Item talk:Q234337
From geokb
{
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"name": "A new isotopic reference material for stable hydrogen and oxygen isotope-ratio measurements of water\u2014USGS50 Lake Kyoga Water",
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"abstract": "Rationale\nAs a result of the need for isotopic reference waters having high\u00a0\u03b42HVSMOW-SLAP\u00a0and\u00a0\u03b418OVSMOW-SLAP\u00a0values for daily use, especially for tropical and equatorial-zone freshwaters, a new secondary isotopic reference material for international distribution was prepared from water collected from Lake Kyoga, Uganda.\nMethods\nThis isotopic reference lakewater was filtered through a membrane with 0.2-\u00b5m pore size, homogenized, loaded into glass ampoules that were sealed with a torch and autoclaved to eliminate biological activity, and measured by dual-inlet isotope-ratio mass spectrometry. This reference material is available in a case of 144 glass ampoules each containing 5\u00a0mL of water.\nResults\nThe\u00a0\u03b42H and\u00a0\u03b418O values of this reference material are +32.8\u2009\u00b1\u20090.4 and +4.95\u2009\u00b1\u20090.02 mUr (milliurey\u2009=\u20090.001\u2009=\u20091 \u2030), respectively, relative to VSMOW, on scales normalized such that the\u00a0\u03b42H and\u00a0\u03b418O\u00a0values of SLAP reference water are, respectively, \u2212428 and \u221255.5 mUr. Each uncertainty is an estimated expanded uncertainty (U\u2009=\u20092uc) about the reference value that provides an interval that has about a 95 % probability of encompassing the true value.\nConclusions\nThis isotopic reference material, designated as USGS50, is intended as one of two reference waters for daily normalization of stable hydrogen and oxygen isotopic analysis of water with an isotope-ratio mass spectrometer or a laser absorption spectrometer, of use especially for isotope-hydrology laboratories analyzing freshwater samples from equatorial and tropical regions.",
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