GSD-1G and MPI-DING Reference Glasses for In Situ and Bulk Isotopic Determination

Abstract

This paper contains the results of an extensive isotopic study of United States Geological Survey GSD‐1G and MPI‐DING reference glasses. Thirteen different laboratories were involved using high‐precision bulk (TIMS, MC‐ICP‐MS) and microanalytical (LA‐MC‐ICP‐MS, LA‐ICP‐MS) techniques. Detailed studies were performed to demonstrate the large‐scale and small‐scale homogeneity of the reference glasses. Together with previously published isotopic data from ten other laboratories, preliminary reference and information values as well as their uncertainties at the 95% confidence level were determined for H, O, Li, B, Si, Ca, Sr, Nd, Hf, Pb, Th and U isotopes using the recommendations of the International Association of Geoanalysts for certification of reference materials. Our results indicate that GSD‐1G and the MPI‐DING glasses are suitable reference materials for microanalytical and bulk analytical purposes.

Microanalysis of Pb isotope ratios of low-Pb glass samples by femtosecond laser ablation-multiple ion counter-ICP-mass spectrometry (fsLA-MIC-ICP-MS)

“…Therefore, duplicate analyses were done by BCR-2G basalt and NIST SRM 612 synthetic (rhyolitic) glass standards with different matrices for KL2-G basalt, ATHO-G rhyolite, and GOR132-G komatiite to test various combinations of materials and matrix between the standard and sample. (Jochum et al, 2011) with reproducibility of 0.33-1.0% (2SD), except for KL2-G, which yielded an accuracy of 0.7-1% and reproducibility of 1-1.3% (Table S3 and Fig. 7).…”

“…15, 2013;Jochum et al, 2005aJochum et al, , 2006 except for GSD-1G, which was doped with selected rare earth elements and transition metals including Pb (48 ppm, Guillong et al, 2005). These reference glasses have been well characterized for Pb isotopes (Elburg et al, 2005;Jochum et al, 2005bJochum et al, , 2011Paul et al, 2005) and therefore, were suitable for validating the analytical method. The selected USGS glasses were all basaltic in composition, whereas the MPI-DING glasses covered a wide range of compositions: basalt (KL2-G), andesite (StHs6/80-G), rhyolite (ATHO-G), quartz-diorite (T1-G), and komatiite (GOR132-G).…”

Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

“…These are well-characterised in terms of their chemical composition and their Si isotope ratios. Reference values were used as reported in previous publications [12,[24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Where such reports were lacking, reference Si isotope ratios were determined for this study by conventional solution MC-ICP-ICP analyses.…”

“…Grain mounts of NBS-28 quartz crystals were used directly as measurement standard for bracketing in most of the Si isotope analyses by laser ablation, unless stated otherwise. The MPI-DING glasses KL2-G, ML3B, ATHO-G are of basaltic, andesitic and rhyolitic composition, respectively [24]. NIST SRM 612 and 610 glasses are commonly used as a reference material for calibration in concentration measurements by laser ablation ICP-MS [40].…”

“…60 µg Si (in 1.8 ml) was loaded onto chromatography columns (Spectrum 104704 PP filled with 1.5 ml AG50W-X8) and Si was eluted with 5 ml H2O. The Si solution was acidified to 0.1M HCl and Mg (Alfa Aesar Specpure 14430; evaporated, and dissolved in 0.1M HCl) was added to both samples and to the bracketing NBS-28 as an internal standard, to be able to use the 25 Mg/ 24 Mg ratio for mass bias drift correction between the two bracketing measurements of NBS-28; the latter being prepared by the same decomposition and Si purification procedure as the samples. Quantitative sample recovery (measured column yield >98%, i.e.…”