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Partitioning of heavy metals in the surface sediments of Quanzhou Bay wetland and its availability to Suaeda australis 被引量:2

Partitioning of heavy metals in the surface sediments of Quanzhou Bay wetland and its availability to Suaeda australis
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摘要 In order to investigate distributions of heavy metal pollution in Quanzhou Bay wetland, the total concentration and chemical partitioning of a number of heavy metals (Cu, Zn, Cd, Pb, Cr, Hg) in sediments of three sampling sites of Quanzhou Bay wetland and their availability to Suaeda australis were analyzed. The Geoaccumulation Index (Igeo) values reveal that the sediments of three sampling sites may all be considered as moderately contaminated for Pb and Zn, and all sediments might be strongly contaminated with cadmium. The partitioning analyses revealed the measured heavy metals in three sites are bound to the exchangeable fraction at lower concentrations. The measured metals in a considerable amount are bound to the reducible and oxidizable fractions, and a high proportion of the measured heavy metals were distributed in the residual fraction in the sediment samples. The concentrations of Cd in each chemical phase extracted from the sediments are above natural global background levels and should be further investigated because of its toxicity. Suaeda australis has different accumulation abilities for the measured heavy metals. For the root and stem, the bioaccumulation ability assessed by bioaccumulation factor (BAF) for the measured heavy metals follows the decreasing order as: Cu〉Cr〉 Zn〉Cd, Pb, Hg. In the leaf, stronger bioaccumulation ability for Hg is exhibited. The heavy metal concentrations in Suaeda australis roots have positive correlations with their available fractions, while the exchangeable fraction of Cu and Cd might have be more important to both mature plant roots and seedling roots uptake than other fractions; as for Cr, the oxidizable fraction might make a greater contribution to the plant root uptake; as for Zn, the reducible fraction might make so contribution ; and for Pb, the oxidizable fraction might make a significant contribution to the mature plant root uptake, however, the exchangeable fraction might have a significant contribution to the seedling root uptake. In order to investigate distributions of heavy metal pollution in Quanzhou Bay wetland, the total concentration and chemical partitioning of a number of heavy metals (Cu, Zn, Cd, Pb, Cr, Hg) in sediments of three sampling sites of Quanzhou Bay wetland and their availability to Suaeda australis were analyzed. The Geoaccumulation Index (Igeo) values reveal that the sediments of three sampling sites may all be considered as moderately contaminated for Pb and Zn, and all sediments might be strongly contaminated with cadmium. The partitioning analyses revealed the measured heavy metals in three sites are bound to the exchangeable fraction at lower concentrations. The measured metals in a considerable amount are bound to the reducible and oxidizable fractions, and a high proportion of the measured heavy metals were distributed in the residual fraction in the sediment samples. The concentrations of Cd in each chemical phase extracted from the sediments are above natural global background levels and should be further investigated because of its toxicity. Suaeda australis has different accumulation abilities for the measured heavy metals. For the root and stem, the bioaccumulation ability assessed by bioaccumulation factor (BAF) for the measured heavy metals follows the decreasing order as: Cu〉Cr〉 Zn〉Cd, Pb, Hg. In the leaf, stronger bioaccumulation ability for Hg is exhibited. The heavy metal concentrations in Suaeda australis roots have positive correlations with their available fractions, while the exchangeable fraction of Cu and Cd might have be more important to both mature plant roots and seedling roots uptake than other fractions; as for Cr, the oxidizable fraction might make a greater contribution to the plant root uptake; as for Zn, the reducible fraction might make so contribution ; and for Pb, the oxidizable fraction might make a significant contribution to the mature plant root uptake, however, the exchangeable fraction might have a significant contribution to the seedling root uptake.
出处 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2006年第2期334-340,共7页 环境科学学报(英文版)
基金 TheKeyN ationalNaturalScienceFoundationofChina (N o.30530150),theNationalN aturalScienceFoundationofChina(No.30470301),theY outhScienceandTechnologyInnovationProjectofFujianProvince(N o.2004J053)andtheProjectofFujianEducationCouncil(No.JA 02251)
关键词 BIOAVAILABILITY geoaccumulation factor partitioning heavy metals Suaeda australis sediment Quanzhou Bay wetland bioavailability geoaccumulation factor partitioning heavy metals Suaeda australis sediment Quanzhou Bay wetland
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参考文献18

  • 1Babukutty Y,Chacko J,1995.Chemical partitioning and bioavailability of lead and nickel in an estuarine system [J].Environmental Toxicology and Chemistry,14(3):427-434.
  • 2Carter M R,1993.Soil sampling and methods of analysis [M].In:Canadian society of soil science.Boca Raton,USA:Lewis Publishers.
  • 3Gregorio G,Andrea L Z,Angel F,2005.Evaluation of heavy metal availability prior to an in situ soil phytoremediation program[J].Biodegradation,16(2):187-194.
  • 4Howari F M,Banat K M,2001.Assessment of Fe,Zn,Cd,Hg,and Pb in Jordan and Yarmouk river sediments in relation to their physicochemical properties and sequential extraction characterization[J].Water Air and Soil Pollution,132:43-59.
  • 5Huang Z G,2002.A comprehensive scientific survey report of Quanzhou Bay estuarine wetland natural reserve [M].Beijing:Ocean Press.
  • 6Jin Q,Shan X Q,Wang Z J et al.,1996.Distribution and plant availability of heavy metals in different particle-size fractions of soil[J].Science of the Total Environment,187:131-141.
  • 7Jones B,Turki A,1997.Distribution and speciation of heavy metals in surficial sediments from the Tees estuary,north-east England[J].Marine Pollution Bulletin,34(10):768-779.
  • 8Luoma S N,1983.Bioavailability of heavy metals to aquatic organisms-A review[J].Science of the Total Environment,28:1-22.
  • 9Luoma S N,Bryan G W,1979.Heavy metal bioavailability:Modeling chemical and biological interactions in sediment bound zinc[M].In:Chemical modeling in aqueous systems (E.A.Jenne,ed.).Washington,DC:ACS Symposium Series 93.American Chemical Society,577-604.
  • 10Muller G,1969.Index of geoaccumulation in sediments of the Rhine River[J].Journal of Geology,2:109-118.

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