Cadmium sorption-desorption by soils in the absence and presence of phosphate
Batch experiments were carried out to determine the effect of phosphate anion (P) on the sorption-desorption of cadmium (Cd). The soils selected for the study were two kaolinitic Alfisols and two Andisols, which differ in their variable charge components. At the natural soil pH, Cd sorption in the absence of P was related to the net negative surface charge of the soils. Sorption of P increased the negative charge of the soils but the increase per unit amount of P added decreased with increasing P sorption. Both pH and soil characteristics influence the effect of P on Cd reactions. In the Alfisols, P and Cd were sorbed in similar amounts and the effect of increasing P rates on Cd sorption-desorption reactions was negligible. In the allophanic Andisols, whose capacity to bind P exceeds several times their capacity to retain Cd, the sorption of Cd was clearly enhanced with increasing P rates. In these soils, two distinct effects of P addition on Cd retention were observed. The first one arose from variations in the soil-suspension pH and the concomitant changes in soil surface charge. The second effect was directly related to the amount of sorbed P. Most of the Cd sorbed in the four soils was strongly bonded. In the Andisols, increasing P sorption on the surfaces restricted Cd desorption.
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Taylor & Francis
2004
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Subjects: | Andisols, Alfisols, Heavy metals, Surface charge, |
Online Access: | http://hdl.handle.net/10261/244506 |
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dig-ica-es-10261-2445062021-06-24T02:19:37Z Cadmium sorption-desorption by soils in the absence and presence of phosphate Pardo Fernández, María Teresa Andisols Alfisols Heavy metals Surface charge Batch experiments were carried out to determine the effect of phosphate anion (P) on the sorption-desorption of cadmium (Cd). The soils selected for the study were two kaolinitic Alfisols and two Andisols, which differ in their variable charge components. At the natural soil pH, Cd sorption in the absence of P was related to the net negative surface charge of the soils. Sorption of P increased the negative charge of the soils but the increase per unit amount of P added decreased with increasing P sorption. Both pH and soil characteristics influence the effect of P on Cd reactions. In the Alfisols, P and Cd were sorbed in similar amounts and the effect of increasing P rates on Cd sorption-desorption reactions was negligible. In the allophanic Andisols, whose capacity to bind P exceeds several times their capacity to retain Cd, the sorption of Cd was clearly enhanced with increasing P rates. In these soils, two distinct effects of P addition on Cd retention were observed. The first one arose from variations in the soil-suspension pH and the concomitant changes in soil surface charge. The second effect was directly related to the amount of sorbed P. Most of the Cd sorbed in the four soils was strongly bonded. In the Andisols, increasing P sorption on the surfaces restricted Cd desorption. 2021-06-23T12:00:06Z 2021-06-23T12:00:06Z 2004 2021-06-23T12:00:07Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1081/CSS-120038554 issn: 0010-3624 e-issn: 1532-2416 Communications in Soil Science and Plant Analysis 35(11-12): 1553-1568 (2004) http://hdl.handle.net/10261/244506 10.1081/CSS-120038554 http://dx.doi.org/10.1081/CSS-120038554 Sí none Taylor & Francis |
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Andisols Alfisols Heavy metals Surface charge Andisols Alfisols Heavy metals Surface charge Pardo Fernández, María Teresa Cadmium sorption-desorption by soils in the absence and presence of phosphate |
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Batch experiments were carried out to determine the effect of phosphate anion (P) on the sorption-desorption of cadmium (Cd). The soils selected for the study were two kaolinitic Alfisols and two Andisols, which differ in their variable charge components. At the natural soil pH, Cd sorption in the absence of P was related to the net negative surface charge of the soils. Sorption of P increased the negative charge of the soils but the increase per unit amount of P added decreased with increasing P sorption. Both pH and soil characteristics influence the effect of P on Cd reactions. In the Alfisols, P and Cd were sorbed in similar amounts and the effect of increasing P rates on Cd sorption-desorption reactions was negligible. In the allophanic Andisols, whose capacity to bind P exceeds several times their capacity to retain Cd, the sorption of Cd was clearly enhanced with increasing P rates. In these soils, two distinct effects of P addition on Cd retention were observed. The first one arose from variations in the soil-suspension pH and the concomitant changes in soil surface charge. The second effect was directly related to the amount of sorbed P. Most of the Cd sorbed in the four soils was strongly bonded. In the Andisols, increasing P sorption on the surfaces restricted Cd desorption. |
format |
artículo |
topic_facet |
Andisols Alfisols Heavy metals Surface charge |
author |
Pardo Fernández, María Teresa |
author_facet |
Pardo Fernández, María Teresa |
author_sort |
Pardo Fernández, María Teresa |
title |
Cadmium sorption-desorption by soils in the absence and presence of phosphate |
title_short |
Cadmium sorption-desorption by soils in the absence and presence of phosphate |
title_full |
Cadmium sorption-desorption by soils in the absence and presence of phosphate |
title_fullStr |
Cadmium sorption-desorption by soils in the absence and presence of phosphate |
title_full_unstemmed |
Cadmium sorption-desorption by soils in the absence and presence of phosphate |
title_sort |
cadmium sorption-desorption by soils in the absence and presence of phosphate |
publisher |
Taylor & Francis |
publishDate |
2004 |
url |
http://hdl.handle.net/10261/244506 |
work_keys_str_mv |
AT pardofernandezmariateresa cadmiumsorptiondesorptionbysoilsintheabsenceandpresenceofphosphate |
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1777663765362245632 |