The behaviour of 134Cs, 60Co, and 85Sr radionuclides in marine environmental sediment.
Identifieur interne : 000076 ( PubMed/Corpus ); précédent : 000075; suivant : 000077The behaviour of 134Cs, 60Co, and 85Sr radionuclides in marine environmental sediment.
Auteurs : Nariman H M. KamelSource :
- TheScientificWorldJournal [ 1537-744X ] ; 2002.
English descriptors
- KwdEn :
- Absorption, Adsorption, Cations (chemistry), Cesium Radioisotopes (chemistry), Cobalt Radioisotopes (chemistry), Egypt, Geologic Sediments (chemistry), Hydrogen-Ion Concentration, Ions (analysis), Models, Chemical, Seawater, Strontium Radioisotopes (chemistry), Surface Properties, Trace Elements (analysis).
- MESH :
- chemical , analysis : Ions, Trace Elements.
- chemical , chemistry : Cations, Cesium Radioisotopes, Cobalt Radioisotopes, Strontium Radioisotopes.
- geographic : Egypt.
- chemistry : Geologic Sediments.
- Absorption, Adsorption, Hydrogen-Ion Concentration, Models, Chemical, Seawater, Surface Properties.
Abstract
This work describes experimental investigations and modelling studies on the sorption of radionuclides 134Cs, 60Co, and 85Sr by certain marine sediments within Egypt. The chemical composition of the marine sediments was determined. The soluble salts were measured for the sediments and the concentrations of the released cations, Al3+, Fe3+, and Si4+, were measured for the sediment materials in 0.1 M NaClO4 aqueous solution at different hydrogen ion concentrations. The two main factors that control the uptake of the radionuclides onto the sediment are the pH and the exchangeable capacities of the sediment materials. Surface complex model was used to estimate the surface charge densities and the electric surface potential of the marine sediment materials. These two parameters were calculated at the surface capacity sites of the sediment materials. The desorption of the adsorbed cations was determined by means of selective consecutive extraction tests using different chemical reagents including (1) 1 M MgCl2 (pH 7), (2) 1 M ammonium oxalate (pH 3-5), (3) 0.04 M NH2OH,HCl in 25% acetic acid (pH 3-4), (4) H2O2 in 5% HNO3(pH 2-3), and (5) digestion with nitric acid followed by hydrofluoric and perchloric acids (pH 2).
DOI: 10.1100/tsw.2002.290
PubMed: 12806132
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pubmed:12806132Le document en format XML
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The chemical composition of the marine sediments was determined. The soluble salts were measured for the sediments and the concentrations of the released cations, Al3+, Fe3+, and Si4+, were measured for the sediment materials in 0.1 M NaClO4 aqueous solution at different hydrogen ion concentrations. The two main factors that control the uptake of the radionuclides onto the sediment are the pH and the exchangeable capacities of the sediment materials. Surface complex model was used to estimate the surface charge densities and the electric surface potential of the marine sediment materials. These two parameters were calculated at the surface capacity sites of the sediment materials. The desorption of the adsorbed cations was determined by means of selective consecutive extraction tests using different chemical reagents including (1) 1 M MgCl2 (pH 7), (2) 1 M ammonium oxalate (pH 3-5), (3) 0.04 M NH2OH,HCl in 25% acetic acid (pH 3-4), (4) H2O2 in 5% HNO3(pH 2-3), and (5) digestion with nitric acid followed by hydrofluoric and perchloric acids (pH 2).</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">12806132</PMID><DateCreated><Year>2003</Year><Month>6</Month><Day>13</Day></DateCreated><DateCompleted><Year>2004</Year><Month>04</Month><Day>05</Day></DateCompleted><DateRevised><Year>2003</Year><Month>6</Month><Day>13</Day></DateRevised><Article PubModel="Electronic"><Journal><ISSN IssnType="Electronic">1537-744X</ISSN><JournalIssue CitedMedium="Internet"><Volume>2</Volume><PubDate><Year>2002</Year><Month>Jun</Month><Day>07</Day></PubDate></JournalIssue><Title>TheScientificWorldJournal</Title><ISOAbbreviation>ScientificWorldJournal</ISOAbbreviation></Journal><ArticleTitle>The behaviour of 134Cs, 60Co, and 85Sr radionuclides in marine environmental sediment.</ArticleTitle><Pagination><MedlinePgn>1514-26</MedlinePgn></Pagination><Abstract><AbstractText>This work describes experimental investigations and modelling studies on the sorption of radionuclides 134Cs, 60Co, and 85Sr by certain marine sediments within Egypt. The chemical composition of the marine sediments was determined. The soluble salts were measured for the sediments and the concentrations of the released cations, Al3+, Fe3+, and Si4+, were measured for the sediment materials in 0.1 M NaClO4 aqueous solution at different hydrogen ion concentrations. The two main factors that control the uptake of the radionuclides onto the sediment are the pH and the exchangeable capacities of the sediment materials. Surface complex model was used to estimate the surface charge densities and the electric surface potential of the marine sediment materials. These two parameters were calculated at the surface capacity sites of the sediment materials. The desorption of the adsorbed cations was determined by means of selective consecutive extraction tests using different chemical reagents including (1) 1 M MgCl2 (pH 7), (2) 1 M ammonium oxalate (pH 3-5), (3) 0.04 M NH2OH,HCl in 25% acetic acid (pH 3-4), (4) H2O2 in 5% HNO3(pH 2-3), and (5) digestion with nitric acid followed by hydrofluoric and perchloric acids (pH 2).</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Kamel</LastName><ForeName>Nariman H M</ForeName><Initials>NH</Initials><AffiliationInfo><Affiliation>Radiation Protection Department, Nuclear Research Center, Atomic Energy Authority,P. O. 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