title: Effects of fulvic substances on the distribution and migration of Hg in landfill leachate.
abstract: Mercury (Hg) distribution and migration in different landfill stabilization processes were evaluated in this study. Wide ranges of Hg concentrations were observed because of the heterogeneity and variability of landfill refuse. In addition, temporally variable conditions, including pH, organic matter, and vegetation cover, which influence Hg migration in landfills, may also affect the temporal distribution of Hg in landfill refuse. The main fraction of Hg, elemental Hg, decreased with time, while the stable fractions of Hg increased. The fulvic acid (FA) extracted from the landfill leachate had much lower overall Hg-complexation stability constants, which suggests that organic S groups might have been rapidly saturated by small amounts of Hg while leaving oxygen functional groups, such as carboxylic functional or phenolic groups, acting as the primary binding sites for Hg.
authors.affiliation: The State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China. xlchai@tongji.edu.cn
authors.forename: Chai
authors.initials: C
authors.lastname: Xiaoli
authors.forename: Liu
authors.initials: L
authors.lastname: Guixiang
authors.forename: Wu
authors.initials: W
authors.lastname: Jun
authors.forename: Tong
authors.initials: T
authors.lastname: Huanhuan
authors.forename: Ji
authors.initials: J
authors.lastname: Rong
authors.forename: Zhao
authors.initials: Z
authors.lastname: Youcai
mesh_terms: D001578:Benzopyrans / Q000032:analysis* / Q000737:chemistry; D005591:Chemical Fractionation; D004784:Environmental Monitoring; D006812:Humic Substances / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008628:Mercury / Q000032:analysis* / Q000737:chemistry; D012037:Refuse Disposal; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D001578:Benzopyrans; D006812:Humic Substances; D014874:Water Pollutants, Chemical; D008628:Mercury; C005023:fulvic acid