Journal
MARINE CHEMISTRY
Volume 174, Issue -, Pages 141-146Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.marchem.2015.06.008
Keywords
Alkalinity; Seawater; Spectrophotometry; Indicator; CO2 system; Ocean acidification
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Funding
- Ocean Acidification Program of the National Oceanic and Atmospheric Administration [NA110AR4320199]
- NSF Grant [OCE-1220110]
- Directorate For Geosciences
- Division Of Ocean Sciences [1220110] Funding Source: National Science Foundation
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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 voluble 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 mu mol kg(-1). (C) 2015 Elsevier B.V. All rights reserved.
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