Trace metals in porewater of surface sediments and their bioavailability in Jiaozhou Bay, Qingdao, China

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	Trace metals in porewater of surface sediments and their bioavailability in Jiaozhou Bay, Qingdao, China
	Ye, SY (Ye, Siyuan); Laws, EA (Laws, Edward A.); Ding, XG (Ding, Xigui); Yuan, HM (Yuan, Hongming); Zhao, GM (Zhao, Guangming); Wang, J (Wang, Jin)
刊名	ENVIRONMENTAL EARTH SCIENCES
	2011
卷号	64 期号:6 特刊 SI 页码:1641-1646
关键词	Trace metals Bioavailability Species Porewater Geochemical modeling Jiaozhou Bay China
ISSN号	1866-6280
英文摘要	Samples of porewater and the edible tissue of mottled clams, Ruditapes variegatus, were collected simultaneously at each of 12 stations from Jiaozhou Bay near Qingdao, China, in June of 2003. Chemical analysis focused on trace metals and major elements. Porewater concentrations of Cd, Cr, Pb, and Zn were distributed in a bimodal fashion among the 12 stations, with mean concentrations at six of the stations being 8-32 times mean values at the other six stations. The concentrations of the same metals in clams were remarkably similar among stations, the coefficients of variation being only 12-37%. Calculations performed with the computer program PHREEQC indicated that Pb and Cr in porewater were present only in the +2 and +3 states, respectively, and because dissolved Cd and Zn exist only in the +2 state, the bimodal distribution of these four metals likely reflects secondary effects associated with their scavenging by Fe and/or Mn under oxidizing conditions and subsequent dissolution in the reducing environment of the porewaters. Consistent with this hypothesis is the fact that the distribution of high and low metal concentrations was closely correlated with the granularity of the sediment, with lower metal concentrations associated with relatively coarse sediment. Comparison of published biological concentration factors with the ratios of metal concentrations in the clams to porewater metal concentrations indicated that the porewaters were not the primary sources of the metals in the clams. Mixing processes in the bay likely account for the rather uniform concentrations of metals in clam tissue.
学科主题	海洋地质学
WOS关键词	SPECIATION
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000296360600015
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39247]
专题	中国地质调查局
作者单位	Louisiana State Univ, Baton Rouge, LA 70803 USA
推荐引用方式 GB/T 7714	Ye, SY ,Laws, EA ,Ding, XG ,et al. Trace metals in porewater of surface sediments and their bioavailability in Jiaozhou Bay, Qingdao, China[J]. ENVIRONMENTAL EARTH SCIENCES,2011,64(6 特刊 SI):1641-1646.
APA	Ye, SY ,Laws, EA ,Ding, XG ,Yuan, HM ,Zhao, GM ,&Wang, J .(2011).Trace metals in porewater of surface sediments and their bioavailability in Jiaozhou Bay, Qingdao, China.ENVIRONMENTAL EARTH SCIENCES,64(6 特刊 SI),1641-1646.
MLA	Ye, SY ,et al."Trace metals in porewater of surface sediments and their bioavailability in Jiaozhou Bay, Qingdao, China".ENVIRONMENTAL EARTH SCIENCES 64.6 特刊 SI(2011):1641-1646.