Speciation of metals in sediment and water in a river underlain by limestone

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dc.contributor.author Korfali, Samira Ibrahim
dc.contributor.author Davies, Brian E.
dc.date.accessioned 2015-11-07T10:43:38Z
dc.date.available 2015-11-07T10:43:38Z
dc.date.copyright 2004
dc.date.issued 2015-11-07
dc.identifier.issn 1093-0191 en_US
dc.identifier.uri http://hdl.handle.net/10725/2478
dc.description.abstract Rivers whose basins are underlain by limestone possess a high buffering capacity for discharged pollutants. During the discharge of metals in the aquatic environment, metals are partitioned between the sediment and the water column phases. Further partitioning of metals occurs within the sediment chemical fractions and metal speciation in water column, thus leading to the possible reduction of the toxic free hydrated metal ion. The present study focuses on one of Lebanon's rivers; the Nahr-Ibrahim whose basin is underlain by limestone and its river water is dominated by carbonate species due to the high pH and alkalinity values. The objectives of this study were: first, to determine the metal speciation (Fe, Zn, Pb and Cd) in the (operationally defined) sediment chemical fractions and metal speciation in river water; second, to evaluate the role of carbonate species in the self-purification process from metal pollutant inputs into the river. Bed sediments and water were collected from eight locations in one dry season (September, 1997), and a sequential chemical fractionation scheme was applied to the <75 μm sieved sediment fraction. The data show that the highest percentages of total metal content in sediment are for: Fe in the residual fraction followed by moderately reducible fraction, Zn and Pb in the carbonate and in the moderately reducible fractions and Cd primarily in the carbonate fraction. Aqueous metal speciation was predicted using AQUACHEM software interfaced to PHREEQC geochemical computer model. The water speciation data predicted that a high percentage of Pb and Zn were present as carbonate species, very low percentages as free hydrated ion species; whereas Cd exhibited high percentage occurrence as a free hydrated metal ion species. Iron was present in water mainly as ferric hydroxide ion pair species. This study has evaluated the role of carbonate species for self-purification process by the reported high percentage occurrence of metals in the carbonate sediment fraction and the interaction of metals with the carbonate water species. en_US
dc.language.iso en en_US
dc.title Speciation of metals in sediment and water in a river underlain by limestone en_US
dc.type Article en_US
dc.description.version Published en_US
dc.title.subtitle Role of carbonate species for purification capacity of rivers en_US
dc.author.school SAS en_US
dc.author.idnumber 197829160 en_US
dc.author.woa N/A en_US
dc.author.department Natural Sciences en_US
dc.description.embargo N/A en_US
dc.relation.journal Advances in Environmental Research en_US
dc.journal.volume 8 en_US
dc.journal.issue 3 en_US
dc.article.pages 599-612 en_US
dc.keywords Metals en_US
dc.keywords Speciation en_US
dc.keywords Sediment en_US
dc.keywords Water en_US
dc.keywords Carbonate en_US
dc.keywords Self-purification en_US
dc.keywords Nahr-Ibrahim river en_US
dc.keywords Lebanon en_US
dc.identifier.doi http://dx.doi.org/10.1007/s10661-010-1713-z en_US
dc.identifier.ctation Korfali, S. I., & Davies, B. E. (2004). Speciation of metals in sediment and water in a river underlain by limestone: role of carbonate species for purification capacity of rivers. Advances in Environmental Research, 8(3), 599-612. en_US
dc.author.email skorfali@lau.edu.lb
dc.identifier.url http://www.sciencedirect.com/science/article/pii/S1093019103000339
dc.orcid.id https://orcid.org/0000-0002-2038-510X en_US

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