Dear Pier,

if you are interested in isotope fractionation between ion pairs/complexes
and their corresponding free ions (e.g., CaSO4° versus SO42-) this is
clearly a very interesting topic. Especially in disequilibrium systems,
were reaction kinetics can become important. Although some systems can be
followed by experimental approaches we are in need for theoretical
predictions.


>>> Dear all,
>>>
>>> I like to hear from you about interest on the topic of isotopic
>>> speciation
>>> in relation to isotopic analysis. Below are given some definitions on
>>> 'speciation'.
>>> Isotopic speciation in analysis is, what I think, a very much neglected
>>> subject, where only few studies bother about
>>> 'homogeneity/heterogeneity'
>>> (basically a speciation problem) considering the sample-size used for
>>> analysis.
>>> I like to give it more attention and propose to have a session on this
>>> subject for the next EGU meeting in 2008. A tentative session-title may
>>> be:
>>> 'Isotopic distribution in samples (speciation) in isotopic analysis'
>>> (isotope includes here stable and radiogenic isotopes).
>>>
>>> Please, I like to get your reactions on my proposal. Any comment,
>>> suggestion, or proposal is very welcome.
>>>
>>> I look forward for some discussion here....
>>>
>>> Best wishes,
>>> Pier.
>>>
>>> ************
>>> For those less introduced in this subject [from: EVISA web-site:
>>> http://www.speciation.net/Public/Document/2003/09/11/495.html;
>>> EVISA = European Virtual Institute of Speciation Analysis]:
>>> Speciation as a discipline in Analytical Chemistry ­ Definitions
>>>
>>> The International Union for Pure and Applied Chemistry (IUPAC) has
>>> published
>>> guidelines or recommendations for the definition of speciation
>>> analysis:
>>> Speciation analysis is the analytical activity of identifying and/or
>>> measuring the quantities of one or more individual chemical species in
>>> a
>>> sample.
>>>
>>> The chemical species are specific forms of an element defined as to
>>> isotopic
>>> composition, electronic or oxidation state, and/or complex or molecular
>>> structure.
>>>
>>> The speciation of an element is the distribution of an element amongst
>>> defined chemical species in a system.
>>>
>>> In case that it is not possible to determine the concentration of the
>>> different individual chemical species that sum up the total
>>> concentration of
>>> an element in a given matrix, that means it is impossible to determine
>>> the
>>> speciation, it is a usefull practice to do fractionation instead.
>>>
>>> Fractionation is the process of classification of an analyte or a group
>>> of
>>> analytes from a certain sample according to physical (e.g. size,
>>> solubility)
>>> or chemical (e.g. bonding, reactivity) properties.
>>>
>>> Further reading:
>>> D.M. Templeton, F. Ariese, R. Cornelis, L.-G. Danielsson, H. Muntau,
>>> H.P.
>>> van Leeuwen, R. Lobinski, IUPAC Guidelines for Terms Related to
>>> Speciation
>>> of Trace Elements, Pure Appl. Chem., 72/8 (2000) 1453-1470.
>>>
>>> **********
>>> Dr. Pier A. de Groot
>>> Address for the period April 1, 2007 ­ July 31, 2007:
>>> Silesian University of Technology
>>> GADAM Centre of Excellence
>>> Institute of Physics ­ Department of Radioisotopes
>>> Krzywoustego 2, 44 100 Gliwice, Poland
>>> Email: [log in to unmask]
>>>
>>> Permanent address:
>>> Delta Isotopes Consultancy
>>> Pastoor Moorkensstraat 16
>>> 2400 Mol - Achterbos
>>> Belgium
>>> Tel. +32 (0)14 326 205
>>> e-mail: [log in to unmask] or [log in to unmask]
>>>
>>> Associate editor for stable isotopes of eEarth on-line magazine
>>> http://www.electronic-earth.net
>>>
>>> Head of Isotopes in Geosciences of the European Geoscience Union (EGU).
>>> EGU Home web-site: http://www.copernicus.org/EGU/EGU.html
>>>
>>> Organization Committee member of BASIS (Benelux Association of Stable
>>> Isotope Scientists).
>>> http://www.basis-online.eu/
>>>
>>> Visit my WEB-site about my ³Handbook of Stable Isotope Analytical
>>> Techniques², with a link to the Elsevier web site on the handbook
>>> (marked:
>>> ŒOrder Now¹):
>>> http://users.pandora.be/handbook/index.html
>>> last update: August 15, 2005
>>> Volume I is now available. Volume II is expected to be available in
>>> 2007.
>>>
>>> ****************************************************************
>>
>> Dr. Stanislaw Halas
>> Mass Spectrometry Laboratory
>> Institute of Physics, UMCS
>> 20-031 Lublin, Poland
>> phone: +48 81 537-62-75
>> fax: +48 81 533-36-69
>>
>
> --
> Pier de Groot
> Silesian University of Technology, Institute of Physics
> Department of Radioisotopes, GADAM Centre of Excellence
> Krzywoustego 2, 44-100 Gliwice, POLAND
> tel. +48 32 237 2662, fax. +48 32 237 2254
> E-mail: [log in to unmask]
> http://www.carbon14.pl/
>