Seawater pH Measurements: an At-sea Comparison of Spectrophotometric and Potentiometric Methods
Digital Object Identifier (DOI)
Spectrophotometric procedures utilizing sulfonephthalein indicators provide rapid, quantitative measurements of seawater pH. In a series of shipboard comparison, the average difference between our spectrophotometric and potentiometric pH measurements was 0.012 ± 0.010 + ph (spec., 20°C, free H+ scale) - pH (potent., 25°C, NBS scale). The ±0.010 S.E. obtained in our at-sea comparison suggests that the imprecision associated with either type of measurement was <±0.010. Spectrophotometric procedures involving dissolved sulfonephthalein indicators appear well suited to in situ analysis of both pH and alkalinity.
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Citation / Publisher Attribution
Deep Sea Research Part A. Oceanographic Research Papers, v. 35, issue 8, p. 1405-1410
Scholar Commons Citation
Byrne, R. H.; Robert-Baldo, G.; Thompson, S. W.; and Chen, C. T.A., "Seawater pH Measurements: an At-sea Comparison of Spectrophotometric and Potentiometric Methods" (1988). Marine Science Faculty Publications. 1681.