Dear Stan and others,
I admit I clearly have messed up this matter in my message - maybe the first
hot day here (30 degrees) that hit me. Not very 'precise' of me......
While giving the proper definition below my message. Excuses for my mistake.
This does not mean the subject cannot be considered. So still, if any good
ideas exist, let them know.
Thanks for correcting me Stan.
Certainly I look forward to have some good discussions with you in Lublin.
Pier.
On 22-05-2007 17:31, "Stan Halas" <[log in to unmask]> wrote:
> Dear Pier,
>
> I understand under SPECIATION a term usually used to express specification
> (listing) of fractions of particular chemical compounds in a system.
> This term naturally can be extended to "isotope speciation" of a particular
> chemical compound, eg. D2O, HDO and H2O in the case of deuteriated water.
>
> On the other hand FRACTIONATION = SEPARATION.
> This term may refer to a process or a factor describing the separation
> magnitude.
>
> To see you in Lublin soon for futher discussion!
> Stan
>
> At 11:27 07-05-22 +0200, you wrote:
>> 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/
|
