Optimization of the gravimetric determination method of nickel as dimethylglyoximate for nickel raw materials |
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Authors: | P Junnila M Latvala R Matilainen and J Tummavuori |
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Institution: | (1) Outokumpu Harjavalta Metals Oy, FIN-29200 Harjavalta, Finland, FI;(2) University of Jyv?skyl?, Department of Chemistry, PO Box 35, FIN-40351 Jyv?skyl?, Finland, FI |
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Abstract: | The method parameters of an almost one century old method for analyzing nickel as dimethylglyoximate were critically examined
for the analysis of nickel raw materials and many of the method parameters were observed to have a significant effect on the
Ni recovery. Thus, because the Ni precipitation method parameters vary a lot in analytical literature and also in practice,
the obtained Ni results by different methods are not comparable. During this study it was found that the double precipitation
worked out perfectly in eliminating the effects of impurity elements. The residual Ni content in the filtrates should also
be measured to obtain accurate and precise Ni results. In complexing the impurity elements, tartaric acid, stabilized by acetic
acid, turned out to be effective, and when added to the sample solution before ammonium addition, the best pH conditions for
homogenous Ni precipitation with dimethylglyoxime were obtained. The optimized Ni determination method described was found
to be accurate and highly reproducible when tested with Ni concentrates and standard reference materials containing high Ni
concentrations.
Received: 26 December 1998 / Revised: 12 April 1999 / Accepted: 14 April 1999 |
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