Evaluation screening method and evaluation operating process for chlorine-containing disinfectants

Abstract

The invention relates to an evaluation screening method and an evaluation operating process for chlorine-containing disinfectants. The evaluation screening method for chlorine-containing disinfectants comprises the following steps of: adding potassium iodide into a chlorine-containing disinfectant to be determined, so that the potassium iodide is oxidized and iodine is separated out; through taking starch as an indicator, carrying out titration by using a standard sodium thiosulfate solution; and calculating the initial chloride equivalent according to the consumption of the standard sodium thiosulfate solution. In the process of determining, the potassium iodide is directly added into the chlorine-containing disinfectant to be determined, so that the potassium iodide is oxidized and iodine is separated out, and the potassium iodide is not oxidized under the condition of adding an acid into the disinfectant. The operating process of implementing the evaluation method comprises the steps of adding a plurality of KI powder into a quantitative disinfectant to be determined, carrying out titration by using standard sodium thiosulfate, and calculating the initial chloride equivalent according to the consumption of the standard sodium thiosulfate. By using the evaluation screening method and operating process disclosed by the invention, the initial chloride equivalent of a disinfectant can be rapidly determined. The stability and storage capacity of a disinfectant and the initial reaction capacity (closely relevant to a spray disinfection method) of the disinfectant are evaluated by using the chlorine equivalent, thereby solving the problem of evaluation index distortion caused by separately using available chlorine.

Description

Technical field [0001] The invention relates to a method for evaluating and screening chlorine-containing disinfectants, which includes the steps of oxidation of available chlorine and potassium iodide in the disinfectants, the step of titrating iodine with a sodium thiosulfate standard solution, and the calculation is based on the consumption of the sodium thiosulfate standard solution Steps to find the available chlorine content. [0002] The invention also relates to an operating process for realizing the evaluation and screening method of the chlorine-containing disinfectant, including the chemicals used, operating steps and calculation formulas. Background technique [0003] Chlorine-containing disinfectants mainly include three-in-one, sodium hypochlorite, etc. It is a high-efficiency disinfectant, convenient to use and affordable, and is widely used in major disaster relief operations for epidemic prevention and biological and chemical poison decontamination. [0004] Accordi...

AI Technical Summary

Problems solved by technology

In actual use, the effective chlorine evaluation disinfectant determined by iodometric method encounters the following index distortion problems: First, although the measured effective chlorine content of different chlorine-containing disinfectants is the same, the disinfection effect is quite different, such as hypochlorous acid The disinfection effect of calcium solution is not as good as that of sodium hypochlorite solution within a certain period of time; the second is that the same disinfectant has the same effective chlorine but the disinfection effect is also significantly different, such as the three-in-two clarified solution is worse than its suspension; The disinfection effect of the stored compound chlorine-containing disinfectant is not as fast as that of the original chlorine-containing disinfectant

[0006] None of the above literatures have seen the improvement of the evaluation and screening methods of chlorine-containing disinfectants and the solution to the problem of distortion of available chlorine indicators