Hi All... Quick question, Im interested in analyzing d15N values of bulk mussel shell organics and I was wondering if anyone knew of a "quick and dirty" way to prep shells for the EA... I would like to avoid hydrofloric acid if at all possible; Im not too worried about de- salting after hydrolysis... Im also curious to know what the average weight percent of organics one might expect to extract out of mussel shells? Any suggestions? Wombat Boy Seth Newsome, Ph.D. Carnegie Institution of Washington Geophysical Laboratory 5251 Broad Branch Road NW Washington, DC 20015 [log in to unmask] (202) 478-8987