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Date of Publication:2022-10-10

Journal:农业环境科学学报

Issue:4

Page Number:708-714

ISSN No.:1672-2043

Abstract:Direct determination of enantiomers of fenamiphos and its major transformation products(i.e., sulfoxide and sulfone)was achieved using a combination of chiral high performance liquid chromatography(HPLC)and modified QuEChERS(Quick, Easy, Cheap, Effective, Rugged and Safe)preprocessing technique. These compounds were separated individually on a HPLC system equipped with a Chiralpak AD-H stationary phase, via distinct chiral resolution mechanisms depending on organic alcohols and temperature. It was difficult to achieve direct chiral resolution of a mixture of these compounds under general conditions. Here, trace water 0.02% was added as a modifier to the mobile phase comprising n-hexane and 2-propanol(87/13, V/V), yielding baseline separation of the mixture. This method, in combination with modified QuEChERS technique, was applied to determine these compounds in soil samples spiked at the levels of 0.05/0.1, 0.5 and 5 mg·kg-1. The recoveries ranged from 82.5% to 97.4% with relative standard deviations(RSD)of 2.5%~6.1%, validating its application in determina-tion of fenamiphaos residues in soils.

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