USGS46 Greenland Ice Core Water – A New Isotopic Reference Material for δ 2 H and δ 18 O Measurements of Water

• Published in: Geostandards and Geoanalytical Research
• Main Authors: Coplen, Tyler B., Qi, Haiping, Tarbox, Lauren, Lorenz, Jennifer, Buck, Bryan
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2013
• Subjects: Greenland; Greenland ice core; ice core
• Online Access: http://dx.doi.org/10.1111/j.1751-908x.2013.00267.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1751-908X.2013.00267.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1751-908X.2013.00267.x

Ice core from Greenland was melted, filtered, homogenised, loaded into glass ampoules, sealed, autoclaved to eliminate biological activity, and calibrated by dual‐inlet isotope‐ratio mass spectrometry. This isotopic reference material ( RM ), USGS46, is intended as one of two secondary isotopic reference waters for daily normalisation of stable hydrogen (δ 2 H) and stable oxygen (δ 18 O) isotopic analysis of water with a mass spectrometer or a laser absorption spectrometer. The measured δ 2 H and δ 18 O values of this reference water were −235.8 ± 0.7‰ and −29.80 ± 0.03‰, respectively, relative to VSMOW on scales normalised such that the δ 2 H and δ 18 O values of SLAP reference water are, respectively, −428 and −55.5‰. Each uncertainty is an estimated expanded uncertainty ( U = 2 u c ) about the reference value that provides an interval that has about a 95‐percent probability of encompassing the true value. This reference water is available in cases containing 144 glass ampoules that are filled with either 4 ml or 5 ml of water per ampoule.