Aquatic risk assessment of chemicals: is it working?

Article Abstract:

The failure of sophisticated risk assessment techniques in abating the environmental risk of chemicals in aquatic ecosystems stems from the poor understanding of the limitations of such risk assessment techniques. Current models used to evaluate the risk of chemicals in aquatic environment are still deficient in modeling the interaction of chemicals with other contaminants, as well as the components of the aquatic ecosystem, both the biotic and abiotic components. One better solution to assess the risk of chemicals in aquatic systems is to select bioindicator species, since these species are more sensitive to changes in their environment, making risk assessment more timely and sensitive.

Water Pollution, Analysis, Risk assessment, Evaluation, Biological monitoring, Indicators (Biology), Biological indicators

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Deformities in Minnesota frogs linked to water in new study

Article Abstract:

Researchers at the Minnesota Pollution Control Agency and the National Institute of Environmental Health Sciences are attributing the deformations seen in Minnesota frogs to chemicals such as herbicides and insecticides found in most ponds in the state. A wide range of abnormalities were found in laboratory frogs grown in water from the Minnesota sites. They have ruled out parasites and UV-B radiation as probable causes and hinted that whatever is causing the abnormalities can travel into groundwater.

Water Pollution by Geographic Location, Abnormalities, Reports, Frogs, Minnesota, United States. National Institute of Environmental Health Sciences, Ponds, Minnesota. Pollution Control Agency

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Photoproducts and metabolites of a common insect growth regulator produce developmental deformities in Xenopus

Article Abstract:

Products of S-methoprene's reaction with sunlight, water, and microorganisms dramatically interfere with normal amphibian development. This emerges despite the findings that S-methoprene, the common insect growth regulator poses minimal developmental determent. The study looks into the effects of pesticide degradation in early amphibian development through directly exposing Xenopus laevis embryos to trace levels of synthetically prepared degradates.

Comment:

Products of S-methoprene's reaction with sunlight, water, and microorganisms dramatically interfere with normal amphibian dvlpmt

United States, Product information, Pesticide and Other Agricultural Chemical Manufacturing, Repellents & Attractants, Repellents, Article

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