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.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1990年第11期987-991,共5页
Chinese Journal of Analytical Chemistry
关键词
钨
乙基罗丹明B
超高灵敏显色
Superhigh sensitive colour reaction
Tungsten
Ethyl rhodamine B
