Characteristics of Soluble and Exchangeable Acidity in an Extremely Acidified Acid Sulfate SoilEnglish Full Text

C. LIN;M. D. MELVILLE;N. VALENTINE(1School of Resource Science and Management, Southern Cross University, Lismore, NSW 2480 (Australia))(2School of Geography, The University of New South Wales, Sydney, NSW 2052 (Australia))(3SMEC Australia Pty Ltd, North

Abstract: An extremely acidified acid sulfate soil （ASS） was investigated to characterize its soluble and exchangeableacidity. The results showed that soluble acidity of a sample determined by titration with a KOH solutionwas much significantly greater than that indicated by pH measured using a PH meter, particularly for theextremely acidic soil samples. This is because the total soluble acidity of the extremely acidic soil sampleswas mainly composed of various soluble Al and Fe species, possibly in forms of Al sulfate complexes （e.g.,AISO4） and ferrous Fe （Fe2+）. It is therefore suggested not to use pH alone as an indicator of soluble acidityin ASS, particularly for extremely acidic ASS. It is also likely that AISO4+ actively pericipated in cationexchange reactions. It appears that the possible involvement of this Al sulfate canon in the canon adsorptionhas significant effect on increasing the amount of acidity being adsorbed by the soils.

Keywords：

acid sulfate soils; aluminium sulfate complex; exchangeable acidity; hydrolysis; soluble acidity;

Series：
(D) Agriculture; (A) Mathematics/ Physics/ Mechanics/ Astronomy
Subject：
Physical Geography and Topography; Fundamental Science of Agriculture; Agronomy
Classification Code：
S156.41

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Characteristics of Soluble and Exchangeable Acidity in an Extremely Acidified Acid Sulfate SoilEnglish Full Text

C. LIN;M. D. MELVILLE;N. VALENTINE(1School of Resource Science and Management, Southern Cross University, Lismore, NSW 2480 (Australia))(2School of Geography, The University of New South Wales, Sydney, NSW 2052 (Australia))(3SMEC Australia Pty Ltd, North

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