title: A passive dosing method to determine fugacity capacities and partitioning properties of leaves.
abstract: The capacity of leaves to take up chemicals from the atmosphere and water influences how contaminants are transferred into food webs and soil. We provide a proof of concept of a passive dosing method to measure leaf/polydimethylsiloxane partition ratios (Kleaf/PDMS) for intact leaves, using polychlorinated biphenyls (PCBs) as model chemicals. Rhododendron leaves held in contact with PCB-loaded PDMS reached between 76 and 99% of equilibrium within 4 days for PCBs 3, 4, 28, 52, 101, 118, 138 and 180. Equilibrium Kleaf/PDMSextrapolated from the uptake kinetics measured over 4 days ranged from 0.075 (PCB 180) to 0.371 (PCB 3). The Kleaf/PDMSdata can readily be converted to fugacity capacities of leaves (Zleaf) and subsequently leaf/water or leaf/air partition ratios (Kleaf/waterand Kleaf/air) using partitioning data from the literature. Results of our measurements are within the variability observed for plant/air partition ratios (Kplant/air) found in the literature. Log Kleaf/airfrom this study ranged from 5.00 (PCB 3) to 8.30 (PCB 180) compared to log Kplant/airof 3.31 (PCB 3) to 8.88 (PCB 180) found in the literature. The method we describe could provide data to characterize the variability in sorptive capacities of leaves that would improve descriptions of uptake of chemicals by leaves in multimedia fate models.
authors.affiliation: Department of Environmental Science and Analytical Chemistry (ACES), Stockholm University, SE-114 18 Stockholm, Sweden. damien.bolinius@aces.su.se.
authors.forename: Damien Johann
authors.initials: DJ
authors.lastname: Bolinius
authors.affiliation: Department of Environmental Science and Analytical Chemistry (ACES), Stockholm University, SE-114 18 Stockholm, Sweden. damien.bolinius@aces.su.se.
authors.forename: Matthew
authors.initials: M
authors.lastname: MacLeod
authors.affiliation: Department of Environmental Science and Analytical Chemistry (ACES), Stockholm University, SE-114 18 Stockholm, Sweden. damien.bolinius@aces.su.se.
authors.forename: Michael S
authors.initials: MS
authors.lastname: McLachlan
authors.affiliation: Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet B 115, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Philipp
authors.initials: P
authors.lastname: Mayer
authors.affiliation: Department Cell Toxicology, Helmholtz Centre for Environmental Research (UFZ), Permoserstr. 15, DE-04318 Leipzig, Germany.
authors.forename: Annika
authors.initials: A
authors.lastname: Jahnke
mesh_terms: D000388:Air; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000737:chemistry*; D029793:Rhododendron; D014867:Water
chemical_list: D004129:Dimethylpolysiloxanes; D004785:Environmental Pollutants; D014867:Water; C013830:baysilon; D011078:Polychlorinated Biphenyls