电感耦合等离子体原子发射光谱法测定锡矿石中锡

分析锡含量的常用方法是极谱法,由于该方法在分析过程中需要使用汞,而汞常温下可蒸发为有剧毒的汞蒸气,因此有必要寻求一种安全、环保、快速的锡分析方法。本实验采用碱熔融法对锡矿石样品进行消解,建立了电感耦合等离子体原子发射光谱法(ICP-AES)对锡矿石中锡含量进行测定的方法。通过试验得出,采用过氧化钠熔样的最佳温度为670℃,熔样时间为7~10min,样品经热水提取后,经过30mL盐酸(1+1)进行酸化处理,然后采用1.00g酒石酸进行锡的络合,最后引入电感耦合等离子体原子发射光谱进行测定。采用实验方法对锡矿石标准物质GBW07281和GBW07282的检测结果与认定值基本相符,且测定结果的相对标准偏差(RSD,n=12)分别为1.8%和3.7%;对锡矿石实际样品进行测定,结果同传统的极谱法测定结果基本一致。实验方法满足矿山实验室准确快速的检测要求。

Determination of tin in tin ore by inductively coupled plasma atomic emission spectrometry

The common analysis method for tin content is polarography. However, mercury is used during analysis in this method. It can be evaporated to mercury vapor at room temperature with high toxicity. Therefore, it is necessary to seek a safe, environmentally friendly and rapid analysis method for tin. The tin ore sample was digested by alkali fusion. The determination method of tin content in tin ore by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established. The optimum sample fusion temperature with sodium peroxide was 670℃;the fusion time was 7-10min: after leaching with hot water, the sample was acidified with 30mL of hydrochloric acid (1+1) and tin was complexed using 1.00g of tartaric acid; finally the content of tin was determined by ICP-AES. The experimental method was applied for the determination of certified reference materials (GBW07281 and GBW07282), and the found results were basically consistent with the certified values. The relative standard deviation (RSD, n=12) was 1.8% and 3.7%, respectively. The actual samples of tin ore were determined according to the experimental method, and the found results were consistent with those obtained by traditional polarography. The proposed method could meet the requirements of rapid determination in ore laboratory.