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Titolo:
SPECIATION AND SOLUBILITY CONTROL OF AL AND FE IN MINESOIL SOLUTIONS
Autore:
MONTERROSO C; ALVAREZ E; MACIAS F;
Indirizzi:
UNIV SANTIAGO,FAC BIOL,DEPT EDAFOL E-15706 SANTIAGO SPAIN
Titolo Testata:
Science of the total environment
fascicolo: 1-3, volume: 158, anno: 1994,
pagine: 31 - 43
SICI:
0048-9697(1994)158:1-3<31:SASCOA>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
GALICIA NW SPAIN; SURFACE WATERS; SOIL SOLUTIONS; ALUMINUM;
Keywords:
ALUMINUM; IRON; SPECIATION; MINESOILS; SOIL SOLUTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
C. Monterroso et al., "SPECIATION AND SOLUBILITY CONTROL OF AL AND FE IN MINESOIL SOLUTIONS", Science of the total environment, 158(1-3), 1994, pp. 31-43

Abstract

Solutions obtained from minesoils originating from the opencast lignite mine dump at As Pontes (Galicia, NW Spain) were studied. Spoils were very heterogeneous and there were a wide range of environments. Generally, solutions showed high electrical conductivity, often with largequantity of weathering products derived from pyrite oxidation (Fe, SO42-, H+), as well as Al and Si originating from mineral alteration. The Al fractioning showed (a) in the most acid areas (pH < 5.0) Al-SO4 was the dominant complex and Al3+ was the second most common; (b) at pHvalues between 5.0 and 6.0, Al-F monomers were the most abundant complexes; (c) at pH values > 6.0, Al-OH species were most common. The distribution of Fe species was chiefly determined by the Eh-pH conditionsand SO42- contents in the solution. Generally, in areas with a pH < 4.0 and Eh > 600 mV, Fe was found as Fe-SO4 4 complexes, while in areaswith a pH > 6.0 the only species present were Fe-hydroxy-monomers. The Al3+ activity in soil solution seems to be controlled by a jurbanite-type mineral at pH < 4.0, while amorphous Al(OH)(3) seems to exercisethis control at pH > 5.0. With regards to Fe, in the most acid (pH < 4.0) and oxidizing (pe < 9) environments, none of the minerals studied, could control their solubility, FeSO4.7H(2)O being the mineral phaseclosest to the equilibrium.

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Documento generato il 24/09/20 alle ore 05:18:30