Hi Robert

Our experience is much the same as Axel's that the Cr reactors are not the same once cooled and reused. We see a shift in d2H (which we could correct for) and also a reduction in precision. We also run a fair amount of saline waters, which seem to shorten the reactor life and may preclude reuse. Our reactors are locally made (much cheaper than the Finnigan ones) and we have succesfully had our glass blower cut, clean, and reconstruct them without any noticable problems. Given that, we've not been tempted to play with reusing partially consumed ones.

Cheers

Ian


______________________________________
Dr Ian Cartwright
Reader, Groundwater & Stable Isotopes
School of Geosciences
Monash University
Clayton Vic 3800, Australia

Tel: +61 3 9905-4887 / 4879
Fax: +61 3 9905-4903

...water, our greatest resource

----- Original Message -----
From: "Geldern, Robert" <[log in to unmask]>
Date: Friday, September 3, 2004 7:40 pm
Subject: [ISOGEOCHEM] Re-heating of Cr Reactors (H/Device)

> Hallo,
> due to some technical problems here we have a number of Cr filled
> reactors where the Chromium is not entirely used. We had to switch of
> the H/Device after e.g. 100 samples and cool it down.
> Has anybody experience with re-heating these reactors in the
> H/Device to use the rest of Chromium? I do not expect any problems
> but I have not tried it yet.
>
> greetings,
> Robert
>
> --
> Dr. Robert van Geldern
> Leibniz Institute for Applied Geosciences (GGA)
> S3: Geochronology and Isotopehydrology
> Stilleweg 2, 30655 Hannover, Germany
> phone: +49-(0)511-643-2313 (office), -2539 (lab)
> fax: +49-(0)511-643-3665
> [log in to unmask]
>