文档介绍：文章编号:1008-181X (2000) 04-0270-04
重庆市蔬菜基地土壤中重金属含量及污染特征
李其林1,黄昀1,骆东奇2
(1:重庆市农业环境保护监测站,重庆 400020;2:广西大学,广西南宁 530005)
摘要:重庆市蔬菜基地土壤中重金属的平均含量分别为Hg mg/kg,Cd mg/kg,Pb mg/kg,As mg/kg,Cr mg/kg;部分基地的土壤受到污染,主要污染物为Hg和Cd。由于城市区划的不同,土壤污染程度为近郊区>工矿区>远郊区。
关键词:土壤;重金属;污染;评价
中图分类号: 文献标识码:A
Contents of Heavy Metals in Soils of the Vegetable Bases of Chongqing
LI Qi-lin1, HUANG Yun1, LUO Dong-qi2
(1: Chongqing Monitoring Station of Agricultural Envioronmental Protection, Chongqing 400020, China; 2: Guangxi University, Nanning 530005, China)
Abstract:The analysis of the contents of heavy metals in soil samples of the vegetable bases of es to a conclution that the average contents of heavy metals in the soils are as follows: Hg , Cd , Pb , As , Cr mg/kg; the soils in the part of the vegetable bases of Chongqing are contaminated, the main contaminants are Hg and Cd. The pollution degree in suburbs is higher than in industrial area and the latter is higher than in the distant suburbs.
Key words:soil; heavy metal; contamination; valuation
重庆市蔬菜基地担负着整个城市居民所需的蔬菜的生产任务。近年来,工业的发展,乡镇企业的蓬勃兴起,部分有毒有害产品生产的转移,工业“三废”的超标排放,化肥、农药的不合理使用等,严重地影响了土壤环境质量,给蔬菜的生产也带来了潜在的威胁,为了摸清整个重庆市蔬菜基地土壤中有毒重金属元素的含量情况,我们对全市18个区、县(市)的蔬菜基地土壤进行了采样和分析。
2 采样与分析
采样
根据土壤类型,土地利用现状及污染源分布三兼顾的原则,在被调查的18个区、县(市)的蔬菜基地共布设了100个采样点。根据布置的采样点,选择有代表性的蔬菜地,用竹削刀取表土层(0~20 cm)土壤5~20个分样组成混合样