APDC和氧化铝富集-冷原子吸收光谱法测定水产品中的痕量汞

Determination of mercury in water product by cold atomic absorption spectrometry after aluminum oxide the ammonium pyrrolidinedithiocarbamate complexes

用吡咯烷二硫代氨基甲酸铵(APDC)作配位剂,在pH=5.0～6.0的条件下,用氧化铝捕集、膜滤纸抽滤分离Hg-APDC配合物,然后用0.1moL/L盐酸从膜滤纸上洗下氧化铝,得到能够直接用冷原子吸收光谱法测定汞的悬浊液。该法特征质量为2.1×10-11g/1%。在最佳条件下,用这个方法测定了5种水产品中的痕量汞,当测定次数n=6时,标准偏差SD为0.0314～0.136,相对标准偏差RSD为1.67%～2.87%,样品的加标回收率在94.2%～101%之间,结果较为满意。

Using ammonium pyrrolidinedithiocarbamate （APDC） as complexant, under the condition of pH = 5.0- 6.0, the mercury was fixed on finely divided aluminum oxide as the complex with APDC and the aluminum oxide was collected on a membrane filter by filtration under suction, then wash down by 0.1 mol/L hydrochloric acid from membrane filter paper and the suspension was directly subjected to the determination by cold atomic absorption spectrometry. The quality feature was 2.1×10^-11 g/l% by the determination. At the prime conditions, determination of mercury in five species water products, when n = 6, standard deviation （SD） of these samples were 0.0314-0.136, relative standard deviation （RSD） were 1.67%-2.87% and recoveries added were 94.2%- 101% ,the results were comparatively satisfied.