Test paper for measuring content of chlorine dioxide and preparation method thereof

[0042]Weigh 2.40g sodium dihydrogen phosphate monohydrate, 0.66g disodium hydrogen phosphate dihydrate, 0.34g disodium EDTA and 0.001g sodium metabisulfite, add 100mL pure water, stir until the solids are all dissolved, and obtain the auxiliary material solution, and soak the qualitative filter paper in the auxiliary material solution, take out the filter paper after 10 seconds, and place it in an oven to dry at 80°C for 30 minutes to prepare a test paper base layer with no reaction substrate. Prepare 3,3',5,5'-tetramethylbenzidine solution with absolute ethanol. Weigh 0.05g of 3,3',5,5'-tetramethylbenzidine into a beaker, add 100mL of absolute ethanol, and stir until the solid powder is completely dissolved to obtain a detection reactant solution. Immerse the base layer of the test paper prepared above without the reaction substrate into the detection reactant solution, take out the filter paper after 10 seconds, and let it dry in the air. Cut the dried filter paper into strips

[0045] Weigh 2.40g of sodium dihydrogen phosphate monohydrate, 0.66g of disodium hydrogen phosphate dihydrate, 0.34g of disodium EDTA and 0.003g of sodium metabisulfite, add 100mL of pure water, stir until all the solids are dissolved, and obtain the auxiliary material solution, and soak the qualitative filter paper in the auxiliary material solution, take out the filter paper after 10 seconds, and place it in an oven to dry at 80°C for 30 minutes to prepare a test paper base layer with no reaction substrate. Prepare 3,3',5,5'-tetramethylbenzidine solution with absolute ethanol. Weigh 0.1g of 3,3',5,5'-tetramethylbenzidine into a beaker, add 100mL of absolute ethanol, and stir until the solid powder is completely dissolved to obtain a detection reactant solution. Immerse the base layer of the test paper prepared above without the reaction substrate into the detection reactant solution, take out the filter paper after 10 seconds, and let it dry in the air. Cut the dried filter pa

[0048] Weigh 2.40g sodium dihydrogen phosphate monohydrate, 0.66g disodium hydrogen phosphate dihydrate, 0.34g disodium EDTA and 0.005g sodium metabisulfite, add 100mL pure water, stir until the solids are all dissolved, and obtain the auxiliary material solution, and soak the qualitative filter paper in the auxiliary material solution, take out the filter paper after 10 seconds, and place it in an oven to dry at 80°C for 30 minutes to prepare a test paper base layer with no reaction substrate. Prepare 3,3',5,5'-tetramethylbenzidine solution with absolute ethanol. Weigh 0.2g of 3,3',5,5'-tetramethylbenzidine into a beaker, add 100mL of absolute ethanol, stir until the solid powder is completely dissolved, and obtain a detection reactant solution. Immerse the base layer of the test paper prepared above without the reaction substrate into the detection reactant solution, take out the filter paper after 10 seconds, and let it dry in the air. Cut the dried filter paper into strips o