Quantitative Determination of Water in Granites by Infra-Red Analysis

J. W. Aucott and M. Marshall
Department of Geology, The University, Durham
Department of Chemistry, The University, Bristol 8

Summary: Two methods using nujol and hexachloro-butadiene mulls are described to analyse the water content of powdered granite samples. The nujol mull analyses were carried out on a Unicam SP 100 spectrometer using the silica content of the rock as an internal standard. The hexachlorobutadiene mull analyses were done by a twin-path Unicam SP 200 spectrometer, using hexachlorobutadiene as the internal standard. The broader and more pronounced V1 vibrational mode (3450 cm−1) is ratioed to a standard of known composition. Comparisons are also made between absorption due to free water (V1 = 3450 cm−1) and combined water (V3 = 3680 cm−1) in aplites, biotite granite, and chlorite schists.

Mineralogical Magazine; June 1969 v. 37; no. 286; p. 256-261; DOI: 10.1180/minmag.1969.037.286.16
© 1969, The Mineralogical Society
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