Competitive sorption of molybdate and phosphate in Andisols

We have examined the effects of both pH and phosphate concentrations on molybdate sorption by four Chilean Andisols with varying chemical properties. For both anions adsorption decreased with an increase in soil pH and also with organic matter content in the soils. In general, more phosphate than mo...

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Autores principales:	Vistoso,E, Theng,B.K.G, Bolan,N.S, Parfitt,R.L, Mora,M.L
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2012
Materias:	Andisol Competitive sorption Molybdate Phosphate pH
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162012000100006
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spelling	oai:scielo:S0718-951620120001000062018-11-05Competitive sorption of molybdate and phosphate in AndisolsVistoso,ETheng,B.K.GBolan,N.SParfitt,R.LMora,M.L Andisol Competitive sorption Molybdate Phosphate pH We have examined the effects of both pH and phosphate concentrations on molybdate sorption by four Chilean Andisols with varying chemical properties. For both anions adsorption decreased with an increase in soil pH and also with organic matter content in the soils. In general, more phosphate than molybdate was sorbed by the soils. The Freundlich equation adequately described adsorption of both anions. Differences in the extent of sorption of molybdate and phosphate and in isotherm shape between soils were ascribed to variations in soil properties. The competitive sorp-tion data were adequately described by the multicomponent Freundlich equations. Phosphate strongly competed with molybdate for sorption sites on the Andisols, causing molybdate sorption to decrease by 10-27%. The competition coefficients for phosphate and molybdate sorption were variable, indicating that competition between the two anions was not symmetrical. The present results provide further evidence to indicate that the surfaces of Andisols are rich in reactive Al-OH and Fe-OH groups, exposed at colloidal particle surfaces. Molybdate sorption appeared to be mainly associated with free Al- and Fe-oxides, while phosphate sorption was primarily regulated by Al- and Fe-humus complexes.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.12 n.1 20122012-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162012000100006en10.4067/S0718-95162012000100006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Andisol Competitive sorption Molybdate Phosphate pH
spellingShingle	Andisol Competitive sorption Molybdate Phosphate pH Vistoso,E Theng,B.K.G Bolan,N.S Parfitt,R.L Mora,M.L Competitive sorption of molybdate and phosphate in Andisols
description	We have examined the effects of both pH and phosphate concentrations on molybdate sorption by four Chilean Andisols with varying chemical properties. For both anions adsorption decreased with an increase in soil pH and also with organic matter content in the soils. In general, more phosphate than molybdate was sorbed by the soils. The Freundlich equation adequately described adsorption of both anions. Differences in the extent of sorption of molybdate and phosphate and in isotherm shape between soils were ascribed to variations in soil properties. The competitive sorp-tion data were adequately described by the multicomponent Freundlich equations. Phosphate strongly competed with molybdate for sorption sites on the Andisols, causing molybdate sorption to decrease by 10-27%. The competition coefficients for phosphate and molybdate sorption were variable, indicating that competition between the two anions was not symmetrical. The present results provide further evidence to indicate that the surfaces of Andisols are rich in reactive Al-OH and Fe-OH groups, exposed at colloidal particle surfaces. Molybdate sorption appeared to be mainly associated with free Al- and Fe-oxides, while phosphate sorption was primarily regulated by Al- and Fe-humus complexes.
author	Vistoso,E Theng,B.K.G Bolan,N.S Parfitt,R.L Mora,M.L
author_facet	Vistoso,E Theng,B.K.G Bolan,N.S Parfitt,R.L Mora,M.L
author_sort	Vistoso,E
title	Competitive sorption of molybdate and phosphate in Andisols
title_short	Competitive sorption of molybdate and phosphate in Andisols
title_full	Competitive sorption of molybdate and phosphate in Andisols
title_fullStr	Competitive sorption of molybdate and phosphate in Andisols
title_full_unstemmed	Competitive sorption of molybdate and phosphate in Andisols
title_sort	competitive sorption of molybdate and phosphate in andisols
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162012000100006
work_keys_str_mv	AT vistosoe competitivesorptionofmolybdateandphosphateinandisols AT thengbkg competitivesorptionofmolybdateandphosphateinandisols AT bolanns competitivesorptionofmolybdateandphosphateinandisols AT parfittrl competitivesorptionofmolybdateandphosphateinandisols AT moraml competitivesorptionofmolybdateandphosphateinandisols
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Competitive sorption of molybdate and phosphate in Andisols

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