On the Determination of Ferrous Iron in Rock Analysis
On the Determination of Ferrous Iron in Rock Analysis
Robert Mauzelius
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(A) and two samples of fine- ground material (B and C) were j decomposed with 10-normal sulphuric acid in sealed pieces of the same glass tube filled with carbon dioxide. Weight of sample Loss of weight Ferrous Iron dried at 105. At 105. Found. A. 0. 6181 0, 03 20, 33 B. 1 0, 7597 1, 11 17, 54 C. 1 0, 5702 2, 03 17, 38 Hornblende from Uppsala Granite. Sp. Gr. 8, 20 3, 26. The determinations were carried out according to PRATT'S method, partly on material with grains of the size of 0, is 0, 26 m...m. (A), partly on fine-ground material (B and C). A "Weight of sample dried at 105. 0, 3066 Loss of weight at 105. not determined Ferrous Iron found. 15, 57 B 0, 3021 3391 0, 53 15, 80 15, 05 C 0, 3471 0, 69 14, 70 Both minerals were consequently oxidized by the grind- rig. As however the result as far as the hornblende is concerned cannot be considered fullv conclusive and the 1 These two determinations were carried out on different clays and therefore the figures are not quite comparable for hygroscopic moisture.
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