Method for quantitatively detecting organophosphorus pesticide chlorpyrifos in environmental air

Abstract

The invention provides a method for quantitatively detecting organophosphorus pesticide chlorpyrifos in environmental air, and belongs to the field of detection methods for pesticide residues. The method comprises collection of a sample (comprising a gas phase part and a particulate matter part), pretreatment of the sample and chromatography-tandem mass spectrometry quantitative detection. Compared with reported methods, the detection of the chlorpyrifos in the environmental air is higher in selectivity and higher in sensitivity through the optimization of parameters of a chromatography-mass spectrometry detection method. According to the method, by the use of a multi-reaction monitoring technology of high performance liquid chromatography/tandem mass spectrometry, the shortcoming that a conventional detector cannot have the selectivity and the sensitivity at the same time during detection of a trace chlorpyrifos compound in a complicated background matrix is overcome, and qualitation and quantitation are more accurate and reliable. Therefore, compared with conventional UV-Vis, HPLC/PDA, GC/ECD and GC/NPD, the method provided by the invention has very outstanding advantages.

Description

technical field [0001] The invention relates to the field of detection methods for pesticide residues, in particular to a method for quantitatively detecting the organophosphorus pesticide chlorpyrifos in ambient air. Reaction (multiple reaction monitoring, MRM) quantitative detection technology is a method for rapid quantitative detection of organophosphorus pesticide chlorpyrifos compounds in ambient air. Background technique [0002] Chlorpyrifos is a broad-spectrum organophosphorus insecticide, which is widely used to prevent and control various pests in crops, Chinese herbal medicine planting and fruit tree cultivation, and has a control effect on underground pests. Chlorpyrifos is currently one of the most widely produced and sold insecticides in the world. It is also an important substitute for five highly toxic organophosphorus pesticides in China and a leading pesticide in my country's pesticide market. Chlorpyrifos has long environmental persistence and moderate ...

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Problems solved by technology

[0006] Aiming at the problems of background matrix interference, complex pretreatment and purification steps, easy false positives, and high detection limit in the current detection method of chlorpyrifos in ambient air, the present invention provides a quantitative detection method for quantitative detection of chlorpyrifos in ambient air, established and The HPLC and MS / MS detection method of chlorpyrifos was optimized. The optimized method has better selectivity and higher sensitivity than the conventional detection method. It has significant advantages, and can quickly and quantitatively detect the concentration of chlorpyrifos in ambient air samples through a simple and fast batch pretreatment method, which greatly saves detection time and cost

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