氢化物发生—原子吸收分光光度测锡的方法研究

Determination of Tin by Hydride Generation-atomic Absorption Spectrometry

文章研究了氢化物发生—原子吸收分光光度法测定矿样中锡的方法,通过单因素实验分别选择了原子吸收分光光度计的最佳灯电流、燃烧器高度、狭缝宽度和燃气流量;氢化物发生测定锡时,溶液最佳盐酸浓度为0.5％,载液最佳酸度0.5 mol·L-1盐酸,NaBH4最佳浓度为1.5％.分别考察了共存元素Fe、Cu、Ni、Mn、Sb、Pb对锡测定的影响,方法测定线性范围30～80 ng·mL-1,线性相关系数r=0.999x,检出限为1.02 ng·mL-1,加标回收率为95.93 ％～98.76％,测定矿样相对标准偏差为0.40％.研究表明,该方法检出限低、精密度好、准确度高、干扰少,适合矿样中微量锡的测定.

The thesis studied on the determination of the content of tin in ore sample by hydride generation-atomic absorption spectrometry （HG-AAS）. Through single-factor experiments, the optimum lamp current, burner height, slit width and acetylene flow rat of atomic absorption spectrophotometer were determined. The optimum conditions of hydride generation of tin achieved by single factor experiments were 0.5 % HCI in solution, 0.5 mol·L^-1 HCI and 1.5 % NaBH4 in the carrier liquid. The interference in deten＇aination of Sn from coexistent elements Fe, Cu, Ni, Mn, Sb and Pb were investigated. Linearity of the calibration curve was ranged in 30-80 ng·L^-1 with correlation coefficient 0.999 × and the detection limit of 1.02 ng·L^-1 for Sn .The recovery of 95.93 %-98.76 % for Sn was obtained. The method has been used to determine Sn in ore sample with satisfactory result and the relative standard deviation （RSD） was 0.40 %.The result shows that this method has the advantages such as low detection limit, good precision, high accuracy and little interference, which was suitable for quantitative measurement of tin content in ore sample.