Biomimetic extraction as a tool to identify chemicals with high bioconcentration potential

Article Abstract:

Two fragrances (HHCB and AHTN) contaminate waterways in the Netherlands. The fragrances, which are hydrophobic, are used in cosmetics, and household chemicals, and pass into the water system with household effluent. Using biomimetic extraction approaches, researchers tracked only low-levels of contamination in the water and fish from rivers into which treated wastewater was discharged. Ground water contamination existed at higher levels. Exhaustive extracts of the same samples detected none of these contaminants. Within fish, biotransformation may reduce the bioconcentration factors.

Science & research, Toilet Preparation Manufacturing, Toilet preparations, All Other Miscellaneous Chemical Product and Preparation Manufacturing, Toiletries & Cosmetics NEC, Polishes and sanitation goods, Household Chemicals NEC, Toiletries, Cosmetics industry, Soap and cleaning agents industry, Cleaning agents industry, Sewage, Water, Underground, Groundwater, Cosmetics, Statistical mechanics, Household chemicals

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Influence of biotransformation on the relationship between bioconcentration factors and octanol-water partition coefficients

Article Abstract:

The bioconcentration factor (BCF), the ratio of the concentration of a chemical in an aquatic organism to its concentration in the aqueous phase, is used in the risk assessment of contaminants in natural waters. The BCF of some chemicals in fish had previously correlated highly with the octanol-water coefficient. In this study the BCF of chlorinated anilines in guppies were lower than this relation would predict. The contribution of biotransformation to the total elimination rate of the chemicals in the fish is examined.

Fishes, Contamination

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An LC(subscript50) vs time model for the aquatic toxicity of reactive and receptor-mediated compounds

Article Abstract:

Current mathematical models for predicting lethal levels of toxic aquatic organic chemicals are not completely reliable. Researchers in this article examine various equations to support this conclusion. Additionally, the researchers examine equations that predict levels of bioreversibility for certain toxins. Based upon these examinations, the researchers present their own alternative model applicable to reactive and receptor-mediated toxicants to show that no constant critical body residue levels for these toxins exit.

United States, Product standards, safety, & recalls, Chemicals & Allied Products, Chemical Manufacturing, Belgium, CHEMICALS AND ALLIED PRODUCTS, Standards, Chemicals, Pollution control industry, Mathematical models, Chemical industry

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