title: Solid phase microextraction of organic pollutants from natural and artificial soils and comparison with bioaccumulation in earthworms.
abstract: The presented study investigates the use of passive sampling, i.e. solid phase microextraction with polydimethylsiloxane fibers (PDMS-SPME), to assess the bioavailability of fiver neutral organic chemicals (phenanthrene, pyrene, lindane, p,p'-DDT, and PCB 153) spiked to natural and artificial soils after different aging times. Contaminant bioavailability was assessed by comparing PDMS concentrations with results from a 10 day bioaccumulation test with earthworms (Eisenia fetida). The hypotheses tested were (i) organic carbon (OC) normalization, which is commonly used to account for sorption and bioavailability of hydrophobic organic chemicals in soil risk assessment, has limitations due to differences in sorptive properties of OC and aging processes (i.e. sequestration and biodegradation) and (ii) PDMS-SPME provides a more reliable measure of soil contaminant bioavailability than OC normalized soil concentrations. The above stated hypotheses were confirmed since the results showed that: (i) the PDMS/soil organic carbon partition ratio (R) accounting for the role that OC plays in partitioning significantly differed between soils and aging times and (ii) the correlation with earthworm concentrations was better using porewater concentrations derived from PDMS concentrations than when organic normalized soil concentrations were used. Capsule: Sorption of organic compounds measured by SPME method and their bioavailability to earthworms cannot be reliably predicted using OC content.
authors.affiliation: Research Centre for Toxic Compounds in the Environment (RECETOX), Faculty of Science, Masaryk University, Kamenice 126/3, Brno CZ-62500, Czech Republic.
authors.forename: Lucie
authors.initials: L
authors.lastname: Bielská
authors.affiliation: Research Centre for Toxic Compounds in the Environment (RECETOX), Faculty of Science, Masaryk University, Kamenice 126/3, Brno CZ-62500, Czech Republic.
authors.forename: Klára
authors.initials: K
authors.lastname: Šmídová
authors.affiliation: Research Centre for Toxic Compounds in the Environment (RECETOX), Faculty of Science, Masaryk University, Kamenice 126/3, Brno CZ-62500, Czech Republic. Electronic address: hofman@recetox.muni.cz.
authors.forename: Jakub
authors.initials: J
authors.lastname: Hofman
mesh_terms: D000818:Animals; D004784:Environmental Monitoring; D009835:Oligochaeta / Q000737:chemistry* / Q000378:metabolism*; D009930:Organic Chemicals / Q000032:analysis / Q000378:metabolism; D012989:Soil Pollutants / Q000737:chemistry* / Q000378:metabolism*; D052617:Solid Phase Microextraction
chemical_list: D009930:Organic Chemicals; D012989:Soil Pollutants
keywords: Aging; Artificial soil; Bioaccumulation; Solid phase micro-extraction (SPME); Total organic carbon content (TOC)