摘要
以塑料、化工、火电、养殖行业污染土壤为研究对象,通过对土壤中重金属的总量和化学形态进行分析,比较了这4种行业土壤重金属的污染特征。结果表明,这些行业土壤中重金属含量均高于该地背景值,部分指标超出了国家标准规定的土壤环境质量二级标准值,各行业土壤重金属内梅罗综合污染指数从大到小依次是化工行业1.74、火电行业1.40、塑料行业1.39、养殖行业0.82。按照土壤综合污染分级标准,塑料行业、化工行业、火电行业污染等级已达到轻污染,养殖行业处于警戒级。对土壤中重金属的有效态研究发现,4种行业土壤中重金属有效态含量差异较大,土壤重金属有效态含量主要受重金属的全量、土壤pH及有机质影响,还与各行业排放污染物中重金属的排放特征、原始形式有关。
This study was conducted to compare the total contents and chemical forms of heavy metals in soils from different industries such as plastics, chemical, heat-engine plant and breeding. The results showed that soil heavy metal contents of these industries were higher than that of local background content, and some indicators exceeded the national recommended Environmental Quality Secondary Standard for Soils. The comprehensive pollution index of heavy metal for each industry showed a decreasing order as 1.74 for chemical industry, 1.40 for the heat-engine plant, 1.39 for the plastic industry and 0.82 for breeding industry. According to the grading standards of soil pollution, the plastic industry, the chemical industry and the heat- engine plant reached the light level, but breeding industry reached the alert level. This study also found that the contents of heavy metal available form had great difference among kinds of industries. Moreover, the factors affected soil heavy metals available form were not only included the total contents, pH and soil organic matter, but also included the emission characteristics of heavy metals in the discharge of pollutants and the original form from different industries.
出处
《土壤》
CAS
CSCD
北大核心
2013年第6期1023-1027,共5页
Soils
基金
国家环保公益项目(201109024,201309003)
国家高技术研究发展计划(863计划)项目(SQ2009AA06XK1482462)资助
关键词
土壤重金属
污染特征
涉重行业
Heavy metals in soils, Pollution characteristics, Industries related to heavy metals
