Heavy metal accumulation of urban domestic rubbish compost in turfgrass by EDTA chelating
DUO Li-an , GAO Yu-bao , ZHAO Shu-lan
DOI:
Received December 06, 2004,Revised January 25, 2005, Accepted , Available online
Volume 17,2005,Pages 813-816
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Seven kinds of heavy metal accumulation of rubbish compost in turfgrass by EDTA chelating were investigated. With EDTA application, heavy metal accumulation by two species of turfgrass wasincreased significantly. The enrichment coefficients of Lolium Perenne L(L) and Festuca arundinacea L(F) to Cr reached 9.45 and 6.15 respectively. In the range of EDTA dosages given, heavy metal accumulation in turfgrass increased with increasing EDTA level. There were signaficant differences in remediation of different metals by applying EDTA. L had high ability to accumulate Cr, Cd, Ni and Zn, showing better remediation to heavy metals of rubbish compost. In contrast, F showed high ability to accumulate Cr, Ni, Cu and Zn. Low EDTA level increased aboveground net primary production(ANP) of turfgrass, but EDTA would considerably inhibite it when EDTA was higher than 20 mmol/kg. The results demonstrated that the optimum dosage of EDTA for remediating heavy metals in rubbish compost by turfgrass was between 10 mmol/kg and 20 mmol/kg.
