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*

Hi Ritchie,

Back in the 1970s at the University of Washington we used a method  
similar to that described by Eric Essene -Ir strip, etc. It worked  
well, but we found that it was smart to do more than one bead per  
sample. Multiple beads from a single sample helped identify cases in  
which, despite strenuous efforts to mix and homogenize samples,  
homogenization wasn't complete.

Bill
>
>
>
> *
>
> Hi
>
> Is anyone out there using a metal strip or graphite method to fuse  
> small (maybe 100mg or
> so) amounts of rock powder without flux into a glassy bead which can  
> then be mounted,
> cut, and polished for EPMA or LA-ICP-MS analysis?
>
> I'm hoping to convert my (t)rusty old Edwards 306 vacuum coater into  
> such a device but
> I'm trying to avoid reinventing too many wheels.
>
> I remember seeing such a method setup at UC Davis about ten years  
> ago but I haven't
> had any luck following that one up.
>
> We actually want to use LA-ICP-MS so it seems to us that a graphite  
> boat setup would be
> better from a contamination viewpoint than a metal strip.
>
> Any references, tips, experiences etc would be most welcome.
>
> cheers
> Ritchie Sims
> Geology
> Auckland University
> NZ
>
>
> ********************************************************************
> Michael M. Cheatham
> 312 Heroy Geology Laboratory                Phone (315)-443-1261
> Syracuse University                         Fax   (315)-443-3363
> Syracuse, NY 13244-1070
>
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>