Might it be this one?
J. Renpenning, A. Schimmelmann, M. Gehre, Compound‐specific hydrogen isotope analysis of fluorine‐, chlorine‐, bromine‐and iodine‐bearing organics using gas chromatography–chromium‐based high‐temperature conversion (Cr/HTC) isotope ratio mass spectrometry, Rapid Communications in Mass Spectrometry. 31 (2017) 1095–1102.