Dear M Pier de Groot and all interested persons

As supplier and manufacturer of elemental microanalysis consumable, we are trying to help you
 
 'Ascarite' is a registered name from US Company Thomas Scientific and is NaOH absorbed on Asbestos. Due to Asbestos disease danger, we have now NaOH absorbed on silica based granular form. Results are equivalent. More over we have colour change now that indicate reagent consumption. As the reaction between CO2 and NaOH release H2O, it is absolutely necessary to trap water after. The most common is to add Magnesium Perchlorate after Carbosorb. It is also recommended to trap water from sample or generated by combustion also on Magnesium Perchlorate before, because this water will be condensed on CO2 trap and you will get all chance to block up your trap.

Best regards/ Sincères salutations
Laurent Bertal
Manager

e.mail: [log in to unmask]
http://perso.wanadoo.fr/courtage.analyses.services
Tel: + 33 2 35 07 60 00
fax: + 33 2 35 70 64 39

 

-----Original Message-----
From:   pier de groot [SMTP:[log in to unmask]]
Sent:   Monday, October 26, 1998 12:31 PM
To:     [log in to unmask]
Subject:        Ascarite trap?

Dear listsubscribers,

I was reading an old paper:
Grosse A.V.., Hindin, S.G. and Kirshenbaum, A.D. (1949). Elementary
isotopic analysis. Determination of oxygen, carbon, and nitrogen in
organic compounds. Anal. Chem., 21: 386-390.
In this manuscript a trap in their system is called: Ascarite trap.
This is used to remove carbon dioxide and water from N2 gas for
nitrogen analysis. Can anybody tell me what an ascarite trap exactly
is? In the manuscript by Grosse et al. few is said about this device,
except the name, the contents formed by a 'suitable drying agent', and
its function.

Thanks in advance to all explanations/reactions.

Best wishes,
Pier de Groot.
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Dr. P.A. de Groot
University of the Witwatersrand
Economic Geology Research Unit
Department of Geology
Private Bag 3
2050 Johannesburg
South Africa
Tel.    +27 11 7162564
Fax.    +27 11 3391697
E-mail  <[log in to unmask]>

Visit the combined HOME-PAGE of EGRU-Geology on the Internet:
         http://www.wits.ac.za/science/geology/index.htm
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