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[Assessing bioaccumulation and bioavailability of PAHs and OCPs in water using sediment, rare minnow and biomimetic sampler].

Accumulation of polycyclic aromatic hydrocarbons (PAHs) and organochlorine pesticides (OCPs) in different phases in water was assessed in a wetland in Guanting, Beijing, China, by analyzing their concentrations in sediment, 30 d-exposed caged Chinese rare minnow (Gobiocypris rarus) and triolein embedded cellulose acetate membrane (TECAM). The applicability of TECAM to bioavailability assessment of PAHs and OCPs for aquatic organisms was also examined. The results showed that there were great differences of both bio-sediment accumulation factors (BSAFs) and TECAM-sediment accumulation factors (TSAFs) for target analytes between experiment sites with variation coefficients of 10%-70% and 20%-50%, respectively. The BSAFs and TSAFs were independent of relevant Kow. For the target pollutants especially PAHs, BSAFs for rare minnow were lower about one order of magnitude than those (1-4) predicted by equilibrium partitioning theory (EPT). However, TSAFs of PAHs and OCPs for TECAM were almost consistent with the EPT. Meanwhile, good correlations were found between the BSAFs and TSAFs for OCPs at 5 experiment sites (r = 0.80, 0.87, 0.83, 0.85 and 0.84, p < 0.01), but not good for PAHs (p > 0.1). It can be concluded that it is more reliable and accurate to assess the pollution status jointly using sediment, fish and TECAM, and that TECAM can be used as a biomimetic sampler to predict bioaccumulation potential of poorly biodegradable organic compounds like OCPs in fish.