Dear M. Bertal,

I just had a look at your website, and it seems you have quite an assortment
of products we need on a regular basis. I would appreciate it if you could
send me a pricelist of the most common products for EA-IRMS (solids,
liquids). Prices of cups, spare parts, etc...would be very welcome.

Best regards,

Peter.
---
Peter Vervloedt
University of Ghent
Faculty of Agricultural and Applied Biological Sciences
Department of Applied Analytical and Physical Chemistry
Coupure 653
9000 Gent
BELGIUM

tel.:  +32 9 264 6000
fax.: +32 9 264 6230
---

-----Oorspronkelijk bericht-----
Van: Laurent BERTAL <[log in to unmask]>
Aan: [log in to unmask] <[log in to unmask]>
Datum: vrijdag 26 januari 2001 10:35
Onderwerp: Re: [ISOGEOCHEM] 13C analysis on samples with high S-content


>Dear M Vervloedt,
>You can trap Sulfur using Silver woll we can provide. We have manufacture
>one special wool in silver foil, much more efficient and easy to operate
>than those made of silver wire.
>You also have possibility to use Silver capsules (we acn also provide)to
>introduce your sample. In that case you will trap Sulphur directly in
>combustion. Be carrefull you will not have flash combustion, but you will
>have more oxygen available. So you have to check if carbone combustion is
>complete.
>Please let me know, how do you feel your combustion tube in your analyser?
>If you need some samples of silver wool or capsules for trials, just let me
>know
>
>
>Sincères salutations/ Best regards
>
>Laurent Bertal
>Gérant/Manager
>Courtage Analyses Services
>85 Chemin de Clères
>76130 Mt St Aignan
>tel + 33 2 35 07 60 00   / Fax +33 2 35 70 64 39
>e-mail : [log in to unmask]
>http://www.onlinecas.com/
>
> -----Original Message-----
>From:   Stable Isotope Geochemistry [mailto:[log in to unmask]]  On
>Behalf Of Peter Vervloedt
>Sent:   Wednesday, January 24, 2001 2:42 PM
>To:     [log in to unmask]
>Subject:        13C analysis on samples with high S-content
>
>Dear Listmembers,
>
>I need some help on the following:
>
>We extracted soils with K2SO4 (0,125M, 50mL), and then freeze dried those
>samples in tin cups. It was the first time we used this technique and
didn't
>realise the danger.
>
>Apparantly the very high sulfur-content in the cups causes serious
>contamination of the GC (we use Anca-SL), when measuring the samples for
>13C.
>
>Are there any of you that have experienced the same problem? Is there a way
>to modify the equipment (to scrub out the sulfur), or is there another way
>to get rid of the sulfur?
>
>Thanks a lot in advance!
>
>Best regards,
>
>Peter
>
>---
>Peter Vervloedt
>Laboratory Of Applied Physical Chemistry
>Ghent University
>Coupure 653
>9000 Gent
>
>tel.: +32 9 264 6000
>       +32 9 264 6048
>fax.: +32 9 264 6230
>---
>-----Oorspronkelijk bericht-----
>Van: Stable Isotope Geochemistry <[log in to unmask]>
>Aan: [log in to unmask] <[log in to unmask]>
>Datum: vrijdag 20 oktober 2000 9:06
>Onderwerp: Re: [ISOGEOCHEM] Isotopic
>carbonatealterationduetothermaltreatment?
>
>
>Micha,
>
>depending on the water content and the presence of metastable carbonate
>phases in the core there may be transformation of the carbonate fraction
>into
>more stable phases. Depending on a number of boundary conditions O isotope
>exchange may occur. This will probably be not a serious problem for C
>isotopes. During roasting some OM will decompose and create CO2.
>
>Regards, Michael
>
>Micha Horacek wrote:
>
>> Dear isogeochemists,
>>
>> I think I have to formulate my request more precisely:
>>
>> The palmag cores are demagnetised by heating to temperatures above 350° C
>> for at least two hours (but I do not think much longer) and "roasted" at
>> maximum temperature of 500° for twenty minutes.
>> The cores consist of massive rock, not powder. The cores are from impure
>> carbonate rocks with low organic contents.
>> Can the demagnetisation process possibly change the isotope ratios, for
>> example if the carbonate content of the sample is rather small?
>>
>> Cheers,
>> Micha