Prediction of concentrations of 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents from total concentrations of polychlorinated biphenyls in fish fillets

Article Abstract:

Consumption advisories for Great Lakes fish are based on total concentration of polychlorinated biphenyls (PCBs), which do not accurately reflect toxicity since PCBs are complex matrices of congeners. Single congeners vary in toxic potency and the relative concentration of congeners vary among environmental samples. Concentrations of dioxin-equivalent in Lake Michigan chinook salmon proved predictable from total concentrations of PCBs with low uncertainty. A toxicity risk assessment based on dioxin-equivalents calculated a yearly allowable consumption of 90 grams compared to 32 grams calculated from total PCBs.

Research, Fishes, Contamination, Dioxin, Dioxins

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Estimation of uptake rate constants for PCB congeners accumulated by semipermeable membrane devices and brown trout (Salmo trutta)

Article Abstract:

A calibration study was done to compare the uptake of PCB congeners by the triolein-filled semipermeable membrane device (SPMD). The uptake of the SPMD was compared to the accumulation of PCB congeners in the body of the brown trout. Uptake of PCB in the trout increased from 0.06 microgram/gram (ug/g) to 118.3 ug/g, while in the SPMD the concentration rose from 0.03 ug/g to 203.4 ug/g. Computations showed that the uptake rate constants were similar for both the trout and the SPMD, especially under conditions of similar total organic carbon concentration in the water.

All Other Miscellaneous General Purpose Machinery Manufacturing, Ion Exchange Membranes, General industrial machinery, not elsewhere classified, Testing, Environmental aspects, Biodegradation, Membranes (Technology), Biological assay, Bioassay

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QSAR evaluation of alpha-terthienyl phototoxicity

Article Abstract:

A study was conducted to examine the effect of phototoxic chemicals such as alpha-terthienyl on bioaccumulation and light absorption capacity in the sea urchins. The results showed that phototoxicty increases as the gap between the highest and lowest molecular orbitals increases. They also showed that organisms which exhibited greater light absorption showed greater phototoxicity.

Methods, Analysis, Photochemistry, Toxicity testing, Toxicity tests

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