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《Agrochemicals》 2019-01
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Determination of Low Level Dipaquat and Paraquat Residues in Tea by On-line Column-switching Ion Chromatography

WEI Dan;GUO Ming;TAO Xing-ming;RUAN Ya-nan;YAO Hua-zhen;ZHANG Zhi-xue;LIU Cui-ping;Department of Environment Health and Food Technology, Hangzhou Wanxiang Polytechnic;Zhejiang Research Institute of Chemical Industry;  
[Aims] Determination of low level dipaquat and paraquat residue in tea was developed. [Methods] After large volume(2 m L) injection of tea sample, the on-line sample clean-up and separation was achieved and then enriched on Dionex IonPac SCG column. After column switching, the separation and determination of dipaquat and paraquat cation ions was performed using Dionex IonPac SCS column and UV detection. [Results] Good linearity in the range of 0.0030-2.5 and 0.0015-2.5 mg/kg was obtained with correlation coefficient(R~2) of 0.9991 and 0.9984 for diquat and paraquat, respectively. Limits of detection(S/N=3) were 0.75, 0.30 μg/kg for diquat and paraquat,respectively. Recoveries ranged from 86.9 to 102.9% and repeatability results were acceptable with relative standard deviation of less than 10.1%. [Conclusions] The proposed method was simple, rapid and reliable and may have the high potential as screening tools for food safety and inspection controls.
【CateGory Index】: TS272.7;O657.7
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