Mathematics – Logic
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.3117m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 14, pp.3117-3121
Mathematics
Logic
13
Scientific paper
Investigation of stable chlorine isotopes in geological materials has been hindered by large sample requirements and/or lack of analytical precision. Here we describe precise methods for the extraction, isolation, and isotopic analysis of low levels of chlorine in both silicate and aerosol samples. Our standard procedure uses 2 g of Cl for each isotopic analysis. External reproducibility (1 ) is 0.25%. for the 37 Cl / 35 Cl measurements. Chlorine is extracted from silicate samples (typically containing at least 20 g of Cl) via pyrohydrolysis using induction heating and water vapor as the carrier, and the volatilized chlorine is condensed in aqueous solution. Atmospheric aerosols collected on filters are simply dissolved in water. Prior to isotopic measurement, removal of high levels of SO 4 2- , F - , and organic compounds is necessary for the production of stable ion beams. Sulfate is removed by BaSCO 4 precipitation, F - by CaF 2 precipitation, and organic compounds are extracted with activated carbon. Chlorine is converted to stoichiometric CsCl by cation exchange, and isotopic ratios are determined by thermal ionization mass spectrometry of Cs 2 Cl + . We demonstrate that the sensitivity and precision of this method allow resolution of natural variations in chlorine isotopic composition, and thereby provide insight to some fundamental aspects of chlorine geochemistry.
Magenheim Andrew J.
Ransom Barbara
Spivack Arthur J.
Volpe Christina
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