摘要
对长期灌溉电池废水的麦田土壤重金属含量及形态分布研究表明,污灌土壤中Cd、Ni、Zn和Cu含量分别是国家土壤环境质量二级标准的209.92倍、35.59倍、12.49倍和2.86倍,Cr含量能达标;形态分析结果表明,污染最严重的Cd主要以铁-锰氧化物结合态存在,Ni主要以铁-锰氧化物结合态和残渣态存在,Zn主要以残渣态存在,Cu主要以有机结合态存在,Cr主要以铁-锰氧化物结合态和残渣态存在,与对照相比污灌降低了Cd、Ni、Zn、Cu和Cr残渣态所占比例,提高了重金属迁移能力和生物有效性。在四种超标元素中,由于Cd可交换态含量所占比例最高,其向小麦大量迁移造成污染的风险最高。
The results obtained from the determination of heavy metals in the batteries wastewater irrigation soils showed that content of Cr achieved the National Environmental quality standard for soils, while Cd, Zn, Ni and Cu contents were 209.92. 35.59, 12.49 and 2.86 times of the standard, respectively. Cd was dominated by iron-manganese oxides fraction. Ni was dominated by iron-manganese oxides fraction and residual bound fraction. Zn was dominated by residual bound fraction. Cu was dominated by organic fraction. Compared with the non-contaminated irrigation soils, percentage of Cd, Ni, Zn, Cu and Cr residual fractions in the contaminated soils reduced, which could increase the heavy metal mobility and bioavailability. For exchangeable fraction of Cd, being higher than that of Zn, Ni and Cu, the mobility and contamination risk was higher for soil Cd to wheat.
出处
《土壤通报》
CAS
CSCD
北大核心
2009年第5期1181-1184,共4页
Chinese Journal of Soil Science
基金
河南省自然科学基金项目(0611012000)
新乡市科技攻关项目(06S049)
关键词
电池废水
土壤
重金属
形态分布
Batteries wastewater
Soil
Heavy metals
Speciation
