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| Determination of Five Carbamate Pesticides Residues in Oolong Tea by Gas Chromatography-Tandem Mass Spectrometry |
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| DOI： |
| KeyWord:Oolong-tea QuEChERS carbamate pesticides gas chromatography-tandem mass spectrometry(GC-MS/MS) |
| Author | Institution |
| YU Yu-cheng，FANG Ling，SU De-sen*，LIN Qiu，FU Jian-wei，LUO Chao |
1.福建省农业科学研究院农药质量标准与检测技术研究所福建省精密仪器农业测试重点实验室;2.福建省食品药品质量检验研究院 |
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| Abstract: |
| A gas chromatography-tandem mass spectrometric(GC-MS/MS) method was developed for the determination of 5 carbamate pesticides residues，i.e，metolcarb，isoprocarb，fenobucarb，propoxur and pirimicarb in Oolong tea samples.The sample was extracted with hexane-ethyl acetate mixed solution,and the extract was cleaned up with a QuEChERS kit，including 400 mg PSA/400 mg C18/1 200 mg MgSO4.The mixed targets were separated on a Rxi-5 Sil MS(30 m，0.25 mm×0.25 μm) capillary column,and pesticide residues were identified and quantified by GC-MS/MS.5 carbamate pesticides had good linear relationships in each linear range(5-500 μg/kg for metolcarb and propoxur，1-500 μg/kg for isoprocarb，fenobucarb and pirimicarb)，and the correlation coefficients were higher than 0.99.The mean recoveries of metolcarb and propoxur in black Oolong tea at spiked levels of 5，20，100 μg/kg were in the range of 77.5%-95.4%,with RSDs(n=6) of 2.1%-6.1%.The LODs and LOQs for the two targets were 1 μg/kg and 5 μg/kg，respectively.The mean recoveries of isoprocarb，fenobucarb and pirimicarb at spiked levels of 1，20，100 μg/kg were in the range of 79.5%-102.5%with RSDs(n=6) of 2.0%-8.2%.The LODs and LOQs were 0.2 μg/kg and 1 μg/kg，respectively.With the advantages of simple operation，high sensitivity and good reproducibility,this method could meet the requirements for the determination of 5 kinds of carbamate pesticides residues in Oolong tea samples. |
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