Distribution of titanic oxide upon the surface of the earth

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Abstract
AT the Ann Arbor meeting of the Association for the Advancement of Science in 1885, I read a short paper* which considered the occurrence of titanic oxide in considerable amount in certain soil of Albemarle 00., Va.; and in au article publish edt in 1888, by Mr. J. F. McOaleb and myself, we presented estimations of this substance in sixteen specimens of soil from scattered points of the United States.In view of the unfrequent mention of this element as a constituent of rocks and the very ral'e mention of its OCCUrl'ence in soils, I have endeavored to secure samples of soil and some rocks from points scattered over the earth's surface; and, including the befqre mentioned shteen, I herewith present the results of examining eighty specimens.The method employed in the recent determinations is the following: weigh into a platinum crucible one gram of the powdered sample, ignite, again weigh, then moisten with water and add 2 ur 3 c.c. of hydrofluoric acid,::: gradually heat to dryness, add about 7 grams of sodium acid sulphate, gradually heat to low redness for 1 or 2 hours, cool, digest in 5 per cent diluted sulplmdc acid for several hours, filter, to filtrate § add about 1 C.c. of hydrogen peroxide solution and compare the color so pl"Oduced with one similarly obtained from a standard solution of titanic oxide.
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openalex_W2319693749 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors F. P. Dunnington
Journal american journal of science
Year 1891
DOI
10.2475/ajs.s3-42.252.491
URL
https://doi.org/10.2475/ajs.s3-42.252.491
Keywords Keywords not found

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