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《Acta Mineralogica Sinica》 2007-01
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SPECIATION OF HEAVY METALS IN MUD IN COASTAL RECLAMATION AREAS IN THE SHENZHEN-HONGKONG WESTERN CORRIDOR

HUANG Jian-min1,2,HUANG Run-qiu1(1.The National Laboratory of Geological Hazard Prevention and Geological Environmental Protection,Chengdu University of Technology,Chengdu 610059,China;2.College of Chemistry and Material,Sichuan Normal University,Chengdu 610066,China)  
Large-scale coastal reclamation has been carried out along the coastal areas near Shenzhen,China to build the Shenzhen-Hong Kong western corridor by dumping fill materials over the marine mud at the sea bottom.Changes in the burial conditions of mud and the physical and chemical properties of pore water in the mud may induce the release of some heavy metals in the mud.To understand why some of the heavy metals can be released from the mud more easily than others,a sequential extraction method was used to study the operationally determined chemical forms of five heavy metals(Cu,Ni,Pb,Zn and Cd) in the mud samples.Heavy metals can be presented in five chemical forms: exchangeable,carbonate,Fe Mn oxide,organic and residual.Ni and Pb were mainly associated with the Fe-Mn oxide fraction and carbonate fraction,Zn was mainly associated with organic fraction and Fe-Mn oxide fraction,while Cu and Cd were associated with organic fraction and carbonate fraction,respectively.If the residual fraction can be considered as an inert phase of the metal that cannot be mobilized,it is the other four forms of heavy metal that cause noticeable changes in the concentrationsof heavy metals in mud.On the basis of the speciation of heavy metals,the mobility of metals follows theorder: Pb(39.68%) Cu(31.59%) Zn(20.49%)Ni(12.80%)Cd(10.98%).
【CateGory Index】: P734
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