Hi Jennifer,

As best I know the new coils have slightly smaller
beads inside and the silver balls you can see are just
to help keep them inside the coil.
If you carefully stretch one of the new coils you
should see the beads inside.

A good rinse in DI water and overnight in a 60'C oven
should help. As will extending the equilibration to 3
hrs and using Labco instead of Wheaton vials (up the
water sample to 400ul).

Cheers

Nick..

--- Jennifer McKay <[log in to unmask]> wrote:

> Hello Everyone,
>
> I have two batches of Hokko Beads.  The old ones,
> that have been
> sitting around in a drawer for 4 years,  are white
> in colour.  The
> new ones, that were shipped with our Aquaprep, are
> metallic and
> silver coloured.  The white ones did not work well
> the first time,
> but results appear to be improving with each use.
> Results are fine
> when I use the silver ones.  I assume that some sort
> of oxide coating
> has formed on the old beads.  Has anyone seen this
> and can you
> suggest how I might fix the problem?
>
> Yours truly,
> Jennifer
>
>
>
------------------------------------------------------
> Jennifer Mckay
> Agente de Recherche / Research Associate
> GEOTOP - Universite du Quebec a Montreal
> C.P. 8888, succursale Centre-Ville
> Montreal, Quebec, Canada
> H3C 3P8
>
> Telephone bureau/office: 514-987-3000 (poste/ext
> 2413)
> Telephone lab: 514-987-3000 (poste/ext 7028)
> Telephone GEOTOP: 514-987-4080
> Telecopieur/Fax: 514-987-3635
> E-mail: [log in to unmask] or if that fails try
> [log in to unmask]
>
------------------------------------------------------
>


Nick Collins
Stable Isotope Lab Manager
University of Maryland.

Tel: +1(240) 601-5107
Fax +1(301) 294-6236





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