Minimization of sample requirement for dO in benzoic acid
نویسنده
چکیده
The measurement of the oxygen stable isotope content in organic compounds has applications in many fields, ranging from paleoclimate reconstruction to forensics. Conventional High-Temperature Conversion (HTC) techniques require >20mg of O for a single dOmeasurement. Here we describe a system that converts the CO produced by HTC into CO2 via reduction within a Ni-furnace. This CO2 is then concentrated cryogenically, and ’focused’ into the isotope ratio mass spectrometry (IRMS) source using a low-flow He carrier gas (6–8mL/min). We report analyses of benzoic acid (C7H6O2) reference materials that yielded precise dO measurement down to 1.3mg of O, suggesting that our system could be used to decrease sample requirement for dO by more than an order of magnitude. Copyright # 2010 John Wiley & Sons, Ltd.
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