Original scientific paper

N-Aryl Hydroxamic Acids as Gravimetric Reagents for Niobium and Tantalum

S. K. Agrawal ; Department of Chemistry, Ravishankar University, Raipur, 49 2-002 India
B. S . Chandravanshi ; Department of Chemistry, Ravishankar University, Raipur, 49 2-002 India
V. K. Gupta ; Department of Chemistry, Ravishankar University, Raipur, 49 2-002 India

Abstract

Twenty six newly synthesized N-aryl-hydroxamic acids have
been examined as reagents for gravimetric determination of niobium
and tantalum. N-Phenyl-p-ter-butylbenzohydroxamic acid was
found to be the most suitable rea~ent in the series examined and
is proposed for the separation and gravimetric determination of
niobium and tantalum. Niobium and tantalum are precipitated in
the pH range of 3.5-6.5 and 0.8-1.8 respectively. The niobium and
tantalum hydroxamates are ignited to oxides and weighed .as niobium
pentoxide and tantalum pentoxide. Niobium has also been
estimated by direct weighing of the niobium hydroxamate. Separation
of niobium and tantalum has been achieved using N-phenyl-
p-ter-butylbenzohydroxamic acid by adjusting the pH of precipitation,
without using any masking agent.

Keywords

Hrčak ID:

195953

URI

https://hrcak.srce.hr/195953

Publication date:

22.12.1978.

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