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Mass-spectrum rapid analysis method for pesticide residue in fruits and vegetables

A pesticide residue and mass spectrometry technology, which is applied in the field of mass spectrometry analysis, achieves the effects of high accuracy, short detection time, and improved spectrum clarity

Active Publication Date: 2014-09-24
JING BRAND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This heating method is more suitable for liquid samples, but it is not suitable for the detection of samples with certain shapes such as fruits and vegetables.

Method used

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  • Mass-spectrum rapid analysis method for pesticide residue in fruits and vegetables
  • Mass-spectrum rapid analysis method for pesticide residue in fruits and vegetables
  • Mass-spectrum rapid analysis method for pesticide residue in fruits and vegetables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this embodiment, the Waters QBB1606 triple quadrupole mass spectrometer is used as the analyzer, and the low-temperature plasma of the discharge is used as the ionization source of the mass spectrometer. The specific steps are:

[0034] ① Establish a pesticide standard mass spectral library

[0035] Select standard solutions of three commonly used pesticides, chlorothalonil, dimethoate, and malathion, and dilute them with methanol to 5 μg / mL respectively. Use a micro-syringe to take 1 μL of the sample and drop it on the sample belt. The gas outlet of the discharge quartz glass tube is at the sample 2 mm above, blow the sample at 45°, the mass spectrometry sampling capillary is 1 mm higher than the sampling belt, and is in the same vertical plane as the discharge quartz glass tube, forming an angle of 135°; place the heating lamp 40 mm above the sample, so that The light is directly irradiated on the sample for 3-4 seconds, and the sample ions enter the triple quadrup...

Embodiment 2

[0041] The type of equipment used in this example and the method for establishing a pesticide standard mass spectrum library are the same as those in Example 1. The detected vegetables are fresh tomatoes. On the sample belt, the gas outlet of the discharge quartz glass tube is 2 mm above the sample, blowing the sample at 45°, the mass spectrometer injection capillary is 1 mm higher than the sample belt, and is in the same vertical plane as the discharge quartz glass tube, at an angle of 135°; Place the heating lamp 40 mm above the sample, so that the light is directly irradiated on the sample for 3-4 seconds, the sample ions enter the triple quadrupole mass spectrometer by vacuum suction, and analyze in the negative ion mode to obtain the The mass spectrum of the tomato blank sample; as Figure 9 As shown in , strong spectral peaks appear at m / z240 and 241.

[0042] Then take the above-mentioned pressed tomato supernatant juice sample, drop three pesticide standard solutions ...

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PUM

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Abstract

The invention discloses a mass-spectrum rapid analysis method for the pesticide residue in fruits and vegetables. A triple quadrupole mass spectrum is adopted as an analyzer, a discharging low-temperature plasma is used as a mass spectrum ionization source, and a sample is placed on a continuous sample introduction belt in front of the low-temperature plasma ionization source; a heating lamp is used for performing rapid non-contact thermal analysis of the sample; the sample is detected in an anion detection mode and compared with the early established spectrogram in a pesticide standard quality mass spectrum library to rapidly judge whether the residue of corresponding pesticide exists in the sample; the method disclosed by the invention improves the qualitative analysis ability and signal strength of the device; and compared with the traditional pesticide residue detection method, the method has the advantages of simple pretreatment, small dosage of organic solvent, short detection period of single sample and the like.

Description

technical field [0001] The invention belongs to a mass spectrometry analysis method, in particular to a mass spectrometry rapid analysis method for pesticide residues in fruits and vegetables. current technology [0002] Pesticides are used to improve crop yield and quality, and play a vital role in modern agricultural production. However, the non-standard use of pesticides will also cause excessive pesticide residues in agricultural by-products, water bodies, and soil. Pesticide residues can accumulate in the human body through the food chain, and long-term consumption and drinking of food and beverages with excessive pesticide residues will cause damage to human health and even lead to death. [0003] At present, pesticide residue detection methods include liquid chromatography, liquid chromatography-tandem mass spectrometry, gas chromatography, gas chromatography-mass spectrometry, etc. Chromatography coupled with mass spectrometry or tandem mass spectrometry has the ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/00
Inventor 王喆刘源才
Owner JING BRAND
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