碘化物升华分离-电感耦合等离子体光谱法测定土壤和沉积物中砷、锑、铋、镉、锡  

Determination of As,Sb,Bi,Cd and Sn in Soils and Sediments by Inductively Coupled Plasma Atomic Emission Spectrometry after Sublimation Separation as Iodides

作　　者：何红蓼[1] 胡明月[1] 巩爱华[1] 温宏利[1] 阙松娇[1] 

机构地区：[1]国家地质实验测试中心,北京100037

出　　处：《光谱学与光谱分析》2008年第3期663-666,共4页Spectroscopy and Spectral Analysis

基　　金：国土资源部地质大调查项目(20026019)资助

摘　　要：将土壤或水系沉积物样品与固体NH4I按1:0·25的比例在双球玻璃管中混匀后在苯灯喷焰上加热,使样品中的As,Sb,Bi,Cd和Sn转变为碘化物升华逸出而与基体分离,挥发物用盐酸溶解后用电感耦合等离子体光谱法(ICP-AES)测定。实验探讨了NH4I的用量、挥发和溶解条件,光谱测定条件,内标选择,测定谱线选择及背景和谱线干扰校正。用土壤和水系沉积物国家一级标准物质验证了方法的准确性和精密度,测定结果与标准值吻合。方法快速简便,结果可靠,检出限为0·01～0·35μg·g-1,适用于地球化学勘探大批量土壤和沉积物样品中As,Sb,Bi,Cd和Sn的测定。A method was developed for the determination of As,Sb,Bi,Cd and Sn in soils and sediments for geochemical exploration purposes.Sample powder was mixed with NH4I and heated at-800 ℃,iodides of As,Sb,Bi,Cd and Sn were formed and sublimated from the sample matrix and then extracted by diluted HCl.The prepared solution was determined by ICP-AES.The sample treatment procedure,such as the ratio of NH4I to sample,and sublimation and extraction conditions,was studied.The instrument determination parameters,including ICP power,Ar gas flow rate,spectral wavelengths,background subtraction,spectral interferences correction and internal standard,were selected and optimized.The established procedure is rapid and simple,the detection limits for the five elements are in the range of 0.01-0.35 μg·g^-1,and the analytical results for soil and sediment reference materials were in good agreement with the reference values.

关 键 词：电感耦合等离子体光谱法(ICP-AES) 碘化物升华 土壤 水系沉积物 As SB Bi Cd SN 

分 类 号：S151.9[农业科学—土壤学]