By James D. Webster Harald Behrens
Publication by way of Harald Behrens, James D. Webster
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Additional resources for Sulfur in Magmas and Melts: its importance for natural and technical processes
2006), determined at the Carnegie Institution of Washington using a CAMECA IMS6F ion probe (SIMS), was assumed for the concentration calculations because the same study also reported sulfur determinations by SIMS for both the NIST SRM 612 (350±35 ppm) and NIST SRM 614 (306±31 ppm) glasses, allowing for direct comparison here. The sulfur results for NIST SRM 612 and 614 by LA-ICP-SFMS are generally similar to those of Jochum et al. (2006) in both low-and medium-resolution modes (Table 3). As expected, measurement of the 34S isotope gives superior results in low resolution.
Microanalytical tools involving the ion probe and LA-ICP-MS offer an additional benefit of potential determination of sulfur isotope ratios (see the contributions in this volume by Marini et al. 2011 and Simon and Ripley 2011). Samples analyzed via mass spectrometry following high-temperature combustion offer a similar benefit, but the extraction of sulfur species dissolved in glass by this method has proven difficult with most EA systems. Analytical Methods 35 ACKNOWLEDGMENTS We would like to thank Nicole Metrich and Charles Mandeville for reviews that improved the presentation of this chapter.
3, uncertainties up to 50% were reported. Paul (2008) measured 5 μg/g sulfur in a 1 g sample of ultra-high-purity iron by the 35S method, with an irradiation time of 8 h. (Paul 2008) and an expanded uncertainty of about 10%, with a 30% correction for the chlorine (also measured by NAA). 1 μg Cl. A general discussion of uncertainties arising in RNAA procedures is given elsewhere (Paul et al. 2003; Paul 2008). Prompt gamma-ray activation analysis (PGAA), also known as prompt neutron gammaray activation analysis (PNGAA), utilizes radiation emitted during neutron bombardment rather than radiation from delayed decay of radioactive product nuclei.