Phosphate alters the compositional characteristics of humic acid adsorbed onto goethite

	Phosphate alters the compositional characteristics of humic acid adsorbed onto goethite
	Luo, ChunYan; Wen, ShuaiLong; An, ShiLin; Lu, YueHan; Du, YingXun
刊名	JOURNAL OF SOILS AND SEDIMENTS
	2021
卷号	21 期号:10 页码:3352-3366
英文摘要	Purpose The adsorption of organic matter and phosphate on minerals is a common natural process that has an important impact on the migration and burial of carbon and phosphorus. Previous studies have focused mainly on the influence of organic matter on the adsorption of phosphate. Yet, the influence of phosphate on the adsorption of different pools of organic matter is not well understood. This study evaluates changes in different organic matter pools during their adsorption to minerals in the presence of phosphate. Materials and methods Firstly, the adsorption behaviors of natural organic matter (i.e., humic acid) and phosphate on goethite were evaluated separately. Secondly, humic acid and phosphate were added to goethite at different orders to elucidate the effect of phosphate on the fractionation of humic acid components adsorbed to goethite. Results and discussion The results showed that when phosphate and humic acid were added simultaneously, goethite was preferentially combined with phosphate. In the absence of phosphate, SUVA(254) of the humic acid solution decreased and E-2/E-3 of the solution increased during the adsorption. Among the six EEM-PARAFAC (excitation-emission matrix fluorescence coupled with parallel factor analysis) components of the humic acid, C1, C2, and C4 (terrestrial humus-like substances) decreased significantly and exhibited strong adsorption, C3 (microbial fulvic-like substance) showed weak adsorption, whereas C5 (photodegradation products) and C6 (tyrosine-like component) did not show evident adsorption. In the presence of phosphate, phosphate inhibited, and replaced the adsorbed C1, C2, and C4, but promoted the adsorption of C5, which increased the aromaticity and the molecular weight of the humic acid solution. Conclusions Our results reveal that phosphate influences the fractionation of humic acid components adsorbed onto goethite, suggesting that phosphate can alter the chemical composition of natural organic matter interacting with minerals and thus impact the burial and fractionation of natural organic matter at the mineral-water interface.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/20532]
专题	中国科学院南京地理与湖泊研究所
推荐引用方式 GB/T 7714	Luo, ChunYan,Wen, ShuaiLong,An, ShiLin,et al. Phosphate alters the compositional characteristics of humic acid adsorbed onto goethite[J]. JOURNAL OF SOILS AND SEDIMENTS,2021,21(10):3352-3366.
APA	Luo, ChunYan,Wen, ShuaiLong,An, ShiLin,Lu, YueHan,&Du, YingXun.(2021).Phosphate alters the compositional characteristics of humic acid adsorbed onto goethite.JOURNAL OF SOILS AND SEDIMENTS,21(10),3352-3366.
MLA	Luo, ChunYan,et al."Phosphate alters the compositional characteristics of humic acid adsorbed onto goethite".JOURNAL OF SOILS AND SEDIMENTS 21.10(2021):3352-3366.