气相色谱法测定蔬菜中甲基对硫磷残留量的不确定度评定
Uncertainty of Determination of Methyl Parathion Residues in Vegetables by Gas Chromatography
李志孟 1易静 2罗杰鸿2
作者信息
- 1. 通标标准技术服务有限公司广州分公司,广东广州,510000
- 2. 广东安纳检测技术有限公司,广东广州,510000
- 折叠
摘要
依据《测量不确定度评定与表示》(JJF 1059.1-2012)和《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》(NY/T 761-2008),建立评定蔬菜中甲基对硫磷残留量测定不确定度的数学模型,分析其测定不确定度的主要来源有样品质量称量、体积、工作液配制、添加回收、精密度,计算其合成标准不确定度与扩展不确定度.结果表明,标准储备液及标准工作液配制引入的不确定度是不确定度的关键来源,甲基对硫磷合成标准不确定度Uc(W)为 0.001 82 mg/kg,取置信水平为 95%,甲基对硫磷扩展不确定度U(W)为 0.003 64 mg/kg,蔬菜中甲基对硫磷残留量测定的不确定度可表示为(X±U)=(0.10±0.003 64)mg/kg.
Abstract
According to the"Evaluation and Expression of Measurement Uncertainty"(JJF 1059.1-2012)and"Determination of Organophosphorus,Organochlorine,Pyrethroid and Amino Ester Pesticide Residues in Vegetables and Fruits"(NY/T 761-2008),a mathematical model is established to evaluate the uncertainty in the determination of methyl parathion residues in vegetables.The main sources of measurement uncertainty are sample quality weighing,volume,working solution preparation,addition and recovery,precision,and the synthesis standard uncertainty and extended uncertainty are calculated.The results indicate that the uncertainty introduced by the preparation of standard stock solution and standard working solution is the key source of uncertainty.The standard uncertainty Uc(W)for the synthesis of methyl parathion is 0.001 82 mg/kg,with a confidence level of 95%.The extended uncertainty U(W)for methyl parathion is 0.003 64 mg/kg.The uncertainty in the determination of residual methyl parathion in vegetables can be expressed as(X±U)=(0.10±0.003 64)mg/kg.
关键词
气相色谱法/蔬菜/甲基对硫磷/不确定度/评定Key words
gas chromatography method/vegetable/methyl parathion/uncertainty/evaluate引用本文复制引用
出版年
2024
NETL
NSTL
万方数据