TITLE:
Development of a Portable, OCaPI, for the Measurement of pH and pCO2 in the Seawater: A Key Issue for Monitoring Acidification in the Mediterranean
AUTHORS:
Samba Alarba Barry, Adama Moussa Sakho, Cellou Kanté, Véronique Guglielmi, Anne-Cécile Ribou, Alhassane Diami Diallo
KEYWORDS:
Acidification, Mediterranean, Carbonate System, Seawater, OCaPI
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.14 No.5,
May
9,
2026
ABSTRACT: This development highlights the significant advantages of the portable instrument (UV-Vis spectrophotometer OCaPI) for the analysis of two parameters of the oceanic carbonate system. This method is characterized by its appreciable precision, its modest construction and operating costs, as well as its minimal ecological footprint due to the use of small sample volumes. The optimization of the spectrophotometer parameters (integration time, average scan, Boxcar) facilitated the precise study of the parameters of the oceanic carbonate system and contributed to monitoring ocean acidification. This instrument is a compact, space-saving device that is easy to transport at sea. Its ease of use and maintenance, combined with its optimal performance appreciated in the field, make it a preferred choice. This facility allows the global scientific community to monitor ocean acidification regularly and widely.