The University of Arizona
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Magnesium perchlorate as an alternative water trap in AMS graphite sample preparation; a report on sample preparation at KCCAMS at the University of California, Irvine.

G M Santos, J R Southon, K C Druffel-Rodriguez, S Griffin, M Mazon

Abstract


We present a brief discussion of sample preparation procedures at the Keck Carbon Cycle Accelerator Mass Spectrometer (KCCAMS), University of California, Irvine, and a systematic investigation of the use of Mg(ClO (sub 4) ) (sub 2) as an absorptive water trap, replacing the standard dry ice/ethanol cold finger in graphite sample preparation. We compare high-precision AMS measurement results from oxalic acid I and USGS coal samples using Mg(ClO (sub 4) ) (sub 2) under different conditions. The results obtained were also compared with those achieved using the conventional water removal technique. Final results demonstrate that the use of Mg(ClO (sub 4) ) (sub 2) as an alternative water trap seems very convenient and reliable, provided the Mg(ClO (sub 4) ) (sub 2) is replaced frequently.

Keywords


absolute age;academic institutions;accelerator mass spectroscopy;C 13 C 12;C 14;California ;carbon ;carbon dioxide;graphite ;Irvine California;isotope ratios;isotopes ;Keck Carbon Cycle Accelerator Mass Spectrometry Laboratory;magnesium perchlorate;mass spectroscopy;measurement ;methods ;native elements;Orange County California;radioactive isotopes;sample preparation;spectroscopy ;stable isotopes;United States;University of California

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