摘要
建立了镉-碘化钾-罗丹明B高灵敏显色体系,在聚乙烯醇存在下,0.12mol·L^-1硫酸时,Cd^2+和I^-及罗丹明B形成三元显色络合物,稳定时间可达1h。镉离子的质量浓度在0~3μg/25mL时服从比耳定律,ε605=6.84×10^5L·mol^-1·cm矗。。用于测定湖水中镉的含量,测量结果的相对标准偏差值均小于0.6%,加标回收率在98.2%-100.1%之间。
In a sulfuric acid solution of 0. 12 mol . L^-1 and in the presence of PVA, a ternary complex was formed among Cd(Ⅱ ), KI and rhodamine B, which was stable for at least 1 k Beer's law was held in the range of 0--3 μg/25 ML of Cd( Ⅱ), giving the molar absorptivity (ε) 6.84× 10^5L .mol^-1. cm^-1 at its absorption maxima of 605nm. It its application to the determination of cadmium in lake water. RSD's of the analytical results were less than 0. 6%, and recoveries found were in the range of 98.2%--100. 1%
出处
《理化检验(化学分册)》
CAS
CSCD
北大核心
2006年第9期719-720,共2页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
光度法
镉(Ⅱ)
碘化钾
罗丹明B
湖水
Photometry
Cadmium( Ⅱ)
Potassium iodide
Rhodamine B
Lake water