Ocean Science
Ocean Science
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Articles | Volume 16, issue 2
Articles | Volume 16, issue 2
https://doi.org/10.5194/os-16-535-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-16-535-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 16, issue 2
Research article
 | 
27 Apr 2020
Research article |  | 27 Apr 2020

Impact of impurities in bromocresol green indicator dye on spectrophotometric total alkalinity measurements

Katharina Seelmann, Martha Gledhill, Steffen Aßmann, and Arne Körtzinger

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Latest update: 28 Oct 2025
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Short summary
We investigated the impact of indicator dye impurities on spectrophotometric seawater measurements, especially how they may influence the drift behavior and the measurement quality of an autonomous analyzer using this indicator. These measurements are important for ocean carbon observations. This work revealed that impurities up to a quantity of 2 % do not influence the measurement drift and quality. Higher impurity levels lead to a changing drift behavior and quality deteriorations.
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