Modeling and risk assessment of tributylin accumulation in the food web of a shallow freshwater lake

Article Abstract:

An integrated fate and bioaccumulation model is developed using tributylin (TBT) measurements in a food web in the freshwater Lake Westeinder. A load reduction scenario for TBT emission was likewise developed, factoring in the Dutch ban on antifouling paints with TBT. Probability distributions of TBT concentrations in the food web are compared to the measured variation in TBT concentrations by integrating Monte Carlo sampling with a calibration procedure. These distributions were then used in a dynamic risk analysis of TBT accumulation in water, sediment and the food web in the whole lake and a typical marina.

Tributyltin, Tributylin

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Trophic-level differences in the biocentration of chemicals: implications in assessing environmental biomagnification

Article Abstract:

A study was conducted to determine if higher lipophilic chemical accumulation in organisms with increasing trophic level can be attributed to mere bioconcentration in organisms with higher lipid content or to biomagnification. Results revealed that trophic-level bioconcentration variations are caused by organisms' lower chemical elimination efficiency and higher lipid content, which raises chemical storage capacity. These indicate that what often appears as environmental biomagnification may actually be species differences in bioconcentration.

Food and nutrition, Aquatic ecology, Xenobiotics, Marine fauna, Marine animals, Chemical ecology

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Bioaccumulation of hydrophobic chemicals in agricultural food chains

Article Abstract:

The fugacity of many compounds remained similar in air, soil and plants, indicating near-equilibrium partitioning. However, the fugacities of the more involatile, hydrophobic compounds declined by more than three orders of magnitude from air to plants to cow's milk. Called biodilution, this phenomenon is caused by the kinetically limited uptake of less volatile compounds in plants and the reduced absorption of very hydrophobic compounds in cows.

Food chains (Ecology), Food chains

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