摘要
对H市工业区土壤-稻米-谷壳体系中重金属的迁移累积特征进行分析,结果显示,不同重金属元素的迁移累积特征不同,Cd易于从土壤中向稻谷籽实迁移,而Cu,Zn,Cr,Ni,As和Hg等迁移能力则较弱.水稻籽实中不同重金属在稻米和谷壳之间的分配规律不同.营养元素Cu和Zn有向稻米迁移累积的趋势,而有毒有害重金属Pb,Cd,Cr,Ni和As则主要累积于谷壳中,Cr和Ni在稻米和谷壳之间的分配较均衡.重金属在稻米中的累积能力为:Cd>Zn>Ni>Cu>Pb>Cr>Hg>As,而在谷壳中则为:Cd>Pb>Ni>Zn>Cr>Cu>As>Hg.
Concentrations of heavy metals were determined in rice and rooted soil samples collected in industrial area around city. The translocation and accumulation behavior of heavy metals in the soil-brown rice-chaff system were different significantly as Cd tended to move from rooted soil to rice while Cu, Zn, Cr, Ni, As and Hg was still detained in soil. The distribution patterns of heavy metals between brown rice and chaff could be divided into three types ： （ 1 ） elements which tended to accumulate in brown rice, such as Cu and Zn ; （2） elements which tended to accumulate in chaff, such as Pb, Cd, Cr, Ni and As; （3） elements which tended neither to accumulate in chaff, nor to brown rice such as Hg. As being showed by the transfer factors, the transformation ability of heavy metals were different between brown rice and chaff. The ability of eight heavy metals in brown rice was Cd 〉 Zn 〉 Ni 〉 Cu 〉 Pb 〉 Cr 〉 Hg 〉 As, and Cd 〉 Pb 〉 Ni 〉 Zn 〉 Cu 〉 Cr 〉 As 〉 Hg in chaff.
出处
《环境化学》
CAS
CSCD
北大核心
2008年第2期226-230,共5页
Environmental Chemistry
基金
国土资源大调查项目资助(项目编号:12120100511103)
关键词
土壤
水稻
重金属
soil, rice, heavy metals.
