超高灵敏显色反应及其应用的研究——Ⅴ.钨(Ⅴ)-SCN^--乙基罗丹明B-PVA-124体系  

Studies on Superhigh Sensitive Colour Reactions and Their Applications Ⅴ.Tungsten-Ethyl Rhodamine B-Thiocyanate System

作　　者：张红琴[1] 许生杰 

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《分析化学》1990年第11期987-991,共5页Chinese Journal of Analytical Chemistry

摘　　要：本文研究了在聚乙烯醇-124存在下,钨(V)-SCN^--乙基罗丹明B超高灵敏显色体系。缔合物λ_(max)=585nm,表观摩尔吸光系数ε_(585)=1.9×10~6L·mol^(-1)·cm^(-1)。钨浓度在0.1～1.5μg/25ml范围内符合比尔定律,方法曾用于水样及钢样中痕量钨的测定,结果较满意。A highly sensitive spectrophotometric method has been developed for the datermination of trace tungsten based on the formation of a complicated ion-association complex of tungsten with ethyl rhodamine B and thiocyanate in the presence of polyvinyl alcohol-124. The maximum absorption of the ion-association complex is at 585 nm and its apparent molar absorptivity is 1.9×10~6 L·mol^(-1)·cm^(-1)·Beet’s law is obeyed for tungsten in the range of 0～1.5 μg/25 ml. The interference of 31 diverse ions was studied.The proposed methcd has been used for the determination of trace tungsten in steel and water samples with satisfactory results.

关 键 词：钨 乙基罗丹明B 超高灵敏显色 

分 类 号：O614.613[理学—无机化学]