学术论文

      沼液-土壤-蔬菜系统中重金属变化特征

      Characteristics of heavy metal in biogas slurry,soil and vegetable system

      摘要:
      以沼液-土壤-蔬菜系统中重金属为对象,研究系统中重金属含量、相关性及其富集能力,确定重金属的变化规律.结果表明:土壤和蔬菜中重金属Ni、Zn、Cd和Pb含量超过国内标准限值,土壤中有机质含量与Cu、As、Mn、Co、Ni、Pb和Zn含量成正相关,土壤pH与Cu、As、Cr和Cd含量成正相关,蔬菜中Co-Cu、Ni-Co、Ni-Cu和Zn-As间显示了显著相关性,表明蔬菜对重金属吸收表现出了协同作用,重金属富集系数从大到小排序为Cd、Zn、Cr、Pb、Mn、Cu、Ni、Co和As.蔬菜的富集系数从大到小排序为苋菜、空心菜、马兰头、大蒜、葱和田菜,叶菜的富集系数较大,表明叶菜利于土壤中重金属迁移,研究结果可以为沼液灌溉农田的重金属防控提供科学依据.
      Abstract:
      The contents of heavy metals,their correlations and accumulation factors were studied to make clear and definite the variation laws of heavy metals in biogas slurry,soil and vegetable system.Results showed that the concentrations of Ni,Zn,Cd and Pb in vegetables and related soils exceeded the upper limits of evaluation standards.Moreover,the concentrations of Mn,Co,Ni,Cu,Zn,As and Pb in soils showed significant correlations with organic matter (OM),and pH showed positive correlations with Cd,Cu,As and Cr.The strongest relationship was presented between Cu and Co,Cu and Ni,Ni and Co,and Zn and As in vegetables.The metal accumulation factors were found the highest for Cd followed by Zn,Cr,Pb,Mn,Cu,Ni,Co and As,and the average accumulation factors of vegetables were in the order of amaranth,water spinach,kalimeris indica,garlic,scallion and greens.Amaranth was observed to have a greater heavy metals absorption capacity compared with other vegetables.Results showed that the leafy vegetables had a higher uptake of heavy metals than non-leafy vegetables,which should be attenuated to mitigate the heavy metal contamination during production of biogas slurry.
      作者: 周灵君 [1] 吕琳 [2]
      Author: ZHOU Lingjun [1] LYU Lin [2]
      作者单位: 江苏省环境科学研究院,江苏南京 210036;江苏省环境工程重点实验室,江苏南京210036 江苏省环境科学研究院,江苏南京 210036;河海大学 环境学院,江苏南京210098
      年,卷(期): 2017, 39(3)
      分类号: X713
      在线出版日期: 2017年7月3日
      基金项目: 江苏省"333工程"资助项目,江苏省自然科学基金