摘要
在ＨＮＯ＿３·ＥＤＴＡ─ＦｅｚＯ＿３·Ｈ＿２ＳＯ＿４介质中，铌（Ⅴ）─氟化铵─酒石酸─偶氮胂（Ⅲ）体系形成灵敏的导数极谱催化波，峰电位在─０．８６Ｖ（ＶＳ·ＳＣＥ），Ｎｂ＿２Ｏ＿５量在０─２．５μｇ／２５ｍｌ范围内与峰电位成线性关系，拟定了一个不经分离，适用于硅酸盐，碳酸盐及化探样品中微量铌的测定方法。
In the medium of HNO_3·EDTA·Fe_2O_3·H2SO_4, a sensitive derivative polarographiccatalvtic wave formed in the system of niohum(Ⅴ)ammonium fluoride-tartaric acid-arsenazo(Ⅲ), the peak potential is -0.86v(VS.SCE), the content of Nb_2O_5 ranges in O-2.5μg/25ml, and it was a linear relationship between the peak potential and Nb_2O_5 amount. Thepaper put forward an analysis method of micro Nb(Ⅴ)in silicate, carbonate and geochemicalsamples without fractionated.
关键词
铌
酒石酸
氟化铵
硝酸
偶氮胂
极谱催化波
Niobium(Ⅴ)Tartaric acid Ammonium fluoride Nitric acid Arsenazo(Ⅲ)Derivative polarographic catalytic wave
