title: Joint enhancement of lead accumulation in Brassica plants by EDTA and ammonium sulfate in sand culture.
abstract: When EDTA was added alone in the Pb-contaminated sand, the plant biomass and the total Pb amount in Plant decreased in both species, Brassica pekinensis and B. juncea var. multiceps, though the shoot Pb amount increased. In contrast, when (NH4)2SO4 was added alone in the Pb-contaminated sand, little effect was observed on the shoot Pb amount, though the root Pb amount was significantly increased in B. juncea var. multiceps. When amending EDTA and (NH4)2SO4 in combination, however, the shoot Pb amount in both species substantially increased, being, on an average, 2 times and 9 times higher than that in EDTA alone or (NH4)2SO4 alone amended treatment, respectively. The two amendments showed antagonism for plant growth, but synergism for Pb bioaccumulation. B. pekinensis showed its highest level of shoot and total Pb amount in the treatment amended with EDTA and (NH4)2SO4 only a half as much as in the other treatments. It is inferred that the mechanisms responsible for the joint-enhanced Pb accumulation might be concerned with the acidification of the growth medium, cation exchange reaction and relieving EDTA induced toxicity as results by amending ammonium sulfate.
authors.affiliation: Department of Environmental Sciences, Wuhan University, Wuhan 430072, China. ztxiong@chem.whu.edu.cn
authors.forename: Zhi-ting
authors.initials: ZT
authors.lastname: Xiong
authors.forename: Ping
authors.initials: P
authors.lastname: Lu
mesh_terms: D000645:Ammonium Sulfate / Q000737:chemistry*; D001937:Brassica / Q000737:chemistry* / Q000502:physiology; D002614:Chelating Agents / Q000737:chemistry*; D004347:Drug Interactions; D004492:Edetic Acid / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000493:pharmacokinetics*; D012822:Silicon Dioxide; D012989:Soil Pollutants / Q000493:pharmacokinetics*; D014018:Tissue Distribution
chemical_list: D002614:Chelating Agents; D012989:Soil Pollutants; D007854:Lead; D012822:Silicon Dioxide; D004492:Edetic Acid; D000645:Ammonium Sulfate