Heavy metal accumulation of urban domestic rubbish compost in turfgrass by EDTA chelating.
Heavy metal accumulation of urban domestic rubbish compost in turfgrass by EDTA chelating.
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发表时间：
2005
影响因子：
6.9
通讯作者：
L. Duo;Yu-bao Gao;Shuwei Zhao
中科院分区：
文献类型：
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作者：
L. Duo;Yu-bao Gao;Shuwei Zhao
采用EDTA螯合法研究了垃圾堆肥中7种重金属在草坪草中的富集规律。EDTA处理显著提高了两种草坪草对重金属的积累量。多年生黑麦草和高羊茅对Cr的富集系数分别达到9.45和6.15。在一定的EDTA用量范围内，草坪草对重金属的累积量随EDTA用量的增加而增加。EDTA对不同重金属的修复效果存在显著差异。L对Cr、Cd、Ni和Zn的富集能力较强，对垃圾堆肥中的重金属有较好的修复作用。而F对Cr、Ni、Cu和Zn的富集能力较强。低浓度的EDTA能促进草坪草地上部净初级生产力（ANP）的增加，但当EDTA浓度超过20 mmol/kg时，对ANP的增加有明显的抑制作用。结果表明，EDTA对草坪草修复垃圾堆肥中重金属的最佳用量为10 ~ 20 mmol/kg。
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.