@article{fdi:010096047,
  title = {{M}etrological concepts applied to {T}otal {A}lkalinity measurements in seawater : reference materials, inter-laboratory comparison and uncertainty budget},
  author = {{C}apitaine, {G}. and {A}lliouane, {S}. and {C}ariou, {T}hierry and {F}in, {J}onathan and {F}isicaro, {P}. and {W}agener, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}otal alkalinity ({TA}) measurements in seawater are crucial for characterizing and monitoring the oceanic carbonate system. {W}hile international best practices and guidelines exist, the field still lacks widely available traceable reference materials and a well-established uncertainty budget of the measurement method. {I}n this study, we applied key metrological principles - development of reference materials, inter-laboratory comparison and uncertainty quantification - to {TA} measurements. {W}e developed two reference materials, including an artificial material with a rigorously characterized reference value and an associated uncertainty budget, being traceable to the {I}nternational {S}ystem of units ({SI}). {T}hese materials were tested in an inter-laboratory comparison involving five laboratories and demonstrated the applicability of the reference materials developed for quality control. {A}dditionally, we established an uncertainty budget for the {TA} measurement method using two metrological approaches. {T}he resulting expanded uncertainty was 5 mu mol kg-1 (with a coverage factor k=2) in {TA}, approaching the 4 mu mol kg-1 target set by the {G}lobal {O}cean {A}cidification {O}bserving {N}etwork for climate monitoring. {T}hese findings mark a significant step toward improving the quality and comparability of {TA} measurements, thereby strengthening long-term ocean carbonate system monitoring.},
  keywords = {},
  booktitle = {},
  journal = {{O}cean {S}cience},
  volume = {22},
  numero = {1},
  pages = {75--99},
  ISSN = {1812-0784},
  year = {2026},
  DOI = {10.5194/os-22-75-2026},
  URL = {https://www.documentation.ird.fr/hor/fdi:010096047},
}