Heavy metal accumulation of urban domestic rubbish compost in turfgrass by DTA chelating

• 作 者: DUO Lian GAO Yu-bao ZHAO Shu-lan
• 机 构: College of Life Sciences, Nankai University, Tianjin 300071, China;College of Chemistry and Life Sci
• 出 处: 环境科学学报（英文版）
• 发表日期: 2005年5期
• 关键词: domestic rubbish compost EDTA turfgrass heavy metal accumulation

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.