长江口悬浮固体中重金属元素的形态研究

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

Study on the Morphology of Heavy Metals on Suspended Solids in Changjiang Estuary

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.