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

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

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)...

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প্রধান লেখক: Ríos, AF, Pérez, FF
বিন্যাস: Online
ভাষা:eng
প্রকাশিত: Iniversidad Autónoma de Baja California 1999
অনলাইন ব্যবহার করুন:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/656
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spelling oai:cienciasmarinas.com.mx:article-6562019-05-22T17:19:27Z Improvements in potentiometric determinations of the CO2 oceanic system using seawater sub-standards and CO2 reference materials Mejoras en las determinaciones potenciométricas del sistema de CO2 oceánico usando agua de mar subestándar y materiales de referencia de CO2 Ríos, AF Pérez, FF pH alkalinity potentiometry seawater carbon dioxide pH alcalinidad potenciometría agua de mar dióxido de carbono 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. 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. Iniversidad Autónoma de Baja California 1999-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/656 10.7773/cm.v25i1.656 Ciencias Marinas; Vol. 25 No. 1 (1999); 31-49 Ciencias Marinas; Vol. 25 Núm. 1 (1999); 31-49 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/656/586
institution Ciencias Marinas
collection OJS
language eng
format Online
author Ríos, AF
Pérez, FF
spellingShingle Ríos, AF
Pérez, FF
Improvements in potentiometric determinations of the CO2 oceanic system using seawater sub-standards and CO2 reference materials
author_facet Ríos, AF
Pérez, FF
author_sort Ríos, AF
title Improvements in potentiometric determinations of the CO2 oceanic system using seawater sub-standards and CO2 reference materials
title_short Improvements in potentiometric determinations of the CO2 oceanic system using seawater sub-standards and CO2 reference materials
title_full Improvements in potentiometric determinations of the CO2 oceanic system using seawater sub-standards and CO2 reference materials
title_fullStr Improvements in potentiometric determinations of the CO2 oceanic system using seawater sub-standards and CO2 reference materials
title_full_unstemmed Improvements in potentiometric determinations of the CO2 oceanic system using seawater sub-standards and CO2 reference materials
title_sort improvements in potentiometric determinations of the co2 oceanic system using seawater sub-standards and co2 reference materials
description 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.
publisher Iniversidad Autónoma de Baja California
publishDate 1999
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/656
_version_ 1715723994831781888

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