QuEchERS method package for efficiently and homogeneously extracting residues of pesticide and veterinary drug

Abstract

The invention discloses a QuEchERS method package for efficiently and homogeneously extracting residues of a pesticide and a veterinary drug. The QuEchERS method package comprises an extraction pipe containing ammonium sulfate, a buffer salting-out phase-splitting salt package containing a mixture of anhydrous magnesium sulfate and sodium chloride, a needle cylinder type membrane filter containing a mixture of PSA, graphitized carbon black and a C18 reverse phase silica gel filler, and a salting package tool, wherein the PSA is an N-propylethylendiamine-modified silica gel filler and the C18 reverse phase silica gel filler is an octadecyl-modified reverse phase silica gel filler. According to the method, the technical feature of the combination of extraction, salting-out phase-splitting and dehydration purification is fully utilized, devices, materials and operating steps are reasonable to form, the structure is simple, and the operation is easy and convenient.

Description

technical field [0001] The invention relates to a sample pretreatment method package, in particular to a QuEChERS method package for efficient homogeneous extraction of pesticide and veterinary drug residues. Background technique [0002] QuEChERS is a convenient and efficient sample pretreatment technology for the detection of pesticide residues in fruit and vegetable samples. This method uses acetonitrile, a water-soluble organic solvent, as the extraction agent, and combines uniform extraction, salting out, phase separation and dehydration purification to achieve Efficient extraction of pesticide residues in high water content fruit and vegetable samples. In order to improve the wide adaptability of the QuEChERS method to the detection of pesticide residues of various samples and various chemical properties, the original QuEChERS technology (also known as original QuEChERS) has been improved in the American standard (AOAC2007.01) and the European standard (EN15662). To e...

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Problems solved by technology

[0003] At present, the QuEChERS sample pretreatment technology has become the standard pretreatment method for the detection of pesticide residues in fruit and vegetable samples in the United States and the European Union, and has been widely used in my country. However, the current method first adds anhydrous magnesium sulfate and inorganic salts during the sample extraction process. , it is easy to cause magnesium sulfate agglomeration and excessive calorific value, causing volatilization loss of volatile pesticide residues

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