Soil cation leaching by 'acid rain' with varying nitrate-to-sulfate ratios

Huete, AR; McColl, JG

Soil cation leaching by 'acid rain' with varying nitrate-to-sulfate ratios

Huete, AR

McColl, JG

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Publication Type:: Journal Article
Citation:: Journal of Environmental Quality, 1984, 13 (3), pp. 366 - 371
Issue Date:: 1984-01-01

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Field	Value	Language
dc.contributor.author	Huete, AR https://orcid.org/0000-0003-2809-2376	en_US
dc.contributor.author	McColl, JG	en_US
dc.date.issued	1984-01-01	en_US
dc.identifier.citation	Journal of Environmental Quality, 1984, 13 (3), pp. 366 - 371	en_US
dc.identifier.issn	0047-2425	en_US
dc.identifier.uri	http://hdl.handle.net/10453/13385
dc.description.abstract	The influence of the anion composition of simulated 'acid rain' on cation leaching of three soils with different surface-charge properties was examined. Four acid mixtures of H2SO4 and HNO3 all with pH 3.5, but with varying NO3-/SO42- mole ratios of 1.00:0.00, 0.75:0.25, 0.55:0.45, and 0.00:1.00, were used to leach an Ultic-Alfisol, an Oxisol, and an Entisol. The taxonomic names of these three soils are (1) Cornutt series: fine, mixed, mesic Ultic Haploxeralfs, (2) unnamed Rhodustox, and (3) Hanford series: coarse-loamy, mixed, nonacid, thermic Typic Xerorthents. The Alfisol had a high SO42- adsorption capacity because of its high Fe2O3 content of 12 g kg-1 and high point-of-zero charge (PZC) of 6.0. The Oxisol, although strongly weathered, had a lower Fe2O3 content of 5 g kg-1 and PZC of 4.5. The Entisol was relatively unweathered soil derived from silicaceous alluvium, with even less Fe2O3 of 3 g kg-1 and a lower PZC of 3.5, and represented a soil of fixed charge. Cation leaching of the Alfisol varied directly with the NO3- content of the leaching input due to the higher mobility of NO3- compared with SO42- that was adsorbed. The relative NO3-/SO42- contents of inputs had no effects on cation leaching of the Entisol. Effects on leaching of the Oxisol were intermediate between those of the Alfisol and Entisol. It was clearly demonstrated that the anion composition of 'acid rain' plays a significant role in the cation leaching of soils with amphoteric-charge properties, which are able to adsorb SO42-. Some practical implications are also dicussed.	en_US
dc.relation.ispartof	Journal of Environmental Quality	en_US
dc.relation.isbasedon	10.2134/jeq1984.00472425001300030009x	en_US
dc.subject.classification	Agronomy & Agriculture	en_US
dc.title	Soil cation leaching by 'acid rain' with varying nitrate-to-sulfate ratios	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	13	en_US
utslib.for	0602 Ecology	en_US
utslib.for	04 Earth Sciences	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CAMGIS - Centre for Advanced Modelling and Geospatial lnformation Systems
utslib.copyright.status	closed_access
pubs.issue	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	13	en_US

Abstract:

The influence of the anion composition of simulated 'acid rain' on cation leaching of three soils with different surface-charge properties was examined. Four acid mixtures of H2SO4 and HNO3 all with pH 3.5, but with varying NO3-/SO42- mole ratios of 1.00:0.00, 0.75:0.25, 0.55:0.45, and 0.00:1.00, were used to leach an Ultic-Alfisol, an Oxisol, and an Entisol. The taxonomic names of these three soils are (1) Cornutt series: fine, mixed, mesic Ultic Haploxeralfs, (2) unnamed Rhodustox, and (3) Hanford series: coarse-loamy, mixed, nonacid, thermic Typic Xerorthents. The Alfisol had a high SO42- adsorption capacity because of its high Fe2O3 content of 12 g kg-1 and high point-of-zero charge (PZC) of 6.0. The Oxisol, although strongly weathered, had a lower Fe2O3 content of 5 g kg-1 and PZC of 4.5. The Entisol was relatively unweathered soil derived from silicaceous alluvium, with even less Fe2O3 of 3 g kg-1 and a lower PZC of 3.5, and represented a soil of fixed charge. Cation leaching of the Alfisol varied directly with the NO3- content of the leaching input due to the higher mobility of NO3- compared with SO42- that was adsorbed. The relative NO3-/SO42- contents of inputs had no effects on cation leaching of the Entisol. Effects on leaching of the Oxisol were intermediate between those of the Alfisol and Entisol. It was clearly demonstrated that the anion composition of 'acid rain' plays a significant role in the cation leaching of soils with amphoteric-charge properties, which are able to adsorb SO42-. Some practical implications are also dicussed.

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