Dear all

We have been running D/H for the first time in several years using a 5 year
old  batch of Indiana zinc that has been stored in an evacuated flask.   H
conversion yields seem fine but D/H ratios correlate with sample size (20
permil shift from 0.5 to 5 microlitres). All the obvious remedies have now
been tried and I am forced into suspecting the zinc. Does anyone had a
similar experienc using old zinc?  Can/should it be pretreated/regenerated
in any way after languishing for so long?

Thanks and best wishes

Dave

Dave Mattey

Geology Dept, Royal Holloway College, University of London, Egham Hill,
Egham, Surrey, TW20 0EX

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