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  • Title: [Determination of pesticide residues and microcystin in drinking water using on-line SPE liquid chromatography-mass spectrometry].
    Author: Guo J, Zhao Y, Zhang J, Chen H, Shao B.
    Journal: Wei Sheng Yan Jiu; 2012 Mar; 41(2):235-9. PubMed ID: 22611933.
    Abstract:
    OBJECTIVE: To develop a method based on on-line solid phase extraction followed liquid chromatography mass spectrometry for determination of 9 pesticides and microcystin-LR in drinking water. METHOD: Drinking water samples were concentrated by a HRP-SPE cartridge and separated on a HSS T3 column with a gradient mobile phase of acetonitrile and aqueous 0.1% formic acid, then analyzed by triple quadrupole mass spectrometry (TQ-MS) and time of flight mass spectrometry (TOF-MS), respectively. Mass acquisition was conducted under positive electrospray ionization mode. Quantification was performed by external standard calibration. RESULTS: The quantification limits (LOQs) of 10 target compounds were far below the limits set by the National Standards for Drinking Water Quality. The LOQs of TOF-MS was 0.01-0.40 microg/L and the LOQs of TQ-MS was 0.01-0.19 microg/L. Recoveries of 10 target compounds were 66.5%-130.3% with relative standard deviation between 0.8% and 14.5%. CONCLUSION: Due to its rapidness, simpleness, and high sensitivity, the method is suitable for the determination of pesticides and microcystin-LR in drinking water.
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