title: Competitive sorption of pyrene on wood chars.
abstract: Sorption isotherms of pyrene on original and heat-treated wood chars were examined to understand its sorption behavior. Pyrene in single-solute systems had nonlinear isotherms. Polanyi-based dual-domain model fit sorption data well, and the model results showed that the adsorption component dominated pyrene sorption by original char at all aqueous concentrations. In contrast, this adsorption component contributed a much lower fraction to the total sorption by the heat-treated char, and dominated only at low solute concentrations; with increasing concentration, partitioning became a predominant contributor to the total sorption. Competitive effect of four cosolutes, phenanthrene (Phen), benzo[a]anthracene (BaA), 2,2-methylene-bis (4-methyl-6-tert-butylphenol) (MMBP), and phenol on pyrene sorption by original and treated chars was examined to understand the underlying mechanism of competition. Hydrophobicity (adsorbability) and molecular size of competitors played an important role in competition with pyrene by both chars, suggesting the direct competition for sorption sites and pore blockage mechanism. Competitive sorption results indicated that the fate and transport of hydrophobic organic chemicals (e.g., pyrene) could be strongly affected in the presence of coexisting organic contaminants with high hydrophobicity and large molecularsize,thereby, enhancing the mobility and leachability of these chemicals.
authors.affiliation: Department of Plant, Soil and Insect Sciences, Stockbridge Hall, University of Massachusetts, Amherst, Massachusetts 01003, USA. xilong@psis.umass.edu
authors.forename: Xilong
authors.initials: X
authors.lastname: Wang
authors.forename: T
authors.initials: T
authors.lastname: Sato
authors.forename: Baoshan
authors.initials: B
authors.lastname: Xing
mesh_terms: D000327:Adsorption; D000818:Animals; D001551:Benz(a)Anthracenes / Q000737:chemistry; D004784:Environmental Monitoring; D057927:Hydrophobic and Hydrophilic Interactions; D010616:Phenanthrenes / Q000737:chemistry; D010636:Phenols / Q000737:chemistry; D011721:Pyrenes / Q000032:analysis* / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis*; D012995:Solubility; D013057:Spectrum Analysis; D014337:Trout; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014934:Wood
chemical_list: D001551:Benz(a)Anthracenes; D010616:Phenanthrenes; D010636:Phenols; D011721:Pyrenes; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; C031181:phenanthrene; C030984:pyrene