title: Accumulation kinetics and equilibrium partitioning coefficients for semivolatile organic pollutants in forest litter.
abstract: Soils are important stores of environmentally cycling semivolatile organic contaminants (SVOCs) and represent relevant atmospheric secondary sources whenever environmental conditions favor re-emission. The exchange between air and soil is controlled by resistances posed by interfacial matrices such as the ubiquitously distributed vegetation litter. For the first time, this study focused on the experimental characterization of accumulation parameters for SVOCs in litter under real field conditions. The logarithm of the litter-air equilibrium partitioning coefficient ranged 6.8-8.9 and had a similar dependence on logKOA as that of plant foliage and soil data. Uptake and release rates were also KOA dependent with values (relevant for real environmental conditions) ranging 30,000-150,000 d(-1) and 0.0004-0.0134 d(-1), respectively. The overall mass transfer coefficient v controlling litter-air exchange (0.03-1.4 cm s(-1)) was consistent with previously reported data of v for foliage in forest canopies after normalization on leaf area index. Obtained data suggest that litter holds the potential for influencing atmospheric fugacity in proximity to soil, likely affecting overall exchange of SVOCs between the soil reservoir and the atmosphere.
authors: Norwegian Institute for Water Research , Oslo, 0349, Norway.
authors: Luca
authors: L
authors: Nizzetto
authors: Xiang
authors: X
authors: Liu
authors: Gan
authors: G
authors: Zhang
authors: Klara
authors: K
authors: Komprdova
authors: Jiri
authors: J
authors: Komprda
mesh_terms: D000388:Air; D065928:Forests; D007700:Kinetics; D018515:Plant Leaves; D011078:Polychlorinated Biphenyls / Q000032:analysis* / Q000737:chemistry; D012987:Soil; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry; D055549:Volatile Organic Compounds / Q000032:analysis* / Q000737:chemistry
chemical_list: D012987:Soil; D012989:Soil Pollutants; D055549:Volatile Organic Compounds; D011078:Polychlorinated Biphenyls