地质样品中痕量铊的纸色谱法分离-分光光度法测定  

Determination of Trace Thallium in Geological Samples by Paper Chromatography with Spectrophotometric Detection

作　　者：吴惠明[1] 陈永亨[1] 刘浓[1] 

机构地区：[1]广州大学生物与化学工程学院化学系,广东广州510405

出　　处：《分析测试学报》2003年第4期86-88,共3页Journal of Instrumental Analysis

基　　金：广东省自然科学基金资助项目 (980383) ;广东省重点科技攻关项目 (99M05301G)

摘　　要：研究了甲基异丁基酮、乙醇、氢溴酸3种试剂混合成均相的展开体系中,色谱纸吸附Tl及Na2SO3 解脱Tl的诸条件 ,使Tl与干扰元素分离而预富集 ,回收率在98 %～102% ;准确测定了硫化矿和土壤中的Tl;考察了2个样品测定5次的相对标准偏差小于4 % ,试样分析结果与等离子质谱法、泡沫塑料及活性炭吸附分离 -镉试剂2B光度法基本一致。Amethod of thalliumquantification in geological samples was established by spectrophotometry.Thallium can be separated from interfering ions using chromatographic paper as an adsorbing substance and sodium sulfite as a de_absorbing substance in methyl_isobutylketone(MIBK)-alcohol-hydrobromic acid media.Trace amounts of thalliumin geological samples can be determined spectrophotometrically using cadion2B as a color reagent.Beer's lawis obeyed in the mass concentration range of0～1000μg/L of thallium.The method has been applied to deˉtermine trace thallium in sulphidizing mineral and soil samples.The recoveries of standard addition were98%～102%.The results were in agreement with those provided by ICP-MS,cadion2B spectrophotometry with polyurethane foam adsorption and activated carbon separation.The RSD of the method is less than4%(n=5).

关 键 词：地质样品 痕量铊 分离 富集 纸色谱法 分光光度法 测定 矿物 

分 类 号：P575[天文地球—矿物学]