title: Effect of cosolutes on the sorption of phenanthrene onto mineral surface of river sediments and kaolinite.
abstract: Sorption of phenanthrene onto the natural sediment with low organic carbon content (OC%), organic-free sediment, and kaolinite was investigated through isotherm experiments. Effects of cosolutes (pyrene, 4-n-nonyphenol (NP), and humic acid (HA)) on phenanthrene sorption were also studied by comparing apparent solid-water distribution coefficients (K d (app)) of phenanthrene. Two addition sequences, including "cosolute added prior to phenanthrene" and "cosolute and phenanthrene added simultaneously," were adopted. The Freundlich model fits phenanthrene sorption on all 3 sorbents well. The sorption coefficients on these sorbents were similar, suggesting that mineral surface plays an important role in the sorption of hydrophobic organic contaminants on low OC% sediments. Cosolutes could affect phenanthrene sorption on the sorbents, which depended on their properties, concentrations, and addition sequences. Pyrene inhibited phenanthrene sorption. Sorbed NP inhibited phenanthrene sorption at low levels and promoted sorption at high levels. Similar to NP, effect of HA on phenanthrene sorption onto the natural sediment depended on its concentrations, whereas, for the organic-free sediment and kaolinite, preloading of HA at high levels led to an enhancement in phenanthrene K d (app) while no obvious effect was observed at low HA levels; dissolved HA could inhibit phenanthrene sorption on the two sorbents.
authors.affiliation: Tianjin Centers for Disease Control and Prevention, Tianjin 300171, China.
authors.forename: Yinghong
authors.identifier: 0000-0002-9632-6456
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071, China.
authors.forename: Fang
authors.identifier: 0000-0001-6980-3627
authors.initials: F
authors.lastname: Liu
authors.affiliation: Key Laboratory for Applied Microbiology of Shandong Province, Biology Institute of Shandong Academy of Sciences, Jinan 250014, China.
authors.forename: Wen
authors.identifier: 0000-0003-0859-6905
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071, China.
authors.forename: Lei
authors.identifier: 0000-0002-8193-9954
authors.initials: L
authors.lastname: Wang
mesh_terms: D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D007616:Kaolin / Q000737:chemistry*; D008903:Minerals / Q000737:chemistry; D010616:Phenanthrenes / Q000737:chemistry*; D045483:Rivers
chemical_list: D008903:Minerals; D010616:Phenanthrenes; D007616:Kaolin; C031181:phenanthrene