Alkalinity determination by potentiometry: intercalibration using three different methods
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Redalyc · Ciencias Marinas
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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| Publié dans: | Ciencias Marinas |
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Autónoma de Baja California
2000
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| _version_ | 1878325298790924288 |
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| author | Ludger Mintrop |
| author_facet | Ludger Mintrop |
| collection | Ciencias Marinas |
| container_title | Ciencias Marinas |
| contents | Alkalinity determination by potentiometry: intercalibration using three different methods Ludger Mintrop Melchor González Dávila J. Magdalena Santana Casiano Arne Körtzinger Fiz F. Pérez Ciencias de la Tierra seawater alkalinity potentiometry certified reference material Seawater was sampled from different depths in the North Atlantic Ocean (Canary Islands region) anddistributed among three different labs for the determination of titration alkalinity. Analysis wasperformed by potentiometric methods, involving titration in a closed cell, titration in an open cell and atwo end-point acid addition method. The precision, which is the sample reproducibility taken from themean standard deviation for replicate measurements, was between 0.45 and 0.90 µmol ⋅ kg1 for theindividual labs. Accuracy, here taken as the deviation for the values of a lab from the mean of all three,was mostly below 1 µmol ⋅ kg1 and never exceeded 0.1% of the sample value. Mean standard deviationfor all labs and all samples was 0.87 µmol ⋅ kg1, once the individual methods were calibrated using certified reference material (CRM). Without CRM calibration, the mean standard deviation wouldincrease to 2.8 µmol ⋅ kg1. The conclusion is that current high precision methods for alkalinitymeasurements calibrated with CRMs are able to reach similar accuracy as the measurement of totaldissolved inorganic carbon by coulometry and therefore allow for the precise determination of theoceanic carbon dioxide system by using the two measured parameters. 2000 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48026102 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.1 Vol.26 |
| ctrlnum | oai:cienciasmarinas.com.mx:article/573 10.7773/cm.v26i1.573 |
| 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.
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 laboratorios y todas las muestras fue de 0.87 µmol · kg–1, una vez que los métodos individuales se calibraron usando material certificado de referencia (CRM). Sin la calibración con CRM, la desviación estándar media se incrementaría a 2.8 µmol · kg–1. Se concluye que la precisión real de los métodos para la medida de la alcalinidad calibrada con CRM es capaz de alcanzar exactitudes similares a las medidas de carbono inorgánico total por coulometría y por lo tanto permite la determinación precisa del sistema de carbono oceánico usando la medida de las dos variables. |
| format | Artículo científico |
| id | redalyc_48026102 |
| institution | Redalyc Ciencias Marinas |
| language | en |
| publishDate | 2000 |
| publisher | Universidad Autónoma de Baja California |
| spelling | Alkalinity determination by potentiometry: intercalibration using three different methods Determinación potenciométrica de la alcalinidad intercalibración usando tres métodos diferentes Mintrop, L Pérez, FF González-Dávila, M Santana-Casiano, JM Körtzinger, A alkalinity potentiometry seawater certified reference material alcalinidad potenciometría agua de mar material certificado de referencia 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. 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 laboratorios y todas las muestras fue de 0.87 µmol · kg–1, una vez que los métodos individuales se calibraron usando material certificado de referencia (CRM). Sin la calibración con CRM, la desviación estándar media se incrementaría a 2.8 µmol · kg–1. Se concluye que la precisión real de los métodos para la medida de la alcalinidad calibrada con CRM es capaz de alcanzar exactitudes similares a las medidas de carbono inorgánico total por coulometría y por lo tanto permite la determinación precisa del sistema de carbono oceánico usando la medida de las dos variables. Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas 2000-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/573 10.7773/cm.v26i1.573 Ciencias Marinas; Vol. 26 No. 1 (2000); 23-27 Ciencias Marinas; Vol. 26 Núm. 1 (2000); 23-27 2395-9053 0185-3880 eng https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/573/510 ['Redalyc'] redalyc_48026102 Alkalinity determination by potentiometry: intercalibration using three different methods ['Alkalinity determination by potentiometry: intercalibration using three different methods', 'Ludger Mintrop', 'Ciencias de la Tierra', 'seawater', 'alkalinity', 'potentiometry', 'certified reference material', 'Alkalinity determination by potentiometry: intercalibration using three different methods Ludger Mintrop Melchor González Dávila J. Magdalena Santana Casiano Arne Körtzinger Fiz F. Pérez Ciencias de la Tierra seawater alkalinity potentiometry certified reference material Seawater was sampled from different depths in the North Atlantic Ocean (Canary Islands region) anddistributed among three different labs for the determination of titration alkalinity. Analysis wasperformed by potentiometric methods, involving titration in a closed cell, titration in an open cell and atwo end-point acid addition method. The precision, which is the sample reproducibility taken from themean standard deviation for replicate measurements, was between 0.45 and 0.90 µmol ⋅ kg\x961 for theindividual 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\x961 and never exceeded 0.1% of the sample value. Mean standard deviationfor all labs and all samples was 0.87 µmol ⋅ kg\x961, once the individual methods were calibrated using certified reference material (CRM). Without CRM calibration, the mean standard deviation wouldincrease to 2.8 µmol ⋅ kg\x961. The conclusion is that current high precision methods for alkalinitymeasurements calibrated with CRMs are able to reach similar accuracy as the measurement of totaldissolved inorganic carbon by coulometry and therefore allow for the precise determination of theoceanic carbon dioxide system by using the two measured parameters. 2000 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48026102 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.1 Vol.26'] ['Ludger Mintrop'] ['Ludger Mintrop'] ['Artículo científico'] ['2000'] ['Universidad Autónoma de Baja California'] ['en'] ['Ciencias de la Tierra', 'seawater', 'alkalinity', 'potentiometry', 'certified reference material'] ['https://www.redalyc.org/articulo.oa?id=48026102'] ['Alkalinity determination by potentiometry: intercalibration using three different methods Ludger Mintrop Melchor González Dávila J. Magdalena Santana Casiano Arne Körtzinger Fiz F. Pérez Ciencias de la Tierra seawater alkalinity potentiometry certified reference material Seawater was sampled from different depths in the North Atlantic Ocean (Canary Islands region) anddistributed among three different labs for the determination of titration alkalinity. Analysis wasperformed by potentiometric methods, involving titration in a closed cell, titration in an open cell and atwo end-point acid addition method. The precision, which is the sample reproducibility taken from themean standard deviation for replicate measurements, was between 0.45 and 0.90 µmol ⋅ kg\x961 for theindividual 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\x961 and never exceeded 0.1% of the sample value. Mean standard deviationfor all labs and all samples was 0.87 µmol ⋅ kg\x961, once the individual methods were calibrated using certified reference material (CRM). Without CRM calibration, the mean standard deviation wouldincrease to 2.8 µmol ⋅ kg\x961. The conclusion is that current high precision methods for alkalinitymeasurements calibrated with CRMs are able to reach similar accuracy as the measurement of totaldissolved inorganic carbon by coulometry and therefore allow for the precise determination of theoceanic carbon dioxide system by using the two measured parameters. 2000 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48026102 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.1 Vol.26'] |
| spellingShingle | Alkalinity determination by potentiometry: intercalibration using three different methods Ludger Mintrop Ciencias de la Tierra seawater alkalinity potentiometry certified reference material Alkalinity determination by potentiometry: intercalibration using three different methods Ludger Mintrop Melchor González Dávila J. Magdalena Santana Casiano Arne Körtzinger Fiz F. Pérez Ciencias de la Tierra seawater alkalinity potentiometry certified reference material Seawater was sampled from different depths in the North Atlantic Ocean (Canary Islands region) anddistributed among three different labs for the determination of titration alkalinity. Analysis wasperformed by potentiometric methods, involving titration in a closed cell, titration in an open cell and atwo end-point acid addition method. The precision, which is the sample reproducibility taken from themean standard deviation for replicate measurements, was between 0.45 and 0.90 µmol ⋅ kg1 for theindividual labs. Accuracy, here taken as the deviation for the values of a lab from the mean of all three,was mostly below 1 µmol ⋅ kg1 and never exceeded 0.1% of the sample value. Mean standard deviationfor all labs and all samples was 0.87 µmol ⋅ kg1, once the individual methods were calibrated using certified reference material (CRM). Without CRM calibration, the mean standard deviation wouldincrease to 2.8 µmol ⋅ kg1. The conclusion is that current high precision methods for alkalinitymeasurements calibrated with CRMs are able to reach similar accuracy as the measurement of totaldissolved inorganic carbon by coulometry and therefore allow for the precise determination of theoceanic carbon dioxide system by using the two measured parameters. 2000 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48026102 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.1 Vol.26 |
| title | Alkalinity determination by potentiometry: intercalibration using three different methods |
| title_alt | Determinación potenciométrica de la alcalinidad intercalibración usando tres métodos diferentes |
| topic | Ciencias de la Tierra seawater alkalinity potentiometry certified reference material |
| topic_facet | alkalinity potentiometry seawater certified reference material alcalinidad potenciometría agua de mar material certificado de referencia |
| url | https://www.redalyc.org/articulo.oa?id=48026102 https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/573 |