Extraction-Spectrophotometric Determination of Niobium in Steels and Columbite using Metoclopramide and Thiocyanate*
Corresponding Author(s) : P. G. Ramappa
Asian Journal of Chemistry,
Vol. 1 No. 1 (1989): Vol 1 Issue 1
Abstract
A method for the spectrophotometric determination of niobium(V) is proposed, in which niobium(V) is extracted into dichloromethane from 2-3 M hydrochloric acid containing potassium thiocyanate and metoclopramide hydrochloride (MCH). The molar absorptivity of the extracted complex is 2.2Zx 104 l mol–1 cm–1 at 385 nm. Beer's law is obeyed over the range 0.5 to 3.5 μg ml–1 of Nb(V). The proposed method permits the determination of niobium(V) at trace levels in the presence of large amounts of other ions. The method has been applied to the determination of niobium in steels and columbite or with high accuracy.
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