Chemical screening study

European officials have turned to Duane Huggett, an assistant professor of biology at the University of North Texas, to develop a new, more-efficient screening process for potentially hazardous chemicals.

’Europe has gotten very serious about addressing and eliminating dangerous chemicals,’ Huggett said. ’But cost and time are major roadblocks. We want to see what can be done to address these problems.’

At issue is whether a chemical will move up a food chain. The pesticide DDT, used widely in the 1940s and 1950s, is a prime example of a chemical that magnified in the food chain, possibly poisoning wildlife and the environment and endangering human health. The pesticide was eventually banned in the US.

Scientists use fish and other aquatic organisms to research chemicals because many of the chemicals are released in waterways.

In the current chemical screening process, 200 to 400 fish are exposed to water containing a given chemical for 28 days and then moved to clean water for 14 days. Scientists then determine how long it takes for the fish to absorb the chemical and how long it takes to eliminate it from their bodies.