氢化物发生-电感耦合等离子光谱法测定4A沸石中微量砷

Determination of trace arsenic in 4A zeolite by HG-ICP-AES

建立以氢化物发生-等离子体发射光谱法测定4A型沸石中砷含量的方法。研究了介质酸度。硅、铝、钠基体和硼氢化钠用量对砷测定的影响。以硫脲-抗坏血酸为掩蔽剂，消除干扰元素的影响。在试验确定的最佳分析条件下可获得准确、可靠的分析结果。砷的检出限为0．1μg／g，相对标准偏差（RSD）为2．0％，回收率在94％～104％之间。

A new method was developed for the determination of trace arsenic in 4A Zeolite by hydride generation inductively coupled plasma atom emission spectrometry （HG - ICP- AES）. The experimental conditions such as concentrations of sodium borohydride and digestion acid were optimized. Thiourea and Vitamine C were used to mask the interferences of other elements. Under the optimal condition, the detection limit of arsenic was found to be 0. 1μg/g . The RSD was less than 2%. In its application to the determination of Arsenic in 4A Zeolite, recoveries in the range from 94% to 104% were obtained.