Use the searchable table below find the reference material you require. The table can be filtered by δ values, the lowest value must be entered first. The reference materials available for purchase directly from Sercon can be found at, links are provided within the table.

All values are reported with respect to the international scales: δ13CVPBD, δ2HVSMOW, δ15NAIR, δ18OVSMOW, δ34SVCDT unless otherwise stated.

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*values are also available with reference to OVPBD, please see certificate of analysis for more information