Uptake and depuration of nonionic organic contaminants from sediment by the oligochaete, Lumbriculus variegatus

Environmental Toxicology and Chemistry
By: , and 

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Abstract

Uptake of sediment-associated contaminants by the oligochaete Lumbriculus variegatus was evaluated after 1, 3, 7, 14, 28, and 56 d of exposure to a field-collected sediment contaminated with DDT and its metabolites, dichlorodiphenyldichloroethane (DDD) and dichlorodiphenyldichloroethylene (DDE), or to a field-collected sediment contaminated with polycyclic aromatic hydrocarbons (PAHs). Depuration of contaminants by oligochaetes in a control sediment or in water was also evaluated over a 7-d period after 28 d of exposure to the field-collected sediments. Accumulation of PAHs with a log octanol-water partitioning coefficient (log Kow) 5.6 or DDD and DDE typically exhibited a steady increase from day 1 to about day 14 or 28, followed by a plateau. Therefore, exposures conducted for a minimum of 14 to 28 d better reflected steady-state concentrations for DDT and its metabolites and for PAHs. Depuration rates for DDT and its metabolites and high-Kow PAHs were much higher in organisms held in clean sediment relative to both water-only depuration and model predictions. This suggests that depuration in clean sediment may artificially accelerate depuration of hydrophobic compounds. Comparisons between laboratory-exposed L. variegatus and oligochaetes collected in the field from these sediments indicate that results of laboratory tests can be extrapolated to the field with a reasonable degree of certainty.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Uptake and depuration of nonionic organic contaminants from sediment by the oligochaete, Lumbriculus variegatus
Series title Environmental Toxicology and Chemistry
DOI 10.1002/etc.5620220427
Volume 22
Issue 4
Year Published 2003
Language English
Publisher Wiley
Contributing office(s) Columbia Environmental Research Center
Description 14 p.
First page 872
Last page 885