Objectives To establish a.Methods for simultaneous determination of 5 neonicotinoid insecticides, including acetamiprid, thiacloprid, imidacloprid, nitenpyram and thiamethoxam, in drinking water by liquid chromatography-tandem mass spectrometry.
Method After passing 0.22 μm filter membrane, water samples were injected directly to and detected by LC-MS. The chromatographic column was Waters Acquity UPLC BEH C18(2.1 mm×50 mm,1.7 μm). The determination was performed at 3 levels, and each level was repeated for 7 times.
Results For all 5 neonicotinoid insecticides, a good linearity was in the range of 2~200 μg/L (r > 0.99); the limit of detection (LOD) was below 0.2 μg/L; the recovery rate for standard addition was in the range of 88.5%~111.3% and the relative standard deviation (RSD) was in the range of 0.8%~6.9%.
Conclusions The method was simple, fast, and its accuracy and sensitivity could be satisfied with simultaneous determination of 5 neonicotinoid insecticide residues in drinking water.
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