Method for measuring residual content of methyl-parathion and malathion in seawater

Abstract

The invention provides a method for measuring the residual content of methyl-parathion and malathion in seawater. The method is characterized by comprising the following steps: (1) preparation of standard reserve solutions of methyl-parathion and malathion, namely weighing standard products of methyl-parathion and malathion, separately preparing 1 mg / mL standard reserve solutions with acetone as a solvent and storing the standard reserve solutions in a refrigerator; (2) preparation of a mixed standard solution of methyl-parathion and malathion, namely separately preparing the mixed standard solution of methyl-parathion and malathion with the concentration of 01.-1.0 mg / L from the standard reserve solutions prepared in step (1); (3) drawing of a standard curve; and (4) pre-process of a sample, namely extracting the sample with a polyacrylamide extraction head and analyzing with a chromatographic instrument. The method for measuring the residual content of methyl-parathion and malathion in seawater has the beneficial effects that the consumed time is short; the efficiency is increases; the solvent is saved; the usage amount of the sample is little; the operation is simple; the automation is easily realized; the whole experiment process is free of pollution and the environment-friendly requirements are met.

Description

technical field [0001] The invention belongs to a method for detecting organic phosphorus compounds in seawater, in particular to a method for detecting the content of residual methyl parathion and malathion in seawater. Background technique [0002] Since the 1960s, many countries began to restrict and prohibit the use of organochlorine pesticides. As an alternative to organochlorine, organophosphorus pesticides are popular in China due to their high efficacy, many varieties, wide range of prevention, fast degradation, low residue, and low cost. Organophosphorus pesticides are the first class of insecticides synthesized by humans and are still widely used. Organophosphorus pesticides are represented by methamidophos, parathion, methyl parathion, monocrotophos Phosphorus, etc.; but with the widespread use of organophosphorus pesticides, the residues of organophosphorus pesticides have also brought serious negative impacts due to the illegal production, sale and use of pestic...

AI Technical Summary

Problems solved by technology

[0007] Methyl parathion was synthesized by G. Schrader of Farben, Germany in 1944. It was put into production by the company in 1949, and it was produced in many countries afterwards. This product is an organophosphorus insecticide with contact killing It has a stomach poisoning effect and can inhibit the activity of cholinesterase in the nervous system of pests to cause death. It has a wide insecticidal spectrum and is often processed into emulsifiable concentrate or powder. Its main purpose is to prevent and control various agricultural pests. Due to its high toxicity, it must be strictly controlled. Apply pesticides according to regulations, and strengthen safety protection measures. The control objects are similar to parathion (1605), and can control various pests of rice, tea, fruits and vegetables, etc., but the control effect is slightly lower than that of parathion, so the dosage should be increased. , because methyl parathion is safer than parathion, it is often used to control cotton and fruit tree pests

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