Fig. 1From: Two-point normalization for reducing inter-laboratory discrepancies in δ17O, δ18O, and Δ′17O of reference silicatesSchematic diagram of BrF5 introduction and water fluorination line modified from Kim et al. (2019). Two microliters of water was introduced into the vacuum line through a septum-inlet using a micro-syringe and then transferred in a Ni reaction tube with BrF5 at liquid nitrogen temperature. The reaction was run at 200 °C for 1 h.Back to article page