Can you send a PDF to me, please?

Thanks in advance,
Robert

Wassenaar,Len [NHRC] wrote:
> We have done this approach comparing both liquid and vapour laser units
> and using a liquid to vapour equilibration method and headspace laser
> spectroscopy (continuous flow and manual injection).  The citation in
> ES&T is:
> 
> http://pubs.acs.org/doi/abs/10.1021/es802065s  (or email me for
> preprint)
> 
> Yes it works brilliantly, and while here aimed specifically at
> porewaters, I forsee adaptations to plant and biological water. The
> current weakness of the laser units are limited sample handling/prep
> frontends, and this is where far more R&D and creativity is needed to
> get that sample gas into the chamber.  
> 
> Len
> 
> Leonard I. Wassenaar, Ph.D.
> Stable Isotope Hydrology and Ecology Laboratory
> Environment Canada
> 11 Innovation Blvd.
> Saskatoon, SK
> Canada S7N 3H5
> tel (306) 975-5747
> fax (306) 975-5143
> 
> 
> -----Original Message-----
> From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On
> Behalf Of Attila Demeny
> Sent: Wednesday, December 10, 2008 9:57 AM
> To: [log in to unmask]
> Subject: Re: [ISOGEOCHEM] on-line analysis of water with TC/EA - basic
> questions concerning standards
> 
> Dear All,
> 
> Since laser spectroscopic isotope analysis has been mentioned, I would
> have a question on this. A major problem can be related to water
> impurities, like floating particles or dissolved organic matter (as
> mentioned by Ty Coplen in a personal conversation). One solution to
> overcome this problem could be (?) using a water vapour analyzer instead
> of liquid water one. This type of equipment is supplied by both LGR and
> Picarro.
> 
> I would think about analysing headspace H2O over water samples. In this
> case no filtering is needed except for dirty waters. The liquid-vapour
> fractionation is not very T dependent, 0.1 oC would cause 0.01 permill
> change in d18O and 0.1 permill in dD. However, fractionation during the
> analysis due to continuous vapour removal and evaporation, and
> condensation on the way to the analyzer may be problematic.
> 
> I would be grateful to get advice from those who has experience with
> vapour analyzer or both vapour and liquid ones. This is especially
> interesting for me as we plan to get one next year, so I would like to
> choose the right one.
> 
> Thanks in advance.
> 
> Attila
> 
> --
> *******************************************************************
> Dr. Attila Demeny
> Institute for Geochemical Research, Hungarian Academy for Sciences
> Budapest, Budaorsi ut 45, H-1112, Hungary
> Tel: (361-)309-2681, Tel/fax: (361-)319-3137
> e-mail: [log in to unmask], web: Http://www.geochem.hu/
> *******************************************************************
> 
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-- 
Robert van Geldern
Rennesstrasse 2
91054 Erlangen
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