Citrate-Mediated increase in the uptake of weathered 2,2'-bis(p-chlorophenyl)1,1-dichloroethylene residues by plants

摘要

Experiments were conducted to determine the ability of citrate to enhance the plant uptake of weathered 2,2-bis(p- chlorophenyl(1,1-dichloroethylene(p,p'-DDE) from soil. Plots containing three rows of clover, mustard, hairy vetch, or rye grass were constructed in soils containing p,p'-DDE. On 11 occasions, the rows of each crop received water or sodium citrate(0.005 or 0.05 M). For each crop, there wee significant reductions in p,p'-DDE concentration in the soil fractions(near root and rhizosphere) closely associated with the plant versus bulk soil. The roots of each crop accumulated 2 to 5 times more of the weathered contaminant (dray wt) than present in the bulk soil.