Modeling the distribution of aluminum speciation in acid soil solution equilibria with the mineral phase alunite

Citation
Sp. Bi et al., Modeling the distribution of aluminum speciation in acid soil solution equilibria with the mineral phase alunite, ENVIR GEOL, 41(1-2), 2001, pp. 25-36
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
ENVIRONMENTAL GEOLOGY
ISSN journal
0943-0105 → ACNP
Volume
41
Issue
1-2
Year of publication
2001
Pages
25 - 36
Database
ISI
SICI code
0943-0105(200111)41:1-2<25:MTDOAS>2.0.ZU;2-T
Abstract
This paper reports the modeling of the distribution of aluminum (Al) specia tion in acid soil solution equilibria with the mineral phase alunite. It is based on thermodynamic calculation using Turbo C++ language to write the c omputer program. Dependence of distribution of Al speciation on pH was inve stigated, including Al3+, Al(OH)(2+), Al(OH)(2)(+), Al(OH)(4)(-), Al-F, Al- SO4, Al-Org, Al-PO4, and Al-ploy, as well as total Al concentrations. Influ ences of the various factors such as C*(SO4), C*(K), C*(F), and DOC (dissol ved organic carbon) on Al speciation were also inspected. Comparisons with gibbsite and other Al oxysulfate minerals such as jurbanite/basaluminite we re performed. Some unique characteristics were discovered: for example, the SO42- concentration has a remarkable influence on the distribution of Al s peciation, and the toxicity of Al is not a major factor in the soil solutio ns' equilibria with alunite. Results for application to the practical analy sis of Al speciation in real soil solutions are reported.