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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Autónoma de Baja California
2000
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=48026102 |
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Sommario:
- 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