Dear Phillip:

The W-85 zeolite has been out of supply for years. I tried many
substitutions without success. The nitrogen recovery was less than 50%. I
will also appreciate it if someone could provide me with more information on
w-85.

Regards.

Dachun Zhang
Global Geochemistry Corp.


-----Original Message-----
From: Phillip Ford <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Thursday, September 17, 1998 4:27 AM
Subject: Sources of Zeolite W-85 ??


>Dear Colleagues,
>        I am trying to track down a source of  Zeolite W-85 formerly
manufactured
>by Union Carbide. It is used as a method for scavenging ammonia from
>aqueous solutions for determination of nitrogen isotopic ratio at natural
>abundance  See:Velinsky, D. J., et al Mar. Chem. 26, 351-361 ( 1989).I
>should be grateful for advice of suppliers, or of alternative techniques of
>comparable effectiveness and efficiency.
> thanks for your help.
> Phillip Ford
>
>Dr Phillip W. FORD
>CSIRO Division of Land and Water
>GPO Box 1666,
> Canberra, ACT 2601,
> Australia
>tel +61 ( 02 ) 6246 5559
>fax. + 61 ( 02 ) 6246 5560.
>
>*****************************************
>