Abstract：
:Industrial applications and environmental problems involving the aqueous chemistry of aluminium require an understanding of the speciation of this metal ion at a wide range of concentrations. The formation of polynuclear species is of special interest due to the complexity of the hydrolysis mechanisms and the diversity of the hydrolysis products. Kinetic aspects of speciation are also important considering the different stability ranges of polycationic species formed during the hydrolysis process. In the present paper we report results of systematic studies on the formation of aluminium polycations at room temperature. Automated potentiometric titrations have been used to study the hydrolysis of aluminium-ions in solutions (0.01-0.2 M) on a short time scale (2 min between titrant additions). (27)Al NMR spectroscopy and dynamic light scattering have been used for investigations on a longer time scale (24 h). The effects of alkali strength (KOH, NH(4)OH and KHCO(3)) and concentration (0.45-2.0 M), counterion identity (Cl(-), NO(3)(-), SO(4)(2-)) and ionic strength have been investigated. Optimum conditions for the generation of Al(13)-mer are proposed on short and long time scales. On a short time scale, aluminium chloride and nitrate should be used as starting materials, KOH and KHCO(3) should be used for hydrolysis and experiments conducted at low ionic strength. For solutions that have been left to age, there is a considerable hydrolysis window that can be used to generate significant quantities of the Al(13)-mer that vary little with the alkali used. Al(13)-mer species are not generated from alum as the precursor. The presence of sulphate ions alters the pathway of aluminium polymerisation to form polymeric and solid materials. On the basis of the potentiometric titration data, dynamic light scattering and (27)Al NMR measurements evidence is provided for the detrimental role of sulphate-ions in the formation of Al(13)-mer and an alternative mechanism of aluminium ion polycondensation is proposed, based on the increased stability of monomeric and oligomeric species (dimer and trimer) in the presence of sulphate-ions.
journal_name
J Inorg Biochemjournal_title
Journal of inorganic biochemistryauthors
Perry CC,Shafran KLdoi
10.1016/s0162-0134(01)00326-9subject
Has Abstractpub_date
2001-11-01 00:00:00pages
115-24issue
1-2eissn
0162-0134issn
1873-3344pii
S0162-0134(01)00326-9journal_volume
87pub_type
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journal_title：Journal of inorganic biochemistry
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abstract：:Supranutritional selenium (Se) intake and high serum Se levels have been associated epidemiologically with increased risk for type 2 diabetes, suggesting adverse effects of dietary Se compounds and/or antioxidant selenoenzymes on the sensitivity of target tissues for insulin. Here, we compared the capability of inorga...
journal_title：Journal of inorganic biochemistry
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doi：10.1016/j.jinorgbio.2006.07.012
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pub_type： 杂志文章
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/0162-0134(91)80022-a
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2015.03.008
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/0162-0134(89)80026-1
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/0162-0134(92)84012-c
更新日期：1992-03-01 00:00:00
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2012.02.021
更新日期：2012-06-01 00:00:00
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2003.12.014
更新日期：2004-03-01 00:00:00
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2008.03.005
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章,评审
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更新日期：2009-04-01 00:00:00
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2010.03.004
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2012.02.003
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/s0162-0134(00)00198-7
更新日期：2001-01-15 00:00:00
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2005.05.014
更新日期：2005-08-01 00:00:00
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2006.07.013
更新日期：2006-11-01 00:00:00
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2005.07.005
更新日期：2005-10-01 00:00:00
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pub_type： 杂志文章
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2004.11.008
更新日期：2005-01-01 00:00:00
abstract：:Microperoxidase 8 (MP8) is able to react with alkyl- and aryl-isonitriles (RNC) both in its reduced and oxidized states, to form MP8Fe(II)- and MP8Fe(III)-CNR complexes. The coordination and spin states of these complexes have been fully characterized by UV-visible and resonance Raman spectroscopies. Both MP8Fe(II)- a...
journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2005.02.012
更新日期：2005-05-01 00:00:00
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/0162-0134(94)85004-6
更新日期：1994-11-15 00:00:00
