Journal
MARINE CHEMISTRY
Volume 80, Issue 2-3, Pages 185-197Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0304-4203(02)00133-0
Keywords
chemical analysis; analytical techniques; alkalinity; titration
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This paper describes a method used to certify reference materials based on seawater for total alkalinity. The technique employs a two-stage, potentiometric, open-cell titration using coulometrically analyzed hydrochloric acid. The equivalence point is evaluated from titration points in the pH region 3.0-3.5 using a least-squares procedure that corrects for the reactions with sulfate and fluoride ions. The reproducibility (one standard deviation) of this technique is less than 1 mumol kg(-1); the accuracy is within 2 mumol kg(-1). (C) 2002 Elsevier Science B.V. All rights reserved.
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