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	Formation of organo-mineral complexes as affected by particle size, pH, and dry-wet cycles
	Pan, B. ; Tao, S. ; Dawson, R. W. ; Xing, B. S.
	2010
关键词	adsorption dissolved organic matter fractionation functional groups pedogenesis CLAY-MINERALS FULVIC-ACID HUMIC-ACID MATTER ADSORPTION SORPTION GOETHITE SURFACES
DOI	10.1071/SR10029
英文摘要	The formation of organo-mineral complexes is an important process controlling carbon cycling and the properties of soil particles. However, differences between the complexes formed in aqueous systems and those found in terrestrial systems have not been clearly recognised. This study simulated the formation of organo-mineral complexes between dissolved humic acid (DHA) and mineral particles using a solid/aqueous adsorption experiment (aqueous system) and a wet-dry cycling methodology (terrestrial system). The clay fraction of mineral particles contributed greatly (>90%) to overall DHA adsorption on soil particles in adsorption experiments where DHA fractionation was clearly observed. Aromatic content was found to be less favourable for adsorption under all conditions. For particles of different sizes, the significance of fractionation increased with adsorption. High adsorption was observed under acid conditions, although there was less fractionation as a result of the acid-facilitated ligand exchange process. When using a wet-dry cycling methodology, a much higher f(OC) was observed for the complexes than when using the adsorption experiment, and DHA fractionation was not significant. Further, the distinctly decreased E(465)/E(665) ratio suggests that the DHA washed off from acid complexes was different from the original DHA and most likely the result of DHA precipitation during wet-dry cycles under acid conditions.; Soil Science; SCI(E); EI; 0; ARTICLE; 8; 713-719; 48
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/322366]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Pan, B.,Tao, S.,Dawson, R. W.,et al. Formation of organo-mineral complexes as affected by particle size, pH, and dry-wet cycles[J],2010.
APA	Pan, B.,Tao, S.,Dawson, R. W.,&Xing, B. S..(2010).Formation of organo-mineral complexes as affected by particle size, pH, and dry-wet cycles..
MLA	Pan, B.,et al."Formation of organo-mineral complexes as affected by particle size, pH, and dry-wet cycles".(2010).

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