石墨炉原子吸收光谱法间接测定海水中的微量硫酸根  

Indirect Determination of Trace Sulfate Ion in Sea Water by Graphite Furnace Atomic Absorption Spectrometry

作　　者：刘富平[1] 程祥圣[1] 葛建平[1] 

机构地区：[1]国家海洋局东海环境监测中心,上海市200137

出　　处：《光谱实验室》2006年第4期800-802,共3页Chinese Journal of Spectroscopy Laboratory

摘　　要：在盐酸介质中,硫酸根离子与过量的钡离子反应,生成BaSO4沉淀,离心分离后,过量的Ba2+经吡咯烷二硫代甲酸铵(APDC)和二乙氨基二硫代甲酸钠(DDTC)螯合,调节pH,用甲基异丁酮(MIBK)萃取后,用石墨炉原子吸收光谱法测定有机相中剩余钡的吸收信号,从而间接测得海水中的硫酸根离子,校准曲线线性范围为0.2—12μg·mL-1,相关系数r=0.998。对实际水样重复测定9次的相对标准偏差为6.9%,加标回收率为93.8%—103%。方法简便、快捷、重现性好,测定结果令人满意。In hydrochloric acid solution,SO4^2- reacts with excess Ba^2＋ to form BaSO4,which was separated by centrifuge. In a pH4. 0 buffered solution,surplus Ba^2＋ was chelateded by ammonium pyrrolidine dithiocarbamate （API）C） and sodium diethyl-dithiocarbamate（DDTC）,and extracted with MIBK. The barium in the organic phase was measured by graphite furnace AAS,and trace sulfate ranging from 0. 2 to 12μg·mL^-1 in aqueous solutions was determined indirectly with the relative standard deviation of 6. 9% and the recovery of 93. 8%-103%. The method was applied to the determination of SO4^2- in aqueous solutions with satisfactory results.

关 键 词：石墨炉原子吸收光谱法 海水 间接测定 硫酸根离子 

分 类 号：O657.31[理学—分析化学]