铋-钨酸盐-罗丹明6G体系光度法测定痕量铋的研究  

Study on the Spectrophotometric Method for the Determination of Bismuth with Bismuth-Tungstate-Rhodamine 6G System

作　　者：林明卉 李志林 敬东阳 

机构地区：[1]云南氟业环保科技股份有限公司,昆明650021

出　　处：《云南化工》2015年第4期26-30,共5页Yunnan Chemical Technology

摘　　要：Bi（III）与钨酸盐及罗丹明6G 在硫酸介质中反应生成离子缔合物，该离子缔合物在550 nm 处有较强吸收，基于此现象，建立了一个测定痕量 Bi（III）的光度分析方法。该方法的线性范围为0．2-1．0μg ／L，摩尔吸光系数为7．27×10^7 L·mol ^－1·cm^ －1，检出限（以3倍空白值的标准偏差除工作曲线的斜率计算）为0．035μg ／L，而且常见离子基本上不干扰测定。将该方法用于自来水及环境水样中铋的测定，测定结果的相对标准偏差小于3．0％，加标回收率位于95-105％之间。A spectrophotometric method for the determination of Bi（III）was developed based on the ion-associated reaction among bismuth（III）,tungstate and butyl rhodamine 6G in H2 SO4 medium.The good linear relationship between the absorbance at 550 nm and the concentration of Bi（III）in the range of 0.2 -1.0 μg/L was obtained with the apparent molar absorptivity of 7.27 ×10^7 L·mol ^-1 ·cm^ -1 and limit of de-tection （obtained from 3σ/K.here,σis 3 times of the standard deviation of the blank value,and K is the slope of the working curve ）of 0.035 μg/L.The method,which was not interfered by most of the common i-ons,could be used for the determination of bismuth in running water and environmental water samples.The relative standard deviation of the results obtained by this method was below 3.0%,and the recovery was in the range of 95 -105%.

关 键 词：铋 罗丹明6G 离子缔合物 光度法 

分 类 号：TQ153.2[化学工程—电化学工业]