title: Effects of salinity and humic acid on the sorption of Hg on Fe and Mn hydroxides.
abstract: The objective of this study was to investigate the influence of humic acid (HA) and salinity on adsorption of Hg on the amorphous and crystalline of iron and manganese hydroxides. The results show that the adsorption of Hg(2+) on Fe and Mn hydroxides was inhibited in marine system due to the formation of stable, nonsorbing aqueous HgCl(2) complexes in solution. Moreover, Cl(-) inhibited the Hg(2+) adsorption more severely on amorphous than crystalline hydroxides. The addition of HA inhibited Hg(2+) adsorption on Fe and Mn hydroxides in freshwater system might be attributed to the competition between Hg(2+) and HA on adsorption to Fe and Mn hydroxides. In contrast, the addition of HA promoted Hg(2+) adsorption on Fe and Mn hydroxides in the marine system, which might be due to the addition of humic acid resulted in the reaction between Cl(-) and HA, and therefore the reducing of Cl(-) promoted more Hg(2+) on Fe and Mn hydroxides. In addition, the influence of HA on Hg(2+) adsorption on Fe and Mn hydroxides are more visible for crystalline than amorphous hydroxides.
authors.affiliation: School of Environmental and Resource Sciences, Zhejiang Agriculture and Forestry University, Lin'an, Zhejiang Province, PR China.
authors.forename: Peng
authors.initials: P
authors.lastname: Liang
authors.forename: Yi-Chun
authors.initials: YC
authors.lastname: Li
authors.forename: Chan
authors.initials: C
authors.lastname: Zhang
authors.forename: Sheng-Chun
authors.initials: SC
authors.lastname: Wu
authors.forename: Hao-Jie
authors.initials: HJ
authors.lastname: Cui
authors.forename: Shen
authors.initials: S
authors.lastname: Yu
authors.forename: Ming H
authors.initials: MH
authors.lastname: Wong
mesh_terms: D000327:Adsorption; D005618:Fresh Water / Q000737:chemistry; D006812:Humic Substances; D006878:Hydroxides / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D008628:Mercury / Q000737:chemistry*; D054712:Salinity; D012623:Seawater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D006812:Humic Substances; D006878:Hydroxides; D014874:Water Pollutants, Chemical; D008345:Manganese; D007501:Iron; D008628:Mercury