二氧化硅共沉淀对食品重金属铅测定的干扰分析  

Interference of SiO_2 Co-Precipitation in Determination of Heavy Metal Pb in Foodstuff

作　　者：周聪[1] 彭黎旭[1] 刘洪升[1] 高丽花[1] 

机构地区：[1]中国热带农业科学院分析测试中心,海南儋州571737

出　　处：《海南大学学报（自然科学版）》2003年第2期126-129,共4页Natural Science Journal of Hainan University

摘　　要：讨论了二氧化硅沉淀对食品痕量铅测定的干扰问题,结果表明:在酸性条件下,样品消化液中析出的二氧化硅沉淀与痕量铅产生共沉淀作用,影响铅测定结果的准确性.调整试验方法后,可有效消除二氧化硅沉淀对测定的干扰,对国家标准物质(GBW07605)茶叶进行分析测试,其准确度达(100±5)%.This paper discussed the interference of SiO2 coprecipitation in determination of heavy metal Pb in foodstuff. The results showed that under acidic condition, the SiO2 from the samples solution can coprecipitate with the trace Pb, affecting the accuracy of determination; but when the experimental method was improved, the interference of SiO2 coprecipitation in determination of Pb can be effectively avoided, and a determination to the sample tea (meet national standard GBW07605) can also reach the accuracy of (100±5)%.

关 键 词：食品检验 食品安全 重金属 铅 含量测定 二氧化硅 共沉淀 干扰分析 

分 类 号：TS207.51[轻工技术与工程—食品科学]