Hg^(2+)-碘化物-番红花红T缔合体系褪色光度法测定微量汞  

Fading Spectrophotometric Determination of Trace Mercury with Hg^(2+)-Iodide-Safranine T Complex System

作　　者：李人宇[1,2] 李咏梅[2,3] 吴俊杰[1] 熊情[1] 

机构地区：[1]连云港师范高等专科学校,江苏连云港222006 [2]淮海工学院江苏省海洋资源开发研究院,江苏连云港222005 [3]淮海工学院化学工程学院,江苏连云港222005

出　　处：《岩矿测试》2010年第4期461-464,共4页Rock and Mineral Analysis

基　　金：连云港市科技项目资助(SH0816);江苏省海洋资源开发研究院科技开放基金项目资助(JSIMR09C08)

摘　　要：在0.01 mol/L硫酸介质中,Hg2+与过量I-和番红花红T(ST)反应生成稳定的离子缔合物[ST]2[HgI4],使ST褪色,据此建立了褪色光度法测定微量汞的方法。最大褪色波长为519 nm,体系的褪色程度与Hg2+浓度在0~1.35μg/mL内呈线性关系,表观摩尔吸光系数为1.24×105L/(mol.cm),检出限为2.26μg/L。采用巯基棉富集分离,测定河水中的微量汞,方法相对标准偏差(RSD,n=5)为1.2%~1.7%,回收率为98.3%~102.6%。A fading spectrophotometric method for the determination of trace mercury has been developed.In 0.01 mol/L H2SO4 medium,Hg2＋ reacts with excess I-and safranine T（ST） to form a stable ion-association complex（2）,which leads to the fading of ST.The maximum fading wavelength locates at 519 nm.The fading degree of the system is linear with the concentration of Hg2＋ in the range of 0~1.35 μg/mL.Apparent molar absorption coefficient is 1.24×105 L/（mol·cm） with detection limit of 2.26 μg/L for mercury.Recoveries of Hg2＋ are 98.3%~102.6% with precision of 1.2%~1.7% RSD（n=5）.The method has been applied in the determination of trace mercury in river water samples after enrichment and separation with thiol cotton fiber.

关 键 词：褪色光度法 汞 碘化物 番红花红T 离子缔合物 

分 类 号：O657.32[理学—分析化学] O614.243[理学—化学]