Publication Date:
1963-07-01
Description:
The triethanolamine — BaCl2 (pH 8.1), 1N NH4C2H3O2 (pH 7 and 4.8), 1N Ba(C2H3O2)2 (pH 7) and unbuffered 1N KCl methods for evaluating total exchange acidity in soils were compared. The general order of extracting ability was found to be triethanolamine — BaCl2 (pH 8.1 〉 1N NH4C2H3O2 (pH 7) = 1N Ba(C2H3O2)2 (pH 7) 〉 1N KCl for kaolinite clays and organic matter where variations in results were largely attributable to the exchange acidity held by charges from pH-dependent exchange sites. Although less pronounced, the general order of extracting ability for montmorillonites, where most of the exchange acidity is held by charges from permanent exchange sites, was found to be triethanolamine — BaCl2 pH 8.1) 〉 1N KCl 〉 1N NH4C2H3O2 (pH 7) = 1N Ba(C2H3O2)2 (pH 7). Only the triethanolamine-BaCl2 method gave substantially higher results for illite clays.All solutions, with the exception of 1N NH4C2H3O2 (pH 4.8), removed only small portions of exchangeable aluminium from the materials studied although equivalent amounts of hydrogen were released. The 1N NH4C2H3O2 (pH 4.8) method was the best technique tested for removal of exchangeable aluminium although its suitability remains somewhat doubtful.Variations in the quantitative amounts of exchange acidity found by different methods in some common Alberta soils can be explained by inferences made from the results obtained for the standard samples of known competition.
Print ISSN:
0008-4271
Electronic ISSN:
1918-1841
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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