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Hydroxylamine and Ammonium Oxalate Solutions as Extractants for Iron and Aluminum from Soils
Author(s) -
Ross G. J.,
Wang C.,
Schuppli P. A.
Publication year - 1985
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/sssaj1985.03615995004900030051x
Subject(s) - hydroxylamine , ammonium oxalate , extraction (chemistry) , oxalate , chemistry , ammonium , nuclear chemistry , dissolution , inorganic chemistry , oxalic acid , chromatography , organic chemistry
A comparison was made of acid hydroxylamine and acid ammonium oxalate methods for extracting Fe and Al from three clay mineral (chlorite) samples and 27 soil samples. Although the hydroxylamine solution was more acid than the oxalate solution, the hydroxylamine extraction did not increase dissolution of the chlorites markedly. It was concluded that overnight hydroxylamine extraction at room temperature using a 1:250 soil‐to‐solution ratio can be used as an alternative method to the 4‐h oxalate extraction method with the 1:40 soil‐to‐solution ratio commonly used in soil studies. This conclusion was based on the following reasons: (i) the results from both methods were comparable for nearly all samples; (ii) hydroxylamine solutions were more easily analyzed than oxalate solutions by atomic absorption analysis; (iii) overnight hydroxylamine extraction at room temperature required no specialized heating baths with compatible shaking equipment and is therefore suitable for most laboratories.