Method for detecting residual amount of hydrogen peroxide in water

Abstract

The embodiment of the invention discloses a method for detecting the residual amount of hydrogen peroxide in water. The method comprises the following steps: preparing a reagent and a hydrogen peroxide standard solution for later use; preparing hydrogen peroxide standard samples with different concentration gradients; sequentially adding 5.0mL of a sodium chloride solution, 1.0mL of a hydrochloricacid solution, 1.0mL of a potassium iodide solution, 0.5mL of an ammonium molybdate solution and 1.0mL of a starch indicator into the hydrogen peroxide standard samples; measuring the absorbance at the wavelength of 570nm, and obtaining a standard curve and a linear regression equation thereof according to the corresponding relationship between the absorbance value and the hydrogen peroxide concentration; and absorbing a water sample, treating the water sample in the same way as the hydrogen peroxide standard samples to determine absorbance, and substituting an absorbance value into the linear regression equation to calculate the content of hydrogen peroxide. Compared with two existing national standard methods, the method provided by the embodiment of the invention has the advantages that the residual amount of hydrogen peroxide detected by the method is more accurate, the detection limit is lower, the operation is simple, and the method is more suitable for large-batch detection andmonitoring of factories and laboratories.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of hydrogen peroxide content detection, and in particular to a method for detecting residual hydrogen peroxide in water. Background technique [0002] Due to its strong oxidizing ability and environmental protection features, hydrogen peroxide is widely used as oxidant, disinfectant, sterilant and bleaching agent in environmental protection, daily chemical, food, medical and printing and dyeing industries. In addition, hydrogen peroxide can also be activated by transition metal ions, metal oxides, microwave radiation, and ultraviolet radiation to generate hydroxyl radicals with stronger oxidizing ability, and is widely used in the field of environmental protection, especially in the field of water treatment to remove refractory organic compounds. Pollutants and inactivation of pathogenic microorganisms. In the process of using hydrogen peroxide, it is often accompanied by the decom...

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Problems solved by technology

[0004] For this reason, the embodiment of the present invention provides a method for detecting the residual amount of hydrogen peroxide in water, so as to solve the problem that the "iodometric method" in the prior art is not easy to detect low-level hydrogen peroxide and the "titanium salt colorimetric method" operates dangerous problem

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