FY 2015 An automated procedure for laboratory and shipboard spectrophotometric measurements of seawater alkalinity: Continuously monitored single-step acid additions Liu, X., R.H. Byrne, M. Lindemuth, R. Easley, and J.T. Mathis Mar. Chem., 174, 141–146, doi: 10.1016/j.marchem.2015.06.008 (2015) 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. Feature Publications | Outstanding Scientific Publications Contact Sandra Bigley | Help
