GC-ECD法测定茯苓中5种拟除虫菊酯类农药

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中图分类号：TS207.3 文献标志码：A 文章编号：1674-0270（2025）35-0088-04

Abstract： The paper establishes a GC-ECD method using QuEChERS as the sample pretreatment to detec five pyrethroid pesticides in Poria cocos.Poria cocos samples were purified and extracted using the QuEChERS method and thenanalyzed with gaschromatography equipped with an ECD detector.Identification was basedonthe retention time and peak shape of chromatographic peaks，and quantification was performed using an external standard method with matrix-matched calibration curves. Results show， within the concentration range of O.05 to 100.0μg/ml L， all target substances exhibit good linear relationship，with correlation coefficients R2 not lower than O.999 2. At the added levels of 0.05， 0.10 and 0.50mg/kg ，the recovery rates range from 78.5% to 104.7% ， and the relative standard deviations SRSD are between 1.71% and 3.61% （n=6）.Furthermore，the detection limit of this method is between O.OOO 5 and （2 0.015mg/kg .This method exhibits high accuracy，excellent sensitivity，and is eficientand rapid， making it suitable for the detection of five pyrethroid pesticide residues in Poria cocos.

Key Words： Poria cocos; pyrethroid pesticides; gas chromatography; ECD detector

茯苓（Poriacocos）是我国大宗药食同源药材，畅销国内外市场。（剩余4880字）