A systematic investigation of aluminium ion speciation at high temperature. Part 1. Solution studies.
Identifieur interne : 002222 ( PubMed/Checkpoint ); précédent : 002221; suivant : 002223A systematic investigation of aluminium ion speciation at high temperature. Part 1. Solution studies.
Auteurs : Kirill L. Shafran [Royaume-Uni] ; Carole C. PerrySource :
- Dalton transactions (Cambridge, England : 2003) [ 1477-9226 ] ; 2005.
Abstract
Speciation diagrams of aluminium ions in aqueous solution (0.2 M) at high temperature (90 degrees C) have been obtained from 48 h time-resolved multi-batch titration experiments monitored by 27Al NMR spectroscopy, potentiometry and dynamic light scattering. The quantitative speciation patterns and kinetic data obtained offer a dynamic picture of the distribution of soluble and insoluble Al species as a function of hydrolysis ratio h(h=[OH-]/[Al3+]) over a very broad range of conditions (-1.0 < or =h < or = 4.0). Monomeric, small oligomeric, tridecameric (the 'Al13-mer') and the recently characterised 30-meric aluminium species (the 'Al30-mer') as well as aluminium hydroxide have been identified and quantified. The Al13-mer species dominates over a relatively broad range of hydrolysis ratios (1.5 < or =h< or = 2.7) during the first 6 h of experiment, but are gradually replaced by Al30-mers at longer reaction times. Kinetic profiles indicate that the formation of the Al30-mer is limited by the disappearance of the Al13 species at mildly acidic conditions. The estimated rate constants of both hydrolytic processes show good internal correlation at h> or = 1.5. The effect of local perturbations leading to the formation of aluminium hydroxide below the electroneutrality point (h= 3.0) has been estimated quantitatively.
DOI: 10.1039/b502097b
PubMed: 15957049
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Shafran</name><affiliation wicri:level="1"><nlm:affiliation>School of Biomedical and Natural Sciences, Nottingham Trent University, Clifton Lane Clifton, Nottingham, UK.</nlm:affiliation><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>School of Biomedical and Natural Sciences, Nottingham Trent University, Clifton Lane Clifton, Nottingham</wicri:regionArea><wicri:noRegion>Nottingham</wicri:noRegion></affiliation></author><author><name sortKey="Perry, Carole C" sort="Perry, Carole C" uniqKey="Perry C" first="Carole C" last="Perry">Carole C. Perry</name></author></analytic><series><title level="j">Dalton transactions (Cambridge, England : 2003)</title><idno type="ISSN">1477-9226</idno><imprint><date when="2005" type="published">2005</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Speciation diagrams of aluminium ions in aqueous solution (0.2 M) at high temperature (90 degrees C) have been obtained from 48 h time-resolved multi-batch titration experiments monitored by 27Al NMR spectroscopy, potentiometry and dynamic light scattering. The quantitative speciation patterns and kinetic data obtained offer a dynamic picture of the distribution of soluble and insoluble Al species as a function of hydrolysis ratio h(h=[OH-]/[Al3+]) over a very broad range of conditions (-1.0 < or =h < or = 4.0). Monomeric, small oligomeric, tridecameric (the 'Al13-mer') and the recently characterised 30-meric aluminium species (the 'Al30-mer') as well as aluminium hydroxide have been identified and quantified. The Al13-mer species dominates over a relatively broad range of hydrolysis ratios (1.5 < or =h< or = 2.7) during the first 6 h of experiment, but are gradually replaced by Al30-mers at longer reaction times. Kinetic profiles indicate that the formation of the Al30-mer is limited by the disappearance of the Al13 species at mildly acidic conditions. The estimated rate constants of both hydrolytic processes show good internal correlation at h> or = 1.5. The effect of local perturbations leading to the formation of aluminium hydroxide below the electroneutrality point (h= 3.0) has been estimated quantitatively.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">15957049</PMID><DateCompleted><Year>2007</Year><Month>03</Month><Day>13</Day></DateCompleted><DateRevised><Year>2005</Year><Month>06</Month><Day>15</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">1477-9226</ISSN><JournalIssue CitedMedium="Print"><Issue>12</Issue><PubDate><Year>2005</Year><Month>Jun</Month><Day>21</Day></PubDate></JournalIssue><Title>Dalton transactions (Cambridge, England : 2003)</Title><ISOAbbreviation>Dalton Trans</ISOAbbreviation></Journal><ArticleTitle>A systematic investigation of aluminium ion speciation at high temperature. Part 1. Solution studies.</ArticleTitle><Pagination><MedlinePgn>2098-105</MedlinePgn></Pagination><Abstract><AbstractText>Speciation diagrams of aluminium ions in aqueous solution (0.2 M) at high temperature (90 degrees C) have been obtained from 48 h time-resolved multi-batch titration experiments monitored by 27Al NMR spectroscopy, potentiometry and dynamic light scattering. The quantitative speciation patterns and kinetic data obtained offer a dynamic picture of the distribution of soluble and insoluble Al species as a function of hydrolysis ratio h(h=[OH-]/[Al3+]) over a very broad range of conditions (-1.0 < or =h < or = 4.0). Monomeric, small oligomeric, tridecameric (the 'Al13-mer') and the recently characterised 30-meric aluminium species (the 'Al30-mer') as well as aluminium hydroxide have been identified and quantified. The Al13-mer species dominates over a relatively broad range of hydrolysis ratios (1.5 < or =h< or = 2.7) during the first 6 h of experiment, but are gradually replaced by Al30-mers at longer reaction times. Kinetic profiles indicate that the formation of the Al30-mer is limited by the disappearance of the Al13 species at mildly acidic conditions. The estimated rate constants of both hydrolytic processes show good internal correlation at h> or = 1.5. The effect of local perturbations leading to the formation of aluminium hydroxide below the electroneutrality point (h= 3.0) has been estimated quantitatively.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Shafran</LastName><ForeName>Kirill L</ForeName><Initials>KL</Initials><AffiliationInfo><Affiliation>School of Biomedical and Natural Sciences, Nottingham Trent University, Clifton Lane Clifton, Nottingham, UK.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Perry</LastName><ForeName>Carole C</ForeName><Initials>CC</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2005</Year><Month>05</Month><Day>16</Day></ArticleDate></Article><MedlineJournalInfo><Country>England</Country><MedlineTA>Dalton Trans</MedlineTA><NlmUniqueID>101176026</NlmUniqueID><ISSNLinking>1477-9226</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>2005</Year><Month>6</Month><Day>16</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2005</Year><Month>6</Month><Day>16</Day><Hour>9</Hour><Minute>1</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2005</Year><Month>6</Month><Day>16</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">15957049</ArticleId><ArticleId IdType="doi">10.1039/b502097b</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Royaume-Uni</li></country></list><tree><noCountry><name sortKey="Perry, Carole C" sort="Perry, Carole C" uniqKey="Perry C" first="Carole C" last="Perry">Carole C. Perry</name></noCountry><country name="Royaume-Uni"><noRegion><name sortKey="Shafran, Kirill L" sort="Shafran, Kirill L" uniqKey="Shafran K" first="Kirill L" last="Shafran">Kirill L. Shafran</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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