A rapid, stable and highly sensitive method for the detection of pesticide samples

Abstract

The invention discloses a novel method for detecting pesticide samples. This method uses a rectangular ion trap mass spectrometer equipped with a thermal desorption low-temperature plasma ionization source and a discontinuous atmospheric pressure interface as the detection instrument, and realizes rapid, stable and highly sensitive detection of pesticide samples through direct mass spectrometry or tandem mass spectrometry analysis. less than 1s. Operation process: Place the solid or liquid sample on the sampling cloth, insert the sampling cloth into the inlet of the thermal desorption low-temperature plasma, and then start the mass spectrometry scan, and obtain the mass spectrogram of the sample within 1 second. The thermal analysis low-temperature plasma ionization source can use one or more of helium, argon, nitrogen or air as the discharge gas for discharge, and the carrier gas can choose one of air, dry air, helium, argon or nitrogen. species or several. The detection mode of the rectangular ion trap mass spectrometer is negative ion mode. When this method is used for the detection of pesticide samples, the detection speed is high, the sensitivity is high, and the stability is strong.

Description

technical field [0001] The invention relates to a method for detecting pesticides such as organophosphorus and organochlorine, which is a mass spectrometry analysis method based on rectangular ion trap mass spectrometry. This method has fast analysis speed, high reproducibility of detection results, strong stability, and high sensitivity for pesticide samples, and the detection limit of the sample is in the pg level. Background technique [0002] Pesticide is an important means of production. While ensuring the output of food crops in my country, it also brings many problems, such as: excessive use of pesticides pollutes the river soil, pesticide residues endanger people's health and so on. Especially in recent years, the exposure of "poisonous rice", poisonous vegetables and other incidents has raised people's attention to pesticide testing to a new height. [0003] Traditional pesticide detection technologies are mainly chromatography (including gas chromatography and liq...

AI Technical Summary

Problems solved by technology

These methods often require complex sample pretreatment, such as: solid phase extraction, solid phase microextraction, matrix solid phase dispersion and supercritical extraction, etc., not only the operation is complicated, but also the sample analysis takes a long time

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