Agricultural Use of Sewage Treatment Plant Sludges, a Potential Source of Mercury Contamination

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Abstract
The mercury content of a selection of sewage sludges and fertilizers used for agricultural purposes is determined. Sludges from sewage treatment plants in Southern Ontario were chosen to represent a range of sewage imput compositional patterns. These range from rural town to heavy density urban types. Results are compared with unsludged soils (rural and urban) in the same local area.