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The separation of manganese in rock analysis

Published online by Cambridge University Press:  14 March 2018

E. V. Holt  and
H. F. Harwood
E. V. Holt
Affiliation:
Department of Chemistry, Imperial College of Science and Technology, London
H. F. Harwood
Affiliation:
Department of Chemistry, Imperial College of Science and Technology, London
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Extract

The separation and estimation of small quantities of manganese in the course of exact analysis of igneous and metamorphic rocks has long presented a difficulty. The element is almost universally present, in amounts varying from a few hundredths of one per cent. to over one per cent., the higher figure being reached in the basic rocks, especially in those rich in ferromagnesian minerals. In the ordinary course of analysis, if no special method be adopted to separate and remove manganese, this element tends to be distributed between the 'ammonia precipitate' and the lime and magnesia. It has been shown by G. Steiger that when the usual methods are employed, the manganese tends to be distributed in a quite haphazard way among the three precipitates; no definite proportion is retained by any one of them, although as a general rule most of the manganese is found with the magnesia and least with the lime.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 21 , Issue 118 , September 1927 , pp. 318 - 323
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1927

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References

page 318 note 1 Hillebrand, W. F., The analysis of silicate and carbonate rocks. Bull. U.S. Geol. Survey, 1907, no. 305, p. 96 Google Scholar.

page 320 note 1 H. S. Washington, Manual of the chemical analysis of rooks. 3rd edition, 1919, p. 151.

page 321 note 1 After concentration of the solution and removal of the small amount of alumina still present (vide W. F. Hillebrand, The analysis of silicate and carbonate rocks. Bull. U.S. Geol. Survey, 1919, no. 700, p. 114).

page 321 note 2 Free acid is produced in the reaction, and it is essential to add sufficient ammonia to ensure the liquid remaining alkaline throughout, the precipitation.