Name Source Material Adopted value of δ18O [‰] Ref.
NBS18 IAEA Calcite 7.15 15
IAEA-601 IAEA Benzoic acid 24.14 15
IAEA-602 IAEA Benzoic acid 71.28 15
NBS28 IAEA Quartz 9.58 16
SWy-1 Clay Mineral Society Montmorillonite 18.6 4
Qz Kojundo Chemical Laboratory Co., Ltd. Quartz - -
TKN-01 Kunimain Co., Ltd. Montmorillonite - -
TKN-29 Kunimain Co., Ltd. Montmorillonite - -
TKN-31 Kunimain Co., Ltd. Montmorillonite - -