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Lead Speciation and Bioavailability in Apatite-Amended Sediments
Joint Authors
Mc Dermott, Gregory
Gratson, David
Neptune, Dean
Ryan, James A.
Williams, Aaron G. B.
Scheckel, Kirk G.
Source
Applied and Environmental Soil Science
Issue
Vol. 2011, Issue 2011 (31 Dec. 2011), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2010-12-27
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Earth Science , Water and Environment
Abstract EN
The in situ sequestration of lead (Pb) in sediment with a phosphate amendment was investigated by Pb speciation and bioavailability.
Sediment Pb in preamendment samples was identified as galena (PbS) with trace amounts of absorbed Pb.
Sediment exposed to atmospheric conditions underwent conversion to hydrocerussite and anglesite.
Sediments mixed with apatite exhibited limited conversion to pyromorphite, the hypothesized end product.
Conversion of PbS to pyromorphite is inhibited under reducing conditions, and pyromorphite formation appears limited to reaction with pore water Pb and PbS oxidation products.
Porewater Pb values were decreased by 94% or more when sediment was amended with apatite.
The acute toxicity of the sediment Pb was evaluated with Hyalella azteca and bioaccumulation of Pb with Lumbriculus variegatus.
The growth of H.
azteca may be mildly inhibited in contaminated sediment, with apatite-amended sediments exhibiting on average a higher growth weight by approximately 20%.
The bioaccumulation of Pb in L.
variegatus tissue decreased with increased phosphate loading in contaminated sediment.
The study indicates limited effectiveness of apatite in sequestering Pb if present as PbS under reducing conditions, but sequestration of porewater Pb and stabilization of near-surface sediment may be a feasible and alternative approach to decreasing potential toxicity of Pb.
American Psychological Association (APA)
Scheckel, Kirk G.& Williams, Aaron G. B.& Mc Dermott, Gregory& Gratson, David& Neptune, Dean& Ryan, James A.. 2010. Lead Speciation and Bioavailability in Apatite-Amended Sediments. Applied and Environmental Soil Science،Vol. 2011, no. 2011, pp.1-8.
https://search.emarefa.net/detail/BIM-490747
Modern Language Association (MLA)
Scheckel, Kirk G.…[et al.]. Lead Speciation and Bioavailability in Apatite-Amended Sediments. Applied and Environmental Soil Science No. 2011 (2011), pp.1-8.
https://search.emarefa.net/detail/BIM-490747
American Medical Association (AMA)
Scheckel, Kirk G.& Williams, Aaron G. B.& Mc Dermott, Gregory& Gratson, David& Neptune, Dean& Ryan, James A.. Lead Speciation and Bioavailability in Apatite-Amended Sediments. Applied and Environmental Soil Science. 2010. Vol. 2011, no. 2011, pp.1-8.
https://search.emarefa.net/detail/BIM-490747
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-490747