description

Technical Field

[0001] The invention belongs to the technical field of gaseous iodine detection, and in particular relates to an iodine detection indicator card and an application thereof in detecting iodine content in gas. Background Art

[0002] With the continuous development of nuclear power, the reserves of spent nuclear fuel are also increasing. Spent fuel contains unfissioned uranium-235, which needs to be recycled and reused. In this process (i.e., spent fuel reprocessing), a large amount of gaseous radioactive iodine will be produced. Compared with solid radioactive waste, gaseous radioactive iodine has the characteristics of high fluidity and easy migration, which leads to a larger pollution area and is more likely to cause serious harm to the ecological environment and human health. After being ingested by the human body, radioactive iodine will accumulate in the thyroid gland, interfere with normal thyroid function, and may even induce thyroid cancer. Long-term exposure to radioactive iodine will also affect the hematopoietic system, reduce the body's immunity, and increase the risk of infection.

[0003] Detecting gaseous radioactive iodine is the key to timely warning, risk assessment and taking countermeasures. At present, the main methods for detecting gaseous radioactive iodine are fluorescence photometry, electrochemistry and ion chromatography. When measuring the content of gaseous iodine, fluorescence photometry and electrochemistry are easily interfered by the outside world and other substances, such as temperature changes, light effects, oxidizing substances, reducing substances, etc., which lead to measurement errors. In addition, as high-precision instruments, fluorescence photometers and electrochemical analyzers have high maintenance costs and require regular maintenance and calibration. The repair cost is also high when a failure occurs. Although ion chromatography has high accuracy in measuring the content of gaseous iodine, the operation is relatively complicated and the equipment cost is high. Ion chromatography has high requirements for the pretreatment of gaseous iodine samples and personnel detection technology during detection. The basic professional quality of the detection personnel has a great influence on the accuracy of the measurement results.

[0004] The indicator method is simple and quick to operate, does not require complex equipment, is low-cost, and is suitable for rapid on-site detection. At the same time, the indicator directly reflects the presence of iodine through color changes, and the results are intuitive and easy to understand, which lowers the threshold for use. Although the indicator method for detecting iodine is significantly superior to fluorescence spectrophotometry, electrochemical method, and ion chromatography in terms of convenience, cost-effectiveness, and intuitive results, it is a simpler and faster detection method. However, the gas-phase iodine detection methods currently on the market tend to use instruments and equipment to detect iodine, and there is a huge gap in the field of gas-phase iodine indicator detection. Summary of the invention

[0005] The purpose of the present invention is to provide a simple, fast and cheap iodine detection indicator card to address the deficiencies in the above-mentioned gas phase iodine detection technology, and to quickly detect the iodine content in the gas so as to timely discover and warn and avoid harm to the human body.

[0006] The detection indicator provided by the invention is formed by adding an iodine detection indicator into a carrier, fully mixing the mixture, coating the mixture on a clean glass, and molding the mixture; the carrier is any one of a polymer, a resin, and a paper.

[0007] The preparation method of the iodine detection indicator is as follows: add sulfur powder to diethylenetriamine, heat and stir at 50-80°C until the sulfur powder is completely dissolved, cool to room temperature, add stannous chloride powder, stir and react at 90-150°C for 4-8 hours to obtain the iodine detection indicator.

[0008] In the method for preparing the iodine detection indicator, the mass ratio of the sulfur powder to diethylenetriamine and stannous chloride powder is preferably 1:6-9:1-2.2.

[0009] In the method for preparing the iodine detection indicator, the reaction is preferably stirred at 110 to 120° C. for 5 to 6 hours.

[0010] When the above-mentioned carrier is a polymer, the polymer is dissolved in a solvent, and the iodine detection indicator is added thereto, the volume ratio of the iodine detection indicator to the polymer is 1:2-5, and the mixture is fully stirred and evenly mixed at 20-120°C, and then applied on a clean glass. The resulting polymer film after curing is the iodine detection indicator card. Wherein, the polymer is any one of polyethersulfone and polylactic acid, the polyethersulfone is dissolved in N,N-dimethylformamide, and the polylactic acid is dissolved in ethanol.

[0011] When the carrier is a resin, the iodine detection indicator is added to the resin, the volume ratio of the iodine detection indicator to the resin is 1:2-5, and the mixture is fully stirred and evenly applied to a clean glass, and pressed with another piece of glass, and peeled off after solidification. The resulting film is an iodine detection indicator card. The resin is a mixture of any one or more of epoxy resin, acrylic resin, and silicone grease.

[0012] When the carrier is paper, take paper pulp, add the iodine detection indicator thereto, the volume ratio of the iodine detection indicator to paper pulp is 1:2-5, stir at 20-60°C for 5-6 hours, then apply the paper pulp on clean glass, and the obtained paper after drying is the iodine detection indicator card.

[0013] The invention also provides application of the iodine detection indicator card in detecting iodine content in gas.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The iodine detection indicator card provided by the present invention only needs to be placed in the gas sample to be tested, and then the color change of the indicator card is observed. No complicated operation steps and professional skills are required, and it is suitable for rapid on-site detection.

[0016] 2. The iodine detection indicator card provided by the present invention is compact and portable, and can be used for detection in situations where space is limited or instruments cannot be used. At the same time, because the indicator card is easy to carry and use, detection can be carried out anytime and anywhere.

[0017] 3. The iodine detection indicator card provided by the present invention is low in cost and easy to store, and does not require professional operators and maintenance costs compared to instrument detection. In the case where a large number of test samples are required, it is more affordable and has a lower cost.

[0018] 4. The iodine detection indicator card provided by the present invention has different degrees of color change effect under different iodine vapor concentrations, can identify iodine vapor in different concentration ranges, and has the effect of assisting in the determination of iodine vapor concentration.

[0019] 5. The iodine detection indicator card provided by the present invention has a fast response during detection and changes color when encountering iodine. The indicator card can respond in a short time when placed in the environment to be tested, and the detection result can be obtained by corresponding to the colorimetric card. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the finished product of the iodine detection indicator card with a polymer base in Example 1.

[0021] Figure 2 The following are the color changes of the polymer-based iodine detection indicator card in Example 1 after being left to stand in iodine vapor of different concentrations.

[0022] Figure 3 This is the finished product of the iodine detection indicator card with a paper base in Example 2.

[0023] Figure 4 The iodine detection indicator card with a paper base in Example 2 changes color after being placed in iodine vapor of different concentrations.

[0024] Figure 5 This is the finished product of the iodine detection indicator card with a resin base in Example 3.

[0025] Figure 6 The following are the color changes of the iodine detection indicator card with a resin base in Example 3 after being left to stand in iodine vapor of different concentrations. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but these embodiments should be understood as being only used to illustrate the present invention and not to limit the scope of protection of the present invention. After reading the contents recorded in the present invention, various changes or modifications made to the present invention based on the principles of the present invention also fall within the scope defined by the claims of the present invention.

[0027] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods, and the materials, reagents, etc. used are all available from commercial sources unless otherwise specified. Example 1

[0028] Take 60g of diethylenetriamine and heat it to 70℃, slowly add 7.7g of sulfur powder, heat and stir at 70℃ until the sulfur powder is completely dissolved, then cool naturally to room temperature, slowly add 12.4g of stannous chloride powder to the resulting solution, stir and react for 6 hours under 120℃ oil bath heating to obtain an iodine detection indicator. Take 45mL of PES particles (polyethersulfone), heat and dissolve them in 100mL of N,N-dimethylformamide (DMF) at 90℃, stir and mix evenly, then slowly add 20mL of iodine detection indicator under 90℃ heating and stirring conditions, continue heating and stirring at 90℃ for 1 hour after adding, and obtain a suspension without precipitation and large particle aggregation; apply the resulting suspension on a clean glass surface, peel off the polymer film after natural drying to obtain an iodine detection indicator card based on PES.

[0029] Depend on Figure 1 It can be seen that the iodine detection indicator card with a PES base prepared in this embodiment is white as a whole. Figure 2 The color change of the iodine detection indicator card based on PES after being placed in different concentrations of iodine vapor for 20 minutes, from left to right, 0, 200, 400, 800, 1600 ppm. It can be observed that the detection indicator card based on PES is milky white in the absence of iodine. When the iodine concentration is 200 ppm, the color of the iodine detection indicator card begins to turn yellow but is not obvious. At 400 ppm, there is a more obvious color change. After that, the color gradually becomes darker as the iodine vapor concentration increases. At 1600 ppm, the color of the iodine detection indicator card turns brown. Example 2

[0030] Take 60g of diethylenetriamine and heat it to 70℃, slowly add 7g of sulfur powder, heat and stir at 70℃ until the sulfur powder is completely dissolved, then cool naturally to room temperature, slowly add 12g of stannous chloride powder to the resulting solution, stir and react for 6 hours under heating in an oil bath at 120℃ to obtain an iodine detection indicator. Take 20mL of paper pulp, then add 6mL of iodine detection indicator, heat and stir at 50℃ for 6 hours, scrape and apply on a clean glass plate, then dry in an oven at 60℃ for 12 hours, and peel off to obtain an iodine detection indicator card with a paper base.

[0031] Figure 3 The iodine detection indicator card with a paper base prepared in this embodiment is slightly yellowish, soft and relatively flat. Figure 4The color change of the iodine detection indicator card with a paper substrate after standing for 20 minutes under different concentrations of iodine vapor, from left to right, respectively 0, 200, 400, 800, 1600ppm. It can be observed that the iodine detection indicator card with a paper substrate is light yellow in the absence of iodine. When the iodine concentration is 200ppm, the yellow color on the surface of the iodine detection indicator card begins to deepen and slightly blacken. At 400ppm, the edge of the iodine detection indicator card is black, and the surface color is further aggravated. Afterwards, the color gradually increases with the increase in iodine vapor concentration, and the surface color of the iodine detection indicator card becomes darker and blacker at 1600ppm. Example 3

[0032] Take 60g of diethylenetriamine and heat it to 80℃, slowly add 9g of sulfur powder, heat and stir at 80℃ until the sulfur powder is completely dissolved, then cool naturally to room temperature, slowly add 11g of stannous chloride powder to the resulting solution, stir and react for 6 hours under 120℃ oil bath heating to obtain an iodine detection indicator. Take 5mL of epoxy resin A glue and B glue with a curing ratio of 1:1, mix them evenly to obtain epoxy resin glue; take 5mL of iodine detection indicator, add it to the epoxy resin glue, stir and mix evenly, let it stand for 2 minutes, then scrape it on a clean glass plate, take another clean glass plate and press it on it, and let it stand for 6 hours to obtain an iodine detection indicator card based on epoxy resin. Figure 5 The epoxy resin-based iodine detection indicator card prepared in this embodiment is light yellow in color, translucent, and tough. Figure 6 The color changes of the iodine detection indicator card with epoxy resin base after being placed in different concentrations of iodine vapor for 10 minutes, from left to right are 0, 100, 200, 400, 600, 1200, 2000ppm. It can be observed that when the iodine concentration is 100ppm, the color of the iodine detection indicator card changes to a lighter color, and at 200ppm, there is a more obvious color change, and then the color gradually becomes darker with the increase of iodine vapor concentration. At 1200ppm, the color of the iodine detection indicator card becomes dark purple, and at 2000ppm, the color completely turns black.

Claims

1. An iodine detection indicator card, characterized in that: The iodine detection indicator is added to the carrier, mixed thoroughly and evenly, and then applied on clean glass to form the iodine detection indicator card after molding; the carrier is any one of polymer, resin, and paper; The preparation method of the iodine detection indicator is as follows: adding sulfur powder to diethylenetriamine, heating and stirring at 50-80° C. until the sulfur powder is completely dissolved, cooling to room temperature, adding stannous chloride powder, stirring and reacting at 90-150° C. for 4-8 hours, and obtaining the iodine detection indicator; The mass ratio of the sulfur powder to diethylenetriamine and stannous chloride powder is 1:6-9:1-2.

2.

2. The iodine detection indicator card according to claim 1, characterized in that: In the preparation method of the iodine detection indicator, the reaction is stirred at 110-120° C. for 5-6 hours.

3. The iodine detection indicator card according to claim 1, characterized in that: When the carrier is a polymer, the polymer is dissolved in a solvent, and the iodine detection indicator is added thereto, the volume ratio of the iodine detection indicator to the polymer is 1:2-5, and the mixture is fully stirred and mixed at 20-120°C and then applied on a clean glass. The resulting polymer film after curing is the iodine detection indicator card.

4. The iodine detection indicator card according to claim 1 or 3, characterized in that: The polymer is any one of polyethersulfone and polylactic acid.

5. The iodine detection indicator card according to claim 4, characterized in that: The polyethersulfone is dissolved by N,N-dimethylformamide, and the polylactic acid is dissolved by ethanol.

6. The iodine detection indicator card according to claim 1, characterized in that: When the carrier is a resin, the iodine detection indicator is added to the resin, the volume ratio of the iodine detection indicator to the resin is 1:2-5, and after being fully stirred and mixed, it is applied on a clean glass, pressed with another piece of glass, and peeled off after it is solidified. The resulting film is the iodine detection indicator card.

7. The iodine detection indicator card according to claim 1 or 6, characterized in that: The resin is any one or more mixtures of epoxy resin, acrylic resin and silicone grease.

8. The iodine detection indicator card according to claim 1, characterized in that: When the carrier is paper, take paper pulp, add the iodine detection indicator thereto, the volume ratio of the iodine detection indicator to paper pulp is 1:2-5, stir at 20-60°C for 5-6 hours, then apply the paper pulp on clean glass, and the obtained paper after drying is the iodine detection indicator card.

9. Use of the iodine detection indicator card according to claim 1 in detecting iodine content in gas.

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