Analytical method for simultaneous determination of organophosphorus and pyrethroid pesticide residues in fresh tea leaves
A technology for pyrethroids and pyrethroids is applied in the analysis field of simultaneous determination of organophosphorus and pyrethroid pesticide residues in fresh tea leaves, and can solve the problems of cumbersome operation, long time consumption, unstable and reliable detection results, etc. problem, to achieve the effect of strong flexibility and wide application range
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[0045] Example: An Analytical Method for Simultaneous Determination of Organophosphorus and Pyrethroid Pesticide Residues in Fresh Tea Leaves
[0046] The fresh leaves of the tested tea were taken from a local tea plantation in Suzhou, crushed and mixed by a pulverizer, put into a clean container, and stored in a -20°C refrigerator for later use. The analytical method consists of two parts:
[0047] In the first part, the standard curves of the measured organophosphorus pesticides and pyrethroid pesticides of known gradient concentrations are respectively established by gas chromatography; the establishment of the standard curve consists of the following steps:
[0048] The first step is to prepare a blank matrix extract, and the preparation method consists of the following steps:
[0049] (1) Weigh 5.0 g of blank tea fresh leaf samples that do not contain tested organophosphorus pesticides and pyrethroid pesticides, place them in a 50 mL centrifuge tube, and then add 10 mL o...
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