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IAPSO Standard Seawater: definition of the uncertainty in the calibration procedure, and stability of recent batches

IAPSO Standard Seawater: definition of the uncertainty in the calibration procedure, and stability of recent batches
IAPSO Standard Seawater: definition of the uncertainty in the calibration procedure, and stability of recent batches
Standard seawater (SSW) has been employed by oceanographers as a reference material in the determination
of salinity for over a century. In all that time, this is the first study to determine the uncertainty
of the SSW manufacturing process. SSW is calibrated in reference to carefully prepared solutions of
potassium chloride (KCl). All uncertainties in the preparation and measurement of KCl solutions and of
new SSW are calculated. The expanded uncertainty of the SSW conductivity ratio is found to be 1 105,
based on a coverage factor of 2, at the time of manufacture. There is no discernible “within batch”
variability. No significant variability of quality within or between batches of KCl is found. Measurement of
SSW “offsets” from the label conductivity ratio as long as 5 yr after the SSW batch manufacture are
reported, and no significant change in label conductivity ratio for SSW batches P130 through P144 outside
the expanded uncertainty of 1 105 is found. This last result is in contrast to some other studies, and
herein are suggestions as to why this may be the case.
0739-0572
1785-1799
Bacon, S.
1e7aa6e3-4fb4-4230-8ba7-90837304a9a7
Culkin, F.
402e61c2-a6ae-4a6f-91a6-cb4151c4f213
Higgs, N.
d21a28d3-7990-4d50-b212-cee6ed025496
Ridout, P.
2d1f4e4b-d985-45e2-b54f-cf3169db8c69
Bacon, S.
1e7aa6e3-4fb4-4230-8ba7-90837304a9a7
Culkin, F.
402e61c2-a6ae-4a6f-91a6-cb4151c4f213
Higgs, N.
d21a28d3-7990-4d50-b212-cee6ed025496
Ridout, P.
2d1f4e4b-d985-45e2-b54f-cf3169db8c69

Bacon, S., Culkin, F., Higgs, N. and Ridout, P. (2007) IAPSO Standard Seawater: definition of the uncertainty in the calibration procedure, and stability of recent batches. Journal of Atmospheric and Oceanic Technology, 24 (10), 1785-1799. (doi:10.1175/JTECH2081.1).

Record type: Article

Abstract

Standard seawater (SSW) has been employed by oceanographers as a reference material in the determination
of salinity for over a century. In all that time, this is the first study to determine the uncertainty
of the SSW manufacturing process. SSW is calibrated in reference to carefully prepared solutions of
potassium chloride (KCl). All uncertainties in the preparation and measurement of KCl solutions and of
new SSW are calculated. The expanded uncertainty of the SSW conductivity ratio is found to be 1 105,
based on a coverage factor of 2, at the time of manufacture. There is no discernible “within batch”
variability. No significant variability of quality within or between batches of KCl is found. Measurement of
SSW “offsets” from the label conductivity ratio as long as 5 yr after the SSW batch manufacture are
reported, and no significant change in label conductivity ratio for SSW batches P130 through P144 outside
the expanded uncertainty of 1 105 is found. This last result is in contrast to some other studies, and
herein are suggestions as to why this may be the case.

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Published date: October 2007

Identifiers

Local EPrints ID: 49294
URI: https://eprints.soton.ac.uk/id/eprint/49294
ISSN: 0739-0572
PURE UUID: 55db3a1c-4e71-45e0-be2b-af14bd0c6ff0

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Date deposited: 26 Oct 2007
Last modified: 18 Jul 2019 12:17

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Contributors

Author: S. Bacon
Author: F. Culkin
Author: N. Higgs
Author: P. Ridout

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