铋膜电极微分电位溶出法测定矿区土壤中锡  

Determination of tin in soil of ore locus by differential potentiometric stripping analysis using bismuth-film electrode

作　　者：高云涛[1] 刘琼[1] 李乔丽[1] 放茂良[1] 周学进[1] 陈树莲[1] 

机构地区：[1]云南民族大学化学与生物技术学院,云南昆明650031

出　　处：《冶金分析》2010年第11期20-24,共5页Metallurgical Analysis

基　　金：NSFC-云南联合基金资助项目(U0833603)

摘　　要：研究了以镀铋膜电极替代镀汞膜电极测定锡的微分电位溶出分析法（DPSA）,考察了测定锡的条件。结果表明,在富集电位为-1.2 V,清洗电位为0.50 V,草酸浓度为0.15 mol/L,CTMAB浓度为6.0×10-5mol/L的条件下,锡在镀铋膜电极上可产生灵敏的微分电位溶出峰,峰高与锡浓度在0~100.0μg/L范围呈线性,溶出电位为-0.54 V（vs.SCE）,共存的铅不干扰锡的测定。建立的方法已用于矿区土壤中锡的测定,测定结果的相对标准偏差为2.4%~8.7%,加标回收率在98.5%~110%间。The determination of tin by differential potentiometric stripping analysis（DPSA） was studied using bismuth film electrode to replace mercury film electrode.The determination conditions were investigated.The results showed that tin could generate sensitive differential potentiometric stripping peak on bismuth film electrode under the following conditions： enrichment potential of-1.2 V,cleaning potential of 0.50 V,0.15 mol/L oxalic acid,and 6.0×10-5 mol/L CTMAB.The peak height showed linearity to the concentration of tin in the range of 0-100.0 μg/L.The stripping potential was-0.54 V（vs.SCE）.The coexisting lead did not interference with the determination.This method has been applied to the determination of tin in soil of ore locus with the relative standard deviations（RSD） of 2.4 %-8.7 % and the standard addition recoveries of 98.5 %-110.0 %.

关 键 词：矿区土壤 微分电位溶出法 铋膜电极 锡 

分 类 号：X833[环境科学与工程—环境工程]