Verification of the metrological Reliability of Standard Seawater Calibration
Abstract
The calibration of standard seawater, the most relevant standard for worldwide Practical Salinity measurements, is based on a conductance ratio measurement of standard seawater and a defined KCl solution. The results of an interlaboratory comparison measurement of such conductance ratios are presented at various salinities (7, 19, 35) and temperatures (5, 15, 25, 35 °C). The comparison reveals a dependence of the conductance ratios on the measurement systems that is larger than the uncertainty currently assigned to Practical Salinity measurements. This jeopardizes long term continuity of Practical Salinity measurements, if the type of instrument currently used for standard seawater calibration should not be available one day. There is a need for a metrological network for oceanographic observables to put Practical Salinity measurements on a sustainable metrological ground.
Event details
- Event
- 1st IMEKO TC19 Workshop on Metrology for the Sea
- Technical Committee
- TC19
- info@metrosea.org
- Place
- Naples, ITALY
- Time
- 11 October 2017 - 13 October 2017
- Website
- http://www.metrosea.org