Iodometry-based method for measuring concentration of peroxide in peroxo-monosulfate, peroxo-disulfate and hydrogen peroxide mixed solution
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A technology of peroxodisulfate and hydrogen peroxide, which is applied in the direction of chemical analysis by titration, and can solve the problems of inability to measure the respective concentrations of the three oxidants
Active Publication Date: 2019-12-31
NORTHEAST AGRICULTURAL UNIVERSITY
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[0003] The purpose of the present invention is to solve the problem that the existing methods cannot measure the respective concentrations of the three oxidants in the three peroxide mixtures, and provide a method based on the iodometric method for determining the mixture of peroxymonosulfate, peroxodisulfate and hydrogen peroxide. The method for each concentration of peroxide in the solution
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specific Embodiment approach 1
[0016] The specific embodiment one: the present embodiment measures the method for each peroxide concentration in peroxomonosulfate, peroxodisulfate and hydrogen peroxide mixed solution based on iodometric method, according to the following steps:
[0017] 1. Take x mL of the solution to be tested, add sodium bicarbonate and potassium iodide, shake well, let it stand for 15-20min, add glacial acetic acid, shake well, and use a concentration of c 0 Titration of mol / L sodium thiosulfate solution, using starch as indicator, after titrating the solution to colorless, record the amount of sodium thiosulfate h 1 mL;
[0018] 2. Take another x mL of the solution to be tested, add sodium monohydrogen phosphate-sodium dihydrogen phosphate buffer solution, catalase solution, shake well, let it stand for 5-10min, add sodium bicarbonate and potassium iodide, shake well, let stand After 15-20min, add glacial acetic acid with a concentration of c 0 Titration of mol / L sodium thiosulfate...
specific Embodiment approach 2
[0023] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the concentration of potassium iodide in the test solution in step 1 and step 2 is ≥1.81mol / L, and the concentration of sodium bicarbonate is 0.79mmol / L. Others are the same as the first embodiment.
specific Embodiment approach 3
[0024] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the volume ratio of glacial acetic acid and the liquid to be tested is 3.3:(100-101) in step 1 and step 2. Others are the same as those in Embodiment 1 or 2.
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Abstract
The invention provides an iodometry-based method for measuring concentration of peroxide in a peroxo-monosulfate, peroxo-disulfate and hydrogen peroxide mixed solution, and relates to the iodometry-based method for measuring concentration of each peroxide in the peroxo-monosulfate, peroxo-disulfate and hydrogen peroxide mixed solution. The invention aims to solve the problem that respective concentration of three oxidizing agents in three oxidizing agent mixtures cannot be measured by an existing method. The iodometry-based method comprises the steps of adding a to-be-detected liquid into sodium bicarbonate and potassium iodide, adding acetic acid after standing, performing titration, and calculating to obtain concentration sum of the oxidizing agents; taking and adding the to-be-detectedliquid into disodium hydrogen-sodium dihydrogen phosphate buffer liquid and a catalase solution, adding the sodium bicarbonate and the potassium iodide, adding acetic acid after standing, and performing titration to obtain concentration sum of PMS and PDS; and taking the to-be-detected liquid, adding disodium hydrogen-sodium dihydrogen phosphate buffer liquid and the catalase solution, adding potassium iodide and an acetic acid-sodium acetate buffer liquid, performing titration after standing, and calculating to obtain concentration of the PMS. The iodometry-based method is applied to the field of oxidizing agent concentration measurement.
Description
technical field [0001] The invention relates to a method for measuring the concentration of each peroxide in a mixed solution of peroxymonosulfate, peroxodisulfate and hydrogen peroxide based on iodometric method. Background technique [0002] Peroxymonosulfate (PMS), peroxodisulfate (PDS) and hydrogen peroxide (H 2 o 2 ) as a strong oxidizing agent is widely used in drinking water and wastewater treatment. By activating the above three oxidizing agents, highly oxidizing sulfate radicals and / or hydroxyl radicals can be generated, thereby more effectively oxidizing and degrading organic pollutants. When peroxymonosulfate and peroxodisulfate technologies are used, two other peroxides may be generated in the system. And in the combined technology of persulfate (PMS / PDS) and hydrogen peroxide, persulfate and hydrogen peroxide will also exist at the same time. Therefore, it is particularly important to establish a convenient and quick method for determining the concentration ...
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