预富集-冷蒸气原子吸收光谱法测定饮料中的痕量汞  

Determination of Mercury in Beverages by Cold Vapour-atomic Absorption Spectrometry after Enrichment

作　　者：陈学泽[1] 沈银梅[1] 杨献珍[1] 

机构地区：[1]中南林业科技大学理学院,长沙410004

出　　处：《分析科学学报》2007年第3期364-366,共3页Journal of Analytical Science

摘　　要：使用吡咯烷二硫代氨基甲酸铵（APDC）作配位剂,在pH 6.0的条件下,用固体硅胶捕集、膜滤纸抽滤分离Hg-APDC配合物,然后用0.1 mol/L盐酸从膜滤纸上洗下硅胶,得到能够直接用冷蒸气原子吸收光谱法（CV-AAS）测定汞的悬浊液.在150 mL样品溶液中,特征质量为0.01 ng/1%.用本法测定了饮料中的痕量汞,标准偏差为4%～8%,回收率为95.0%～100.0%.Mercury was fixed on fine silica gel particle as it complex with ammonium pyrrolidine dithiocarbamate （APDC） and the silica gel was collected on a membrane filter by filtration under suction. Then, the silica gel was washed down by using 0. 1 mol/L hydrochloric acid from membrane filter paper and the suspension was directly subjected to the determination by cold vapour-atomic absorption spectrometry （CV-AAS）. With 150 mL sample solution, characteristic mass was 1.5 × 10^-11 g/1%. With n=6, the relative standard deviations （RSDs） of these samples were from 40% to 8% and recoveries were 95.0% and 100.0%. The results were comparatively satisfactory.

关 键 词：汞 饮料 预富集 冷蒸气原子吸收光谱法 

分 类 号：O657.3[理学—分析化学]