摘要
采用BCR连续提取法研究了污泥中Cd、Pb和Zn的化学形态分布,并通过室内土培实验研究了其在小麦幼苗中的富集效应。研究结果表明,Pb和Cd在污泥中主要以残渣态存在,相对比较稳定;Zn则主要以可交换态和可还原态存在,具有较强的潜在生物有效性。污泥中3种金属的潜在生物有效性由强到弱的顺序为:Zn>Cd>Pb。比较污泥中的Zn、Pb、Cd在小麦根和叶中的富集系数(EC),可发现3种金属在根中的富集系数均大于其在叶中的富集系数,说明小麦根部对这3种金属的富集能力大于其茎叶部分。3种金属在小麦中富集能力的强弱顺序在茎叶中为Zn>Cd>Pb,此结果与金属形态分析的结果相吻合。
BCR sequential extraction process was employed to investigate the fraction distribution of Cd, Pb and Zn in sewage sludge samples. The enrichment of these metals in wheat seeding was also studied by sludge cultivating experiments in laboratory. Results showed that Pb and Cd mainly distributed in the residual fraction were in relative inert status in sludge while Zn principally in exchangeable and reducible fraction has strong potential bioavailability. The enrichment coefficient of these three metals from sludge to shoots of wheat seeding were much bigger than that of roots, which indicated that the metals in sludge accumulated more in roots than in shoots of wheat seeding.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2007年第3期1-3,6,共4页
Environmental Science & Technology
基金
国家"973"研究项目(2002CB412303)
江苏省自然科学基金(BK2004115)
关键词
污泥
重金属
形态
小麦幼苗
富集系数
sludge
heavy metal
fraction
wheat seeding
enrichment coefficient
