活性炭吸附分离-分光光度法测定硫化矿和土壤中的痕量铊  

Spectrophotometric Determination of Trace Thallium in Geological Samples Using Activated Carbon as an Adsorption-separation Material

作　　者：吴惠明[1] 郭慧清[1] 陈永亨[1] 陈银英[1] 郑燕鹏[1] 

机构地区：[1]广州大学桂花岗校区化学系,广东广州510405

出　　处：《岩矿测试》2001年第4期275-278,共4页Rock and Mineral Analysis

基　　金：广东省自然科学基金 ( 980 3 83 ) ;广东省重点科技攻关项目 ( 99M 0 5 3 0 1G)

摘　　要：详细研究并确定了在HCl介质中 ,活性炭吸附Tl及草酸铵解吸Tl的诸条件 ,使Tl与干扰元素分离而预富集 ,回收率在 99.6 %～ 1 1 6 .3 %。以镉试剂 2B为显色剂 ,准确测定了硫化矿和土壤中的Tl。考察了两个样品测定 5次的相对标准偏差 <6 % ,试样分析结果与原子吸收法、等离子体质谱法及泡沫塑料吸附分离 -镉试剂 2B光度法结果基本一致。A method of thallium quantification by spectrophotometry is established. Thallium can be separated from interfering ions using activated carbon as an adsorbing substance and ammonium oxalate as a de adsorbing substance in hydrochloric acid media. Trace amounts of thallium in geological samples can be determined spectrophotometrically using Cadion 2B as color reagent. Beer's law is obeyed in the mass concentration range of 0～1?000?μg/L of thallium. The method has been applied to determination of trace thallium in two geological samples.The recoveries of standard additions are 99.6%～116.3%. The results are in agreement with those provided by AAS,ICP MS, Cadion 2B spectrophotometry with pllyurethane foam separation. The precision of the method is less than 6% RSD ( n =5).

关 键 词：铊 活性炭 分离 富集 分光光度法 土壤 硫化矿 吸附法 

分 类 号：O614.373[理学—无机化学] O657.32[理学—化学]