Using solid-phase microextraction to determine partition coefficients to humic acids and bioavailable concentrations of hydrophobic chemicals

Article Abstract:

A study evaluates the feasibility of negligible depletion solid-phase microextraction (nd-SPME) to determine free fractions of chemicals in aquatic environments. In testing the potential interferences of the dissolved matrix, specifically humic acids, with the SPME measurements, it was discovered that nd-SPME was used to determine partition coefficients between dissolved organic carbon and water for four hydrophobic chemicals. In addition, the bioaccumulation of hexachlorobenzene and PCB 77 to Daphnia magna was determined in the presence and absence of humic acids. Thus, it was generalized that negligible depletion SPME is a suitable procedure to determine bioavailable concentations of hydrophobic chemicals in aquatic environments.

Comment:

Negligible depletion SPME is test-used to determine bioavailable concentations of hydrophobic chemicals in aquatic environments

United States, Article

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Organochlorines in Lake Superior's food web

Article Abstract:

Lake superior's food web was evaluated in 1994 with regards to the presence of hydrophobic organochlorine contaminants (OCs), among them toxaphene and chlordane and metabolites. Because of its concentrations that were two to 15 times higher than total PCBs, toxaphene was the major OC in the food web. There was no significant relationship between the accumulation of OCs in the food web and the log octanol/water partition effect. Because of this, deep water organisms in Lake Superior view settling particles as important sources of OCs.

Water Pollution by Geographic Location, Chlorine, Analysis, Environmental aspects, Water pollution, Food chains (Ecology), Food chains, Lake Superior, Organochlorine compounds, Organic chlorine compounds

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Removal of mercury from chemical wastewater by microorganisms in technical scale

Article Abstract:

This study undertakes the inoculation and operation of a pilot plant set up to remove the mercury from the wastewater produced at a chloralkali plant. The technology employed involved introducing pure cultures of seven mercury resistant strains of Pseudomonas inside a bed bioeactor.

Germany, Chlor-Alkalies, Statistical Data Included, Research, Economic aspects, Pollution control industry, Illustration, Alkali industry, Chlor-alkali industry, Green technology

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