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Improvements in potentiometric determinations of the CO2 oceanic system using seawater sub-standards and CO2 reference materials

Authors: Ríos, Aida F.; Pérez, Fiz F.;

Improvements in potentiometric determinations of the CO2 oceanic system using seawater sub-standards and CO2 reference materials

Abstract

[ES] Durante el crucero Cither 3, a lo largo de la sección WOCE A14, se midieron potenciométricamente pH y alcalinidad, en las 107 estaciones examinadas en toda la columna de agua. Las correcciones llevadas a cabo a los datos brutos permitió mejorar la calidad de los mismos. El procedimiento seguido en la corrección estuvo enfocado en controlar: (i) las calibraciones, (ii) el potencial de unión líquida y (iii) el agua de mar subestándar. El material de referencia de CO2 (CRM) ha sido utilizado para comprobar este procedimiento. La exactitud de las medidas de pH15 (escala NBS) y alcalinidad fue 0.004 y 1.4 μmol.kg–1, respectivamente. El carbono inorgánico total certificado para el CRM, lote 24, es 1987.55 μmol.kg–1. Un valor de 1987.8 ± 2.2 μmol.kg–1 se obtuvo siguiendo el procedimiento de corrección. Esta mejora fue independientemente verificada por medio de covarianzas entre nitrato y pH, y entre silicato y alcalinidad normalizada en Agua Profunda Noratlántica

[EN] During the Cither 3 cruise along WOCE section A14, where 107 full-water column stations were surveyed, pH and alkalinity were measured potentiometrically. Corrections carried out on the raw data set have allowed us to improve the data quality. The correction procedure was focused on monitoring: (i) calibrations, (ii) liquid junction potential and (iii) seawater sub-standards; CO2 reference material (CRM) has been used to check this procedure. Accuracy of pH15 measurements (NBS scale) and alkalinity was 0.004 and 1.4 μmol.kg–1, respectively. Certified total inorganic carbon on CRM, batch 24, is 1987.55 μmol.kg.–1. A value of 1987.8 ± 2.2 μmol.kg–1 was obtained following the correction procedure. This improvement was independently verified by means of the covariances between nitrate and pH, and between silicate and normalized alkalinity in North Atlantic Deep Water.

This work was supported by CICYT (grant number ANT94-1168-E) and IFREMER (University contract number 94-1430-087)

19 páginas, 12 figuras, 1 tabla

Peer reviewed

Keywords

Dióxido de carbono, PH, Alcalinidad, Alkalinity, Potentiometry, Carbon dixide, Seawater, Potenciometría, Agua de mar

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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