Alkalinity determination by potentiometry: intercalibration using three different methods
Seawater was sampled from different depths in the North Atlantic Ocean (Canary Islands region) and distributed among three different labs for the determination of titration alkalinity. Analysis was performed by potentiometric methods, involving titration in a closed cell, titration in an open cell a...
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Universidad Autónoma de Baja California
2000
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ftdoajarticles:oai:doaj.org/article:37fc5c78c9df42f782916c58525704a0 2024-09-15T18:23:32+00:00 Alkalinity determination by potentiometry: intercalibration using three different methods L Mintrop FF Pérez M González-Dávila JM Santana-Casiano A Körtzinger 2000-03-01T00:00:00Z https://doi.org/10.7773/cm.v26i1.573 https://doaj.org/article/37fc5c78c9df42f782916c58525704a0 EN ES eng spa Universidad Autónoma de Baja California http://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/573 https://doaj.org/toc/0185-3880 https://doaj.org/toc/2395-9053 doi:10.7773/cm.v26i1.573 0185-3880 2395-9053 https://doaj.org/article/37fc5c78c9df42f782916c58525704a0 Ciencias Marinas, Vol 26, Iss 1 (2000) alkalinity potentiometry seawater certified reference material Biology (General) QH301-705.5 article 2000 ftdoajarticles https://doi.org/10.7773/cm.v26i1.573 2024-08-05T17:49:54Z Seawater was sampled from different depths in the North Atlantic Ocean (Canary Islands region) and distributed among three different labs for the determination of titration alkalinity. Analysis was performed by potentiometric methods, involving titration in a closed cell, titration in an open cell and a two end-point acid addition method. The precision, which is the sample reproducibility taken from the mean standard deviation for replicate measurements, was between 0.45 and 0.90 µmol · kg–1 for the individual labs. Accuracy, here taken as the deviation for the values of a lab from the mean of all three, was mostly below 1 µmol · kg–1 and never exceeded 0.1% of the sample value. Mean standard deviation for all labs and all samples was 0.87 µmol · kg–1, once the individual methods were calibrated using certified reference material (CRM). Without CRM calibration, the mean standard deviation would increase to 2.8 µmol · kg–1. The conclusion is that current high precision methods for alkalinity measurements calibrated with CRMs are able to reach similar accuracy as the measurement of total dissolved inorganic carbon by coulometry and therefore allow for the precise determination of the oceanic carbon dioxide system by using the two measured parameters. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Ciencias Marinas 26 1 23 27 |
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English Spanish |
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alkalinity potentiometry seawater certified reference material Biology (General) QH301-705.5 |
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alkalinity potentiometry seawater certified reference material Biology (General) QH301-705.5 L Mintrop FF Pérez M González-Dávila JM Santana-Casiano A Körtzinger Alkalinity determination by potentiometry: intercalibration using three different methods |
topic_facet |
alkalinity potentiometry seawater certified reference material Biology (General) QH301-705.5 |
description |
Seawater was sampled from different depths in the North Atlantic Ocean (Canary Islands region) and distributed among three different labs for the determination of titration alkalinity. Analysis was performed by potentiometric methods, involving titration in a closed cell, titration in an open cell and a two end-point acid addition method. The precision, which is the sample reproducibility taken from the mean standard deviation for replicate measurements, was between 0.45 and 0.90 µmol · kg–1 for the individual labs. Accuracy, here taken as the deviation for the values of a lab from the mean of all three, was mostly below 1 µmol · kg–1 and never exceeded 0.1% of the sample value. Mean standard deviation for all labs and all samples was 0.87 µmol · kg–1, once the individual methods were calibrated using certified reference material (CRM). Without CRM calibration, the mean standard deviation would increase to 2.8 µmol · kg–1. The conclusion is that current high precision methods for alkalinity measurements calibrated with CRMs are able to reach similar accuracy as the measurement of total dissolved inorganic carbon by coulometry and therefore allow for the precise determination of the oceanic carbon dioxide system by using the two measured parameters. |
format |
Article in Journal/Newspaper |
author |
L Mintrop FF Pérez M González-Dávila JM Santana-Casiano A Körtzinger |
author_facet |
L Mintrop FF Pérez M González-Dávila JM Santana-Casiano A Körtzinger |
author_sort |
L Mintrop |
title |
Alkalinity determination by potentiometry: intercalibration using three different methods |
title_short |
Alkalinity determination by potentiometry: intercalibration using three different methods |
title_full |
Alkalinity determination by potentiometry: intercalibration using three different methods |
title_fullStr |
Alkalinity determination by potentiometry: intercalibration using three different methods |
title_full_unstemmed |
Alkalinity determination by potentiometry: intercalibration using three different methods |
title_sort |
alkalinity determination by potentiometry: intercalibration using three different methods |
publisher |
Universidad Autónoma de Baja California |
publishDate |
2000 |
url |
https://doi.org/10.7773/cm.v26i1.573 https://doaj.org/article/37fc5c78c9df42f782916c58525704a0 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Ciencias Marinas, Vol 26, Iss 1 (2000) |
op_relation |
http://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/573 https://doaj.org/toc/0185-3880 https://doaj.org/toc/2395-9053 doi:10.7773/cm.v26i1.573 0185-3880 2395-9053 https://doaj.org/article/37fc5c78c9df42f782916c58525704a0 |
op_doi |
https://doi.org/10.7773/cm.v26i1.573 |
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Ciencias Marinas |
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26 |
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1 |
container_start_page |
23 |
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27 |
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1810463770301956096 |