极谱吸附催化波法连续测定微量铅、镉的方法  

Continuous Measurement for Trace Lead and Cadmium by PolargraphicAdsorption Catalytic Wave Method

作　　者：梁志芳[1] 魏利滨[2] 

机构地区：[1]唐钢矿业有限公司 [2]唐山学院

出　　处：《金属矿山》2003年第3期33-34,39,共3页Metal Mine

摘　　要：介绍了在 4%的醋酸 溴化钾 邻菲络啉 抗坏血酸 醋酸钠底液中 ,Pb2 +、Cd2 +与邻菲络啉、嗅化钾形成一多元配合物 ,可分别在 - 0 .5 3V(vs.SCE)、- 0 .74V(vs.SCE)处形成灵敏度很高的吸附极谱催化波 ,应用二阶导数法测定极谱峰电流。表明方法线性良好 ,Pb2 +、Cd2 +的检出限分别为 7.5 3 μg/L、0 .746μg/L ,方法的相对标准偏差为 1.10 %、3 .2 0 %。试验表明该法可以满足日用陶瓷中的溶出铅。In solution containing 4% acetic acid-patassium bromide-o-phenanthroline-ascorbic acid-sodium acetate,Pb 2+,Cd 2+ and O-phenanthroline and patassium bromide can form multielement coordinated polymer which may form adsorption polargraphic catalytic wave of high sensitivity at -0.53 V(vs.SCE) and -0.74 V(vs.SCE).Second order derivative method is used to measure the peak current of polargraphy.It is indicated that the method has a good linearity measurement limits of Pb 2+ and Cd 2+ which are 7.53 μg·L -1 and 0.746 μg·L -1 with the relative standard bias being 1.10% and 3.20% respectively.The test has shown that this method can meet the requirement of dissolved lead and cadmium measurement of ceramics for daily use.

关 键 词：极谱吸附催化波法 铅 镉 日用陶瓷 灵敏度 

分 类 号：TQ174.73[化学工程—陶瓷工业]