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0.00182 mg/kg,取置信水平为95%,甲基对硫磷扩展不确定度U(W)为0.00364 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±0.00364)mg/kg。
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 0.00182 mg/kg,with a confidence level of 95%.The extended uncertainty U(W)for methyl parathion is 0.00364 mg/kg.The uncertainty in the determination of residual methyl parathion in vegetables can be expressed as(X±U)=(0.10±0.00364)mg/kg.
作者
李志孟
易静
罗杰鸿
LI Zhimeng;YI Jing;LUO Jiehong(Tongbiao Standard Technical Services Co.,Ltd.Guangzhou Branch,Guangzhou 510000,Guangdong,China;Guangdong Anna Testing Technology Co.,Ltd.,Guangzhou 510000,Guangdong,China)
出处
《四川化工》
CAS
2024年第2期28-31,共4页
Sichuan Chemical Industry
关键词
气相色谱法
蔬菜
甲基对硫磷
不确定度
评定
gas chromatography method
vegetable
methyl parathion
uncertainty
evaluate
