Determination of Organophosphorus Pesticides in Soybean Oil, Peanut Oil and Sesame Oil by Low-Temperature Extraction and GC-FPD |
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Authors: | Li Li Zhiqiang Zhou Canping Pan Chuanfan Qian Shuren Jiang Fengmao Liu |
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Institution: | (1) Department of Applied Chemistry, College of Science, China Agricultural University, 100094 Beijing, People’s Republic of China |
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Abstract: | A low-temperature clean-up method for residue determination was developed and validated for 14 organophosphorus pesticides
in soybean oil, peanut oil and sesame oil by gas chromatography with flame photometric detector (GC-FPD). A different matrix
influenced the response and retention time of pesticides. Hence matrix-matched calibration standards were used to counteract
the matrix effect. The pesticide responses in blank samples of soybean oil, peanut oil and sesame oil were within the linear
range of 0.02–1 mg kg−1 and the correlation coefficients were higher than 0.9989. Average recoveries obtained from different oil samples at three
fortified levels were higher than 50% with relative standard deviations (RSDs) of less than 15%. The limit of detections (LODs)
of studied pesticides ranged from 2 to 5 μg kg−1. Thirty-nine commercial samples were analyzed, and the results were confirmed by gas chromatography–mass spectrometry (GC–MS)
in selective ion monitoring (SIM) mode. |
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Keywords: | Gas chromatography Organophosphorus pesticides Matrix effect Vegetable oils |
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