土壤样品中痕量价态金石墨炉原子吸收光谱法的测定及分离方法实验研究  

Experimental study of determination and separation methods of trace valence gold and stone ink in soil samples by atomic absorption spectrometry

作　　者：赵学沛[1] 王明军[1] 沙艳梅[1] 袁波 焦万里 ZHAO Xue-pei;WANG Ming-jun;SHA Yan-mei;YUAN Bo;JIAO Wan-li(No. 1 Geological Exploration Institute. Henan Provincial Bureau of Geological and Mineral Exploration, Nanyang 473000, China)

机构地区：[1]河南省地质矿产勘查开发局第一地质勘查院,河南南阳473000

出　　处：《岩石矿物学杂志》2019年第3期424-430,共7页Acta Petrologica et Mineralogica

基　　金：中国地质调查局地质矿产调查评价专项项目(121201004000160901-17)~~

摘　　要：在前人研究泡塑吸附金分离的基础上,用聚氨酯泡沫塑料吸附,利用石墨炉原子吸收法测定了痕量价态金的含量,探讨了溶矿介质、解脱时间、吸附温度、Fe^(3+)加入量等对测定结果的影响,确定了最佳测定条件,详细讨论了Fe^(3+)在溶矿和吸附过程中的作用,并将该方法用于土壤中痕量价态金的测定。方法检出限为0. 01 ng/g,测定范围为0. 03～300 ng/g,价态金回收率分别是Au^(3+)97. 3%、Au^+95. 8%、Au098. 9%,价态金分离精密度(RSD,n=12)为7. 3%～18. 8%。用石墨炉原子吸收光谱法测定价态金,不但有效地抑制了共存元素的干扰,而且能降低检出限,提高灵敏度和准确度,自动化进样减少了劳动强度,提高了分析测试效率,适合大批量样品的测试。The effects of dissolution medium,liberation time,adsorption temperature and Fe3+addition amount on the determination results were discussed in this paper. The best determination conditions were determined,and the role of Fe3+in ore dissolution and adsorption was discussed in detail. A trace amount of valence gold was separated and adsorbed by polyurethane foam. Gold was directly determined by graphite furnace atomic absorption spectrometry with thiourea solution to remove gold. The method is suitable for the determination of trace valence gold in stream sediments,soil and rocks. The detection limit of the method is 0. 01 ng/g,the determination range is 0. 03~ 300 ng/g,the recovery rates of valence gold are Au^3+97. 3%,Au^+95. 8%,Au098. 9%,respectively,and the separation precision( RSD,n = 12) of valence gold is 7. 3%~ 18. 8%. Determination of valence gold by graphite furnace atomic absorption spectrometry can not only effectively inhibit interference of coexisting elements,but also reduce detection limit and improve sensitivity and accuracy. Automatic sample introduction reduces labor intensity and improves analysis and testing efficiency,thus suitable for testing large quantities of samples.

关 键 词：痕量价态金 石墨炉原子吸收光谱法 聚氨酯泡沫塑料吸附:土壤 

分 类 号：N34[自然科学总论] P579[天文地球—矿物学]