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Hello Ten years back I tried the same, but I found it was not possible to recycle the used Zn shot for further use for the D/H analysis. Perhaps it has to do with the surface of the Zn, as the reaction takes place on the surface of the Zn grains. If you see the surface of the Zn grains before the reaction it is like a fine sponge I have tried to show the clean surface with the help of SEM photographs Ref: Anal. Chem Vol.62 No.19 Oct.1 1990 2158-2160 But after the reaction the recycled Zn surface is smooth all the pours are blocked and inspite of cleaning with nitric acid it remains like a solid block. It looks like we have to live with it. regards Tanweer IAEA Isotope Hydrology Laboratory ---------- From: isogeochem To: isogeochem Subject: Zn shot recycling Date: Tuesday, 19. November 1996 17:23 Dear comrades We have accumulated a lot used Zinc shot in our lab in deuterium isotope analyses. I wonder if it's possible to recycle the used Zn shot for further use in D/H measurement. I tried washing with HNO3 to remove the oxides and vacuum-drying, but it didn't work. Your suggestions, method of treatment or references are all welcome. Thank you for your attention. W. M. Duan <[log in to unmask]> BRITISH GEOLOGICAL SURVEY HYDROGEOLOGY GROUP CROWMARSH GIFFORD WALLINGFORD OXON, OX10 8BB UK