Affiliations: College of Life Sciences, Nankai University, Tianjin
300071, China | College of Chemistry and Life Sciences, Tianjin Normal
University, Tianjin 300074, China
Abstract: 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 was increased 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 significant 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 inhibit 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.
Keywords: domestic rubbish compost, EDTA, turfgrass, heavy metal, accumulation
