An Automated Procedure for Laboratory and Shipboard Spectrophotometric Measurements of Seawater Alkalinity: Continuously Monitored Single-step Acid Additions
Alkalinity, Seawater, Spectrophotometry, Indicator, CO2 system, Ocean acidification
Digital Object Identifier (DOI)
Building on the spectrophotometric procedure of Yao and Byrne (1998), an automated analysis system has been developed for laboratory and shipboard measurements of total alkalinity at a rate of 6 samples per hour. The system is based on single-point hydrochloric acid (HCl) titrations of seawater samples of a known volume with bromocresol purple as an indicator. The titration is continuously monitored using visible spectroscopy to guide the titration rate according to the real-time pH of the samples. Each titration is terminated just below the equivalence point to achieve a precision and accuracy near 1 μmol kg−1.
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Citation / Publisher Attribution
Marine Chemistry, v. 174, p. 141-146
Scholar Commons Citation
Liu, Xuewu; Byrne, Robert H.; Lindemuth, Michael; Easley, Regina; and Mathis, Jeremy T., "An Automated Procedure for Laboratory and Shipboard Spectrophotometric Measurements of Seawater Alkalinity: Continuously Monitored Single-step Acid Additions" (2015). Marine Science Faculty Publications. 1780.