Journal
JOURNAL OF INORGANIC BIOCHEMISTRY
Volume 99, Issue 9, Pages 1788-1795Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jinorgbio.2005.06.024
Keywords
aluminium forms; speciation analysis; high performance liquid chromatography; forest soils; acidification
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Soil acidification promotes Al release from minerals and parent bedrocks; it also affects Al mobilization and speciation. Speciation of KCl extractable and water-extractable Al in forest soils was done by means of HPLC/IC method. Species Al3+ were the most abundant Al forms in the KCl extracts (around 93%). Prevailing Al forms (more than 70%) in aqueous extracts were AI(X)(1+), {i.e., Al(OH)(2)(+), Al(SO4)(+), AIF(2)(+), Al(oxalate)(+), Al(H-citrate)(+), etc.} species. It is assumed that most of KCl and water-2 extractable Al is bound in soil sorption complex (i.e., highly dispersed colloidal fraction of the soil solid phase creating negative charge) where majority of Al exists in the form of Al3+ species. The ECEC values, total carbon content and parameters related to soil organic matter composition (N and S content) have apparent effect on Al speciation. The most toxic Al3+ species are more concentrated in the B horizons compared to the A and E horizons. Aqueous extracts simulate Al release to soil solution under normal conditions; it can thus exhibit the actual Al toxicity. On the other hand, KCl extraction describes a potential threat for case of strong disturbance of natural soil conditions. (c) 2005 Elsevier Inc. All rights reserved.
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