Abstract
The uptake and speciation of Hg and Se were assessed for the edible portion of 16 different vegetable crops grown on a garden plot which had been exclusively treated with residential compost for 6 yr. This study was conducted under actual field conditions typical of residential gardening and utilized organic gardening techniques. Crops had methylmercury levels averaging 12.8 % of the total edible tissue Hg content, divalent inorganic Hg being the only other element form identified. An average of 20.0% of the total Se content was present as hexavalent Se, the remainder being divalent and tetravalent Se forms. In terms of plant/soil concentration factors, Se was more readily assimilated by crops than Hg.
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