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

A sensitive detection and high stability technology, applied in the field of mass spectrometry based on rectangular ion trap mass spectrometry, can solve the problems of long time required for sample analysis and complicated operation, and achieve convenient tandem mass spectrometry analysis, high sensitivity and accuracy high effect

Active Publication Date: 2019-04-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment 1

[0021] figure 2 The specific analysis process and voltage sequence of thermal desorption low temperature plasma rectangular ion trap mass spectrometry are given. It can be seen from the figure that the sample is divided into 4 stages from injection to analysis, namely injection stage, ion cooling stage, scanning analysis stage and zeroing stage. The whole analysis time is less than 500ms, indicating that thermal desorption low temperature plasma rectangular ion trap mass spectrometry is a fast detection method.

Embodiment 2

[0023] image 3 The mass spectra of imidophos, mirex, heptachlor and oxadiazon with the detection concentration of 10 ppm in the negative ion detection mode of thermal desorption low temperature plasma rectangular ion trap mass spectrometry are given. Phosphorus is an organophosphorus pesticide, mirex is a pesticide, heptachlor is a cyclodiene pesticide, and oxadiazon is a herbicide. It can be seen from the figure that the four pesticide samples have strong mass spectral response signals. And the relative standard deviations (RSDs) of the detection of imidophos, mirex, heptachlor and oxadiazon samples were 15%, 13%, 10% and 8%, respectively. Therefore, thermal desorption low temperature plasma rectangular ion trap mass spectrometry is a fast, highly sensitive and stable pesticide detection method.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 李海洋王爽候可勇陈文东渠团帅王祯鑫
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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