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Consistency of practical salinity measurement traced to primary conductivity standards: EUROMET project 918.

Spitzer, P*; Seitz, S*; Brown, R J C (2008) Consistency of practical salinity measurement traced to primary conductivity standards: EUROMET project 918. Accred. Qual. Assur., 13 (10). pp. 601-605.

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Abstract

Measurements of practical salinity are based on conductivity measurements, which are traceable to the conductivity of a defined KCl reference solution. The conductivity of this reference solution must be traceable to the SI in order to state a reliable uncertainty for practical salinity measurements and to guarantee their comparability. Currently, the conductivity ratios from various old standard seawater batches are compared instead. However this method is inadequate on a long time-scale, which is important for oceanography studies, because it lacks a time-invariant reference. Therefore the equivalence of conductivity measurements traceable to primary conductivity standards has been investigated in Euromet project 918. Several European metrology institutes measured the conductivity of a 5 S/m KCl solution and the practical salinity of IAPSO standard seawater. The study estimates relative standard uncertainties to be of the order of 10-4 to 10-3 for such measurements.

Item Type: Article
Subjects: Analytical Science
Analytical Science > Trace Analysis and Electrochemistry
Last Modified: 23 Jul 2018 13:16
URI: http://eprintspublications.npl.co.uk/id/eprint/4213

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