Alkalinity determination by potentiometry: intercalibration using three different methods
16 pages, 1 figure, 3 tables. [EN] 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 close...
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2000
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ftcsic:oai:digital.csic.es:10261/25136 2024-02-11T10:06:47+01:00 Alkalinity determination by potentiometry: intercalibration using three different methods Determinación potenciométrica de la alcalinidad: Intercalibración usando tres métodos diferentes Mintrop, L. Pérez, Fiz F. González-Dávila, Melchor Santana-Casiano, Magdalena Körtzinger, Arne 2000 146001 bytes application/pdf http://hdl.handle.net/10261/25136 es en spa eng Universidad Autónoma de Baja California http://www.cienciasmarinas.com/index.php/cmarinas/article/view/573 Ciencias Marinas 26(1): 23-37 (2000) 0185-3880 http://hdl.handle.net/10261/25136 open Alkalinity Potentiometry Seawater Certified reference materials Alcalinidad Potenciometría Agua de mar Material certificado de referencia artículo http://purl.org/coar/resource_type/c_6501 2000 ftcsic 2024-01-16T09:27:13Z 16 pages, 1 figure, 3 tables. [EN] 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 k(-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. [ES] Se determinó la alcalinidad de muestras de agua de mar recogidas a diferentes profundidades en el Océano Atlántico Norte y distribuidas entre tres laboratorios, utilizando tres variantes potenciométricas: valoración en cubeta cerrada, valoración en cubeta abierta y un método de adición a doble punto final. La precisión, la reproducibilidad de la muestra obtenida a partir de la desviación estándar media para medidas replicadas, fue entre 0.45 y 0.90 µmol . kg(-1) para cada laboratorio. La exactitud, tomada como la desviación de los valores de un laboratorio respecto de la media de los tres, fue mayoritariamente menor que 1 µmol . kg(-1) y nunca excedió 0.1% del valor de la muestra. La desviación media estándar para todos los ... Article in Journal/Newspaper North Atlantic Digital.CSIC (Spanish National Research Council) Doble ENVELOPE(-62.550,-62.550,-64.667,-64.667) Referencia |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
Spanish English |
topic |
Alkalinity Potentiometry Seawater Certified reference materials Alcalinidad Potenciometría Agua de mar Material certificado de referencia |
spellingShingle |
Alkalinity Potentiometry Seawater Certified reference materials Alcalinidad Potenciometría Agua de mar Material certificado de referencia Mintrop, L. Pérez, Fiz F. González-Dávila, Melchor Santana-Casiano, Magdalena Körtzinger, Arne Alkalinity determination by potentiometry: intercalibration using three different methods |
topic_facet |
Alkalinity Potentiometry Seawater Certified reference materials Alcalinidad Potenciometría Agua de mar Material certificado de referencia |
description |
16 pages, 1 figure, 3 tables. [EN] 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 k(-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. [ES] Se determinó la alcalinidad de muestras de agua de mar recogidas a diferentes profundidades en el Océano Atlántico Norte y distribuidas entre tres laboratorios, utilizando tres variantes potenciométricas: valoración en cubeta cerrada, valoración en cubeta abierta y un método de adición a doble punto final. La precisión, la reproducibilidad de la muestra obtenida a partir de la desviación estándar media para medidas replicadas, fue entre 0.45 y 0.90 µmol . kg(-1) para cada laboratorio. La exactitud, tomada como la desviación de los valores de un laboratorio respecto de la media de los tres, fue mayoritariamente menor que 1 µmol . kg(-1) y nunca excedió 0.1% del valor de la muestra. La desviación media estándar para todos los ... |
format |
Article in Journal/Newspaper |
author |
Mintrop, L. Pérez, Fiz F. González-Dávila, Melchor Santana-Casiano, Magdalena Körtzinger, Arne |
author_facet |
Mintrop, L. Pérez, Fiz F. González-Dávila, Melchor Santana-Casiano, Magdalena Körtzinger, Arne |
author_sort |
Mintrop, L. |
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 |
http://hdl.handle.net/10261/25136 |
long_lat |
ENVELOPE(-62.550,-62.550,-64.667,-64.667) |
geographic |
Doble Referencia |
geographic_facet |
Doble Referencia |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://www.cienciasmarinas.com/index.php/cmarinas/article/view/573 Ciencias Marinas 26(1): 23-37 (2000) 0185-3880 http://hdl.handle.net/10261/25136 |
op_rights |
open |
_version_ |
1790604727024615424 |