Analysis of mo and its high-purity compounds, with preconcentration of impurities

Autor:	S. S. Grazhulene, O. I. Charitonova, S. A. Poluyanova, Yu. I. Popandopulo
Rok vydání:	1982
Předmět:	Detection limit Polarography chemistry.chemical_compound Chromatography chemistry Hydrochloride Impurity Stationary phase Extraction (chemistry) Electrochemistry Analytical Chemistry
Zdroj:	Mikrochimica Acta. 77:231-242
ISSN:	1436-5073 0026-3672
DOI:	10.1007/bf01237811
Popis:	A procedure for concentrating microimpurities (especially W) in high-purity Mo by extraction chromatography (stationary phase trioctylammonium hydrochloride) has been developed. Extraction with 1-phenyl-3-methyl-4-benzoylpyrazol-5-one in molten naphthalenediphenyl mixture was also examined, but proved less useful. The extraction of W in the presence of macroamounts of Mo is suppressed in the extraction chromatography, allowing quantitative separation of these two elements. The electrochemical behaviour of Mo and W in each other's presence has been studied and a polarographic technique for determination of 10−6 M developed. The polarographic results for W are not affected by the presence of a 100-fold ratio of Mo. If the extraction chromatography and polarographic analysis are combined, the detection limit for W in Mo appears to be 10−5%.
Databáze:	OpenAIRE
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