Method for simultaneously determining multiple heterocyclic pesticides, degradation products and intermediates in water by adopting liquid-liquid extraction/liquid chromatography

A liquid chromatography and degradant technology, applied in the field of environmental monitoring, can solve the problems of incomplete coverage of target substances, low integration, high detection cost, low detection limit, ensure impurity removal ability and recovery rate, linearity. good relationship
CN112461960AActive Publication Date: 2021-03-09湖南省生态环境监测中心
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
湖南省生态环境监测中心
Publication Date
2021-03-09

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Abstract

The invention provides a method for simultaneously determining various heterocyclic pesticides, degradation products and intermediates in water by liquid-liquid extraction / liquid chromatography. The method comprises the following steps of by using dichloromethane as an extractant, extracting a neutral water sample added with sodium chloride, extracting the target, drying, and concentrating the extract to obtain the target product; purifying the extract, and replacing the solvent with acetonitrile or directly replacing the solvent with acetonitrile; and separating and detecting by using a liquid chromatograph, carrying out gradient elution by using a ternary mobile phase or a binary mobile phase during separation, and quantifying by using an external standard method according to the qualitative retention time to obtain the concentration of each target object in the water sample. The method is efficient, easy to operate, low in detection limit, good in accuracy and precision and good inlinear relation, 16 heterocyclic pesticides, degradation products and intermediates can be detected at the same time, and problems that an existing heterocyclic pesticide detection method is not highin integration level, incomplete in target object coverage and even vacant, tedious in step and high in detection cost are solved; requirements of heterocyclic pesticide environment monitoring and management in China at the present stage are met.
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Description

Technical field:

[0001] The invention relates to the technical field of environmental monitoring, in particular to a method for simultaneously measuring various heterocyclic pesticides, degradation products and intermediates in water quality by using liquid-liquid extraction / liquid chromatography. Background technique:

[0002] Cyclic compounds in which certain positions of the ring-forming carbon chain are replaced by non-carbon elements such as O, S, and N are called heterocyclic compounds. Heterocyclic pesticides refer to various heterocyclic compounds with insecticidal, herbicidal and bactericidal effects. Heterocyclic pesticides are the most rapidly developed pesticides in recent years. They are highly efficient and relatively low-toxic, and are often used in the control of crop diseases and insect pests. In recent years, the representative varieties of heterocyclic pesticides with large production tonnage, serious pollution to humans and the ecological environment, and...

Claims

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