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Evaluation of the Uncertainty in Determining Organophosphorus and Pyrethroid Pesticides Residue in Vegetables and Fruits by Gas Chromatography
Yu Tingting, Qiu Pengcheng, Chen Qiang, Shi Fu, Yang Yajun
PDF(1372 KB)
PDF(1372 KB)
Evaluation of the Uncertainty in Determining Organophosphorus and Pyrethroid Pesticides Residue in Vegetables and Fruits by Gas Chromatography
The uncertainty of measuring organophosphorus and pyrethroid pesticides residue in vegetables and fruits by gas chromatography was evaluated in this study. Taking NY/T 761—2008 standard method as the research object, chlorpyrifos and fenpropathrin were selected to represent the first and second parts of the method respectively and the uncertainty of the method was evaluated from seven aspects including the sample pretreatment process, instrument measurement and standard solution preparation etc. The relative expanded uncertainty of chlorpyrifos and fenpropathrin pesticide residue is 0.9% and 1.0% (k=2) respectively, among which the uncertainty component introduced by gas chromatograph peak area, standard solution preparation and standard recovery rate are the main source. In order to reduce the uncertainty of test results, it is necessary to improve the stability of equipment, simplify the preparation process of standard solution and improve the operation ability in practice. Simultaneously, the results of uncertainty should be applied to judge whether the detection data is to be in the critical value of limit.
uncertainty / pesticide residue / gas chromatography / organophosphorus pesticides / pyrethroid pesticides {{custom_keyword}} /
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