模拟微分分光光度法快速测定矿石中的微量锡  

RAPID DETERMINATION OF TRACE TIN IN ROCKS AND MINERALS BY ANALOG DERIVATIVE SPECTROPHOTOMETRY

作　　者：胡新成[1] 渠荣篯 曹国芳 赵中一[1] 何应律[1] 

机构地区：[1]武汉地质学院应用化学系 [2]安徽地矿局测试中心

出　　处：《分析化学》1989年第2期103-106,共4页Chinese Journal of Analytical Chemistry

摘　　要：在盐酸-酒石酸-Triton X-100介质中,水杨基萤光酮对锡有较高的灵敏度(ε_(503nm)=1.5×10~5)和较好的选择性,钨钼可允许比较大量存在,可以不经分离直接测定岩石矿物中低含量锡。四阶模拟微分的表观摩尔吸光系数ε_(490nm)=1.5×10~6(扫描速度120nm/min,峰零法),检出限为2.0ppb,样品分析的相对标准偏差为0.89%。The reagent salicylfluorone reacts with tin (Ⅳ) to form a complex having an absorption maximum at 503nm in the medium of chloride acid-tartaric acid-Triton X-100. The analog differentiation circuit was introduced in the derivative spectrophotometry system. The apparent molar absorptivity of fourth analog differentiation is found to be 1.5×10~6L·mol^(-1)·cm^(-1) at 490nm (scan rate 120nm/min). The proposed method has been used for direct determination of tin in rocks and minerals without preliminary separation. The detection limit is 2.0 ppb and the coefficient of variation 0.89％ (n=10).

关 键 词：矿石 分光光度法 模拟微分装置 锡 

分 类 号：P585.3[天文地球—岩石学]