摘要
研究了长江口水体中微量金属元素Cu、Pb、Zn、Cd,在固—液两相中的分配,以及在悬浮固体中的形态分布。结果表明,元素Cu、Pb、Zn有90％左右存在于悬浮固体中,并以固态形式输入河口,溶解态仅占10％左右;元素Cd固态部分约占35％,溶解态占优势。在悬浮固体中,元素Cu、Pb、Zn主要以残留态和铁锰结合态形式存在,这两种形态的比例,Cu为40％和29％,Pb各占40％,Zn为37％和38％。元素Cd主要以可交换态和碳酸盐结合态形式存在,分别占47％和30％。温度、pH值、盐度等环境因素对上述元素的形态分布和固—液相之间的转化均有影响,尤其是对元素Cd的影响较大。
Study on the partition between solid and liquid phases and the morphological distribution and transformation of trace heavy metals Cu, Zn, Pb, and Cd in the water body of changjiang estuary have been done. It was found that about 90% of Cu, Pb and Zn existed on suspended solids and converged into the estuary in solid state, among which Cd occupied about 35% in solid state and dominated in soluble state. On suspended solids, Cu, Zn and Pb mainly occurred in residual or Fe/Mn binding form, and the ratio of these two forms were Cu 40% and 29%, both 40% for Pb, and Zn 37% and 38%. Cd existed as 17% in exchangeable form and 30% in carbonate binding form. Variation of environmental factors, such as temperature, pH value and salinity etc. may have different effects on morphology of the above elements and transformation of solid-liquid phase, especially for Cd.
出处
《上海环境科学》
CAS
CSCD
1994年第11期7-9,35,共4页
Shanghai Environmental Sciences
