Accurate and rapid detection method for pesticide residues in fruits

Abstract

The invention discloses an accurate and rapid detection method for pesticide residues in fruits. The accurate and rapid detection method comprises the following steps of: (1) carrying out pulp refining on fruits by using a refiner, and adding water and acetonitrile into the pulp for dispersion; (2) adding a magnetic nano-material into the dispersed pulp and carrying out continuous oscillation extraction; (3) separating the magnetic nano-material for extracting and adsorbing the pesticide from the fruit solution by using a magnet; (4) carrying out ultrasonic elution on the pesticide adsorbed by the magnetic nano material by adopting a small amount of organic reagent, and adding anhydrous sodium sulfate into eluent for dehydration; (5) adding an internal standard compound solution; and (6) analyzing and detecting a to-be-detected liquid by using a gas chromatograph-mass spectrometer. The accurate and rapid detection method for pesticide residues in the fruits has the advantages of being short in operation time, low in organic reagent consumption, low in analysis cost, accurate in analysis result and easy to popularize.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to an accurate and rapid detection method for pesticide residues in fruits. Background technique [0002] With the rapid growth of my country's economy and the improvement of people's living standards, the production and consumption of fruits have increased rapidly year by year. In order to meet product output and extend the quality assurance period, fruit farmers use pesticides and other preservatives in the production process to maximize economic benefits. With my country's restrictions on the use of organochlorine pesticides such as DDT and HCH, as well as the highly toxic methamidophos, the more common pesticides used by fruit farmers are mainly other organophosphates with relatively weak toxicity and pyrethroids with medium and low toxicity. Pesticides. The output of organophosphorus pesticides in my country accounts for one-third of the world's total, and the output of orga...

AI Technical Summary

Problems solved by technology

However, in the actual implementation process, the pretreatment method provided by the national standard needs to use a large number of highly pure organic reagents on the one hand, and these reagents will inevitably cause health hazards to experimenters; on the other hand, it also needs to use expensive Various solid-phase adsorption cartridges, these reagents and cartridges must be properly treated after use; in particular, the entire pretreatment process has many steps, takes a long time, is generally time-consuming and laborious, and results in a relatively low recovery rate And there are disadvantages such as high cost

There are patented technologies that are optimized in sample pretreatment, but in the detection process, high-end ultra-high performance liquid chromatography-tandem triple quadrupole mass spectrometers and other high-end instruments that are expensive, maintenance and maintenance, and use costs must be used Instruments, this technology is difficult to gain rapid popularization in a short period of time

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