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Further Work on the Determination of the Mineral Content of Soil Colloids
Author(s) -
Truog Emil
Publication year - 1936
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1936.036159950b1720010007x
Subject(s) - citation , content (measure theory) , work (physics) , computer science , library science , mathematics , engineering , mathematical analysis , mechanical engineering
The nine elements—O, Si. Al, Fe, Ca, Mg, Na, K, and Ti—combined largely In the form of silicates and oxides, make up about 98 per cent of the earth's crust. When Igneous rocks weather In humid temperate climates, the elements sodium and calcium form soluble salts and are lost in large amounts by leaching. It Is very significant that sodium and calcium do not form any resistant secondary minerals. Although considerable magnesium, silicon, and some potassium also leach away, these, along with the other four elements, form secondary oxides and silicates of such great stability that they persist as the minerals of the inorganic colloid fraction of soils. According to investigations to date, the minerals of this colloid fraction (less than O.OO01 mm. dia.) usually consist of the following: