高灵敏分光光度法测定微量铌

High Sensitive Spectrophotometric Method of Determing Trace Niobium

基于铌钼杂多酸与丁基罗丹明B(BRB)和聚乙烯醇(PVA)可以形成稳定的离子缔合物,建立了在水相中直接测定微量铌的新方法.研究了缔合物的形成条件,方法的灵敏度高,其ε值为 7.5×10~5L·mol^(-1)·cm^(-1),已成功地应用于钢中铌的测定.

A new sensitive Spectrophotometric method of directly determing microamounts of Niobium is estabilished in water. The method is based on the formation of the ion -association complex of Molybdoniobic acid with Butyle Rhodamine B (BRB) in the presence of Polyvinyl Alcohol (PVA). The formation conditions was studied. The method has high sensitivty. e=7. 5x 105 1. mol-1.cm-1. Thhe method has been applied to determina tion of trace Niobium ni steel.