果蔬汁中氯氰菊酯、多效唑、哒螨灵含量测定能力验证结果分析

Analysis of proficiency testing results of determination of cypermethrin, paclobutrazol and pyridaben content in fruit and vegetable juice

中文关键词:  能力验证  农药残留  QuEChERS  基质效应  果蔬汁

英文关键词:capacity verification  pesticide residues  QuEChERS  matrix effect  fruit and vegetable juice

中文摘要:

      目的 分析果蔬汁中氯氰菊酯、多效唑、哒螨灵含量测定能力验证结果。方法 本实验室参加中国检验检疫科学研究院测试评价中心组织的果蔬汁中氯氰菊酯、多效唑、哒螨灵的测定能力验证(ACAS-PT806-2019), 根据能力验证作业指导书要求和样品情况, 采用了QuEChERS样品前处理净化方案, 气相色谱电子捕获检测器检测氯氰菊酯, 内标法定量, 液相色谱串联质谱检测多效唑和哒螨灵, 外标法定量。 结果 1号样品中氯氰菊酯、多效唑、哒螨灵残留量分别为0.098、0.043、0.084 mg/kg, 2号样品中氯氰菊酯、多效唑、哒螨灵残留量分别为: 0.036、未检出、0.013 mg/kg。所有测定项目结果均为满意(|Z|≤2)。结论 实验室解决了此次能力验证中没有空白样品, 检测项目基质效应差异明显等难点。实验室农药残留检测能力得到有效验证和提高。

英文摘要:

      Objective To analyze the proficiency testing results of determination of cypermethrin, paclobutrazol and pyridaben content in fruit and vegetable juice. Methods The laboratory participated in the verification of determination ability of cypermethrin, paclobutrazol and pyridaben in fruit and vegetable juice (ACAS-pt806-2019) organized by test evaluation center of Chinese Academy of Inspection and Quarantine. According to the requirements of the operation instruction for capacity verification and the sample situation, the samples were purified by pretreatment and purification scheme of QuEChERS, cypermethrin was detected by gas chromatography electron capture detector and quantified by internal standard method, paclobutrazol and pyridaben was detected by liquid chromatography tandem mass spectrometry and quantified by external standard method. Results The residues of cypermethrin, paclobutrazol and pyridaben in No.1 sample were 0.098, 0.043 and 0.084 mg/kg, respectively, and the residues of cypermethrin, paclobutrazol and pyridaben in No.2 sample were 0.036, undetected and 0.013 mg/kg, respectively. All the test results were satisfactory (|Z|≤2). Conclusion This laboratory solves the difficulties such as no blank sample in this ability verification, significant difference in matrix effect of test items, etc. The detection ability of pesticide residue in the laboratory is effectively verified and improved.