L-半胱氨酸预还原断续流动-HG-AFS法同时测定纺织品中微量砷和锑

采用L-半胱氨酸为预还原剂,建立了断续流动进样氢化物发生-原子荧光光谱法同时测定纺织品中微量砷和锑的方法.并确定了仪器的最佳工作条件,考察了介质和载流酸度、硼氢化钠浓度、L-半胱氨酸浓度和载流流速的影响以及共存元素的干扰情况.方法简便、快速.在选定的测定条件下,砷和锑的检出限分别为0.35和0.22μg·L-1,相对标准偏差分别为1.3%和2.8%,回收率分别为93.6%～98.4%和92.2%～103.6%.

Simultaneous Determination of Trace Arsenic and Antimony in Textile by Intermittent Flow-Hydride Generation-Atomic Fluorescence Spectrometry with L-Cysteine as a Prereducer

A method for the simultaneous determination of trace arsenic and antimony in textile by intermittent flow-hydride generation-atomic fluorescence spectrometry with L-cysteine as a prereducer was developed. The optimal instrument condition was established. The influence factors such as the acidity of sample solution and carrier liquid, the concentrations of KBH4 and L-cysteine, the flow rate of carrier, and the interference of coexistent elements were investigated. The method was convenient and rapid. Under the optimal condition, the detection limits were 0.35 and 0.22 microg x L(-1), the relative standard deviations were 1.3% and 2.8%, and the recoveries were in the ranges of 93.6% - 98.4% and 92.2% - 103.6% for As and Sb respectively.