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Dioxin risk in soil and plant tissues after long-term biosolids application
Date:7/14/2008

corn grains. Only trace levels were found in the corn stover, and there was no statistical difference between the control and the biosolids-amended plots. These observations suggest that dioxins from land application of biosolids do not pose any risk to human health or the environment, if biosolids are land applied according to the USEPA regulations.

The District has on-going research to investigate the trend of dioxins levels in biosolids over time. The USEPA's 2001 Dioxins Update to the National Sewage Sludge Survey indicated that dioxins levels in biosolids have declined since the last USEPA survey in 1988. This downward trend is expected to continue due to the regulatory controls on additional sources of dioxins in the environment, particularly on some combustion practices. These findings support the USEPA's decision not to regulate dioxins in land applied biosolids.


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Contact: Sara Uttech
suttech@agronomy.org
608-268-4948
American Society of Agronomy
Source:Eurekalert

Page: 1 2

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