POLAROGRAPHIC INVESTIGATION OF SOME NIOBIUM COMPLEXES
Journal Article
·
· Dissertation Abstr.
OSTI ID:4827616
A detailed polarographic and kinetic study was applied to some complexes of niobium and tantalum. The polarographic behavior of the first reduction step of the niobiumEDTA complex was thoroughly investigated and found to be a reversible, one electron reduction over the range of pH studied, from 0.3 to 6.0, with a slight amount of irreversibility appcaring in the upper pH region due to low buffer capacity of the solution. The half-wave potential varied linearly with pH in three pH regions, indicating the involvement of one hydrogen ion in the pH region from 0.3 to 2; two hydrogen ions from pH 2 to 3.l; and 2.5 hydrogen ions from pH 3.4 to 5.7. The half-wave potential was not affected by EDTA concertration in a well buffered solution. The temperature coefficient of the half-wave potential was --1.3 mv per degree and that of the diffusion current was linearly proportional to the niobium concentration over the concentration range of 0.5 to 1000 mu g niobium per ml. A kinetic study showed that the formation of the reducible Nb-EDTA complex consists of two parallel first order reactions with respect to niobium; one Nb-EDTA species depends upon EDTA /sup 1/2/ H/ sup +1/2/ and the other depends upon STAEDTA!/sup -1/2/ STAH/sup +/! /sup - 1/2/. AN investigation of a similar nature was carried out for the niobium- hydroxyethylethylenediamine triacetic acid complex. A method was described for testing complexing reagents with niobium. The tantalumEDTA complex was prepared and studied polarographically.
- Research Organization:
- Univ. of Arizona, Tucson
- NSA Number:
- NSA-16-022087
- OSTI ID:
- 4827616
- Journal Information:
- Dissertation Abstr., Journal Name: Dissertation Abstr. Vol. Vol: 22
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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