气相色谱法测定鲜枸杞中氧乐果农药残留量的不确定度评定

Evaluation of uncertainty in determination of omethoate pesticide residues in fresh wolfberry by gas chromatography

中文关键词:  鲜枸杞  气相色谱法  氧乐果  不确定度

英文关键词:fresh wolfberry  gas chromatography  omethoate  uncertainty

中文摘要:

      目的 评定气相色谱法测定鲜枸杞中氧乐果含量的不确定度。方法 参考JJF 1059.1-2012《测量不确定度评定与表示》, 应用国家农业行业标准NY/T 761-2008《蔬菜和水果中有机磷、有机氯、拟除虫菊酯和氨基甲酸酯类农药多残留的测定》对鲜枸杞中氧乐果农药残留进行检测, 并对其测定过程的不确定度进行了评定和分析。结果 在鲜枸杞中的氧乐果含量测定中, 当样品的氧乐果含量为0.045 mg/kg时, 其扩展不确定度为0.006 mg/kg(k=2), 结果表示为(0.045±0.006) mg/kg。结论 鲜枸杞中氧乐果农药残留测量结果的主要不确定度来自样品重复测量, 标准溶液配制, 样品前处理、定容, 标准溶液重复测定, 样品称量5个因素, 其中样品重复测量引入的相对标准不确定度分量贡献最大, 而由样品称量引入的相对标准不确定度分量最小。

英文摘要:

      Objective To evaluate the uncertainty of determination of omethoate pesticide residues in fresh wolfberry by gas chromatography. Methods Referring to JJF 1059.1?2012 “Evaluation and expression of measurement uncertainty”, the national agricultural industry standard NY/T 761-2008 “Determination of organophosphorus, organochlorine, pyrethroid and carbamate pesticide residues in vegetables and fruits” was applied to detect omethoate pesticide residues in freshwolfberry, and the uncertainty of the determination process was evaluated and analyzed. Results In the determination of omethoate pesticide residues in fresh wolfberry, When the content of omethoate in fresh wolfberry was 0.045 mg/kg, the expansion uncertainty was 0.006 mg/kg (k=2), and the result was expressed as(0.045±0.006) mg/kg. Conclusion The main uncertainty in the determination of omethoate pesticide residues in fresh wolfberry came from 5 factors: repeated measurement of samples, preparation of standard solution, pretreatment and constant volume of sample, repeated determination of standard solution, and weighting of sample, the relative standard uncertainty introduced by the repeated measurement of the sample contributes the most, and the relative standard uncertainty introduced by the weighting of the sample is the least.