氢化物发生-原子荧光光谱法同时测定滑石中砷和汞

Simultaneous Determination of Arsenic and Mercury in Talcum by Hydride Generation-Atomic Fluorescence Spectrometry

摘要: 应用氢化物发生-原子荧光光谱法同时测定滑石中痕量砷和汞,并对样品的浸取方法及共存元素和实验条件进行了研究.结果表明,用浓盐酸浸取样品,砷、汞溶出量最大;加入硫脲-抗坏血酸溶液后,滑石中共存元素铝、铁、钙、铜、铅、镉不干扰砷、汞的测定.方法的检出限为砷0.047 mg/L,汞3.9 ng/L;回收率为砷107.5%～109.2%,汞103.3%～130.O%;精密度(RSD,n=11)为砷0.6%,汞0.7%.建立的氢化物发生-原子荧光光谱同时测定滑石中砷、汞含量的分析方法能满足日常检验的要求.

Abstract: A method for the simultaneous determination of arsenic and mercury in talclum by hydride generationatomic fluorescence spectrometry (HG-AFS) was established. Hydrochloric acid was used to dissolve the sample and the addition of thiourea-ascorbic acid can effectively eliminate the interference from coexisting elements such as Al, Fe, Ca, Cu, Pb, Cd in talclum. The detection limits of the method are 0.047 mg/L for As and 3.9 ng/L for Hg. The recoveries are 107.5％~109.2% for As and 103.3％~130.0% for Hg with the precision of 0.6%RSD for As and 0.7%RSD for Hg（n=11）. The method can be used in routine inspection of As and Hg in talclum samples.