巯基棉富集分光光度法测定石煤渣中痕量钽  

Spectrophotometric determination of trace tantalum in stone coal slag after enrichment with sulfhydryl cotton

作　　者：罗道成[1] 刘俊峰[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《冶金分析》2010年第8期54-57,共4页Metallurgical Analysis

摘　　要：痕量钽（被巯基棉预富集后用分光光度法进行测定。在H2SO4介质中,Triton X-100存在下,钽（与丁基罗丹明B（BRB）发生显色反应,生成摩尔比为1∶1的稳定络合物,络合物的最大吸收波长为565 nm,表观摩尔吸光系数为1.46×105L.mol-1.cm-1,钽的质量浓度在0~600μg/L范围内符合比尔定律。经巯基棉富集后,钽的测定灵敏度可提高数倍,大量共存离子不干扰钽的测定。建立的方法应用于石煤渣中痕量钽的测定,分析结果的相对标准偏差小于5%,加标回收率在97%~103%之间。Trace tantalum was determined by spectrophotometry after pre-enriched with sulfhydryl cotton.The results showed that tantalum  reacted with butyl rhodamine B in H2SO4 medium in the presence of Triton X-100 to form a stable complex（1∶1） which had maximum absorption at 565 nm.The apparent molar absorptivity was 1.46×105 L·mol-1·cm-1.Beer＇s law was obeyed for tantalum  in the range of 0-600 μg/L.Its determination sensitivity was significantly improved after the enrichment with sulfhydryl cotton.Most of coexisting ions had no interference in the determination of tantalum .The proposed method was applied to the determination of trace tantalum in stonecoal slag,with the relative standard deviation（RSD） below 5 % and the recovery rate of 97 %-103 %.

关 键 词：巯基棉 分光光度法 丁基罗丹明B 钽 石煤渣 

分 类 号：P575[天文地球—矿物学]