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World Should Wake Up To Dangers Of Toxic Contaminants In Environment
People living in both urban and rural environments are increasingly exposed to toxic mixtures of heavy metals and organic chemicals such as pesticides, PCBs and VOCs in their food, water, air and soil yet most governments continued to address the problem one chemical at a time, says Professor Ravi Naidu, convenor of the global CleanUp 09 conference which opens in Adelaide today.
Prof. Naidu is the managing director of CRC CARE, a research and development organisation providing cutting edge technologies and knowledge in assessing, preventing and remediating contamination of soil, water and air.
In contaminated sites we are almost always dealing with mixtures. As we see from the cases of Ledger and Jackson, combinations can sometimes be far more deadly than individual substances.
It makes far better sense to assess the risk to human health posed by the combined contaminants, than to look at them one by one.
This meant assessing not only the mixture of chemicals, but which parts of it were capable of reaching the public via the food chain, water, air or dust, and the combined health effects this might have.
This issue, known as bioavailability, represents another huge challenge for the environmental clean-up sector worldwide, Prof. Naidu says.
Bioavailability means establishing whether or not the toxic substance can actually reach you. In some cases it can and in others, for various reasons, it cant. The sites we ought to clean up as a priority are the ones where the toxins are available to reach the public and environment.
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