wˌɛɹ ðə stˈændɚd hɐz ɐ nˈoʊn ˌaɪsətˈɑːpɪk kˌɑːmpəzˈɪʃən, sˈʌtʃ ɐz vɪˈɛnə stˈændɚd mˈiːn ˈoʊʃən wˈɔːɾɚ vˈiːsmˈoʊ.
where the standard has a known isotopic composition, such as Vienna Standard Mean Ocean Water (VSMOW).