In their 1993 Chem. Geol. (Isot. Geosci. Sect.) paper,
Venneman and O'Neil described a technique for extracting
water from rocks and minerals for D/H measurement. They
state that Zn from the Indiana Biogeochemistry labs and
AnalaR grade Zn shot were used with equal success and "no
significant difference" were observed in H2O yields or D/H
ratios. I was wondering if anyone else had experience of using
AnalaR grade Zn shot for this particular form of water reduction
and if they had enjoyed similar success. If so, can anyone
provide me with the name of a supplier of AnalaR grade materials
in the Southwest United States?

On a related topic, do any list members have experience of storing
pure water in quartz glass for extended periods i.e. > 18 months,
and what effect this may have on water abundances and D/H ratios?

All the best,

Colin.

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       Colin Macpherson
	Geosciences Research Division
	 Scripps Institution of Oceanography
	  University of California at San Diego
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