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Why can electrolyzed hypochlorous acid water degrade organic phosphorus pesticide residues?

Views:5     Author:Site Editor     Publish Time: 2021-05-24      Origin:Site

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In March 2021, Li Huiying of Hebei University of Science and Technology and others published in the Journal of Food Safety and Quality Inspection the article "Slightly Acidic Electrolyzed Water's Degradation Mechanism and Pathway Analysis of Organophosphorus Pesticides in Solution System", which clarified the effect of slightly acidic electrolyzed water on the degradation of organophosphorus pesticides. Degradation mechanism of organophosphorus pesticides.

 

The process of degrading organophosphorus pesticides by slightly acidic electrolytic hypochlorous acid water is similar to the process of photocatalytic degradation of pesticides. In the process of photocatalytic degradation of organophosphorus pesticides, OH attacks the P=S bond of organophosphorus pesticides and converts the original P=S bond into P=O bond, which is a reaction characteristic of photocatalytic degradation of organophosphorus pesticides.

 

By analyzing the degradation process of organophosphorus pesticides, it is believed that the degradation pathways of parathion, methyl parathion and dimethoate in slightly acidic electrolytic hypochlorous acid water are the result of the combined effect of HOCl and •OH. The P=S bond of organophosphorus pesticides is attacked by HOCl and •OH to form an intermediate product containing O-P-S ring. The intermediate product is further decomposed and loses S to obtain a compound containing P=O, while the compound containing S is oxidized by HOCl to form SO42-. Compounds containing P=O are further affected by •OH and finally degraded into PO43-, CO2, NO32-, SO42- and other substances. Since the P=O-containing compounds produced by the degradation process have strong electronegativity, they are more toxic than organophosphorus pesticides such as parathion, but the P=O-containing compounds will be further decomposed by slightly acidic electrolyzed water, and their toxicity is far less than the original. There are organophosphorus pesticides. From an overall point of view, the toxicity of the three organophosphorus pesticides, parathion, methyl parathion and dimethoate, will be greatly reduced after being degraded by slightly acidic electrolyzed water.

 

Clean vegetables must meet the principle of "eight nos and eights". Eight nos refer to excessive pesticide residues, no heavy metal residues, no nitrite residues, no other pollution, no old leaves, no sediment, no debris, no stems. Leafy vegetables do not have roots. Eight-yes means that they have production standards, have production and sales records, have quality inspections, have product packaging, have harvest and shelf life, have registered trademarks, have food instructions, and have cold chain storage and transportation.

 

Aiming at the removal of pesticide residues, sterilization and preservation of vegetables in clean vegetable processing, we have developed a clean vegetable quality improvement program based on slightly acidic electrolytic hypochlorous acid water technology. 

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