I know, replying to my own post.  No class at all :)

> In order to get good oxygen data, you'll need to (1) get the reaction
> temperature controlled.  [The AP system has a very nice hot block which
can
> take 120+ tubes at 70 degrees and automatically overflush with helium AND
> dump in the acid]  (2)  Make your phosphoric acid up to an SG of about
1.93
> by adding P2O5 on a hot plate.  This is tricky, and pretty dangerous, so
if
> you want a technique for it, I can email it to you.  Just ask nicely,
'cause
> I've got to type it from paper copy :-)

After getting inundated with request (sic), I typed up the technique we use
for >1.92 SG H3PO4.  I've dumped it onto a web server for anyone who wants
it:  http://pc-23.surrc.gla.ac.uk/Phosph.rtf

I've used good ol' RTF, 'cause (a) it can't contain viruses, and (b) you can
use it on any WP without arguing over file formats.

I hope this is of some use to you all,

Any questions, just ask :-)

Andrew