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All issues Volume 13 (2022) Int. J. Metrol. Qual. Eng., 13 (2022) 10 Full HTML
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Table 1

Uncertainty budget of the absolute salinity results, S A, obtained via density, S A(ρ), and refractive index, S A(n), measurements at 20 °C.

Contribution Measurement Standard uncertainty Method of evaluation Distribution Degrees of freedom
Instrument resolution Density Refractive index kg m−3
Type B Rectangular 50
Instrument calibration (including drift) Density
Refractive index		 10−2 kg m−3
10−5 		Type B Normal 50
Measurement repeatability Density
Refractive index		 Type A Normal N-1
Temperature1 Density
Refractive index		 – Type A Normal 50
Interpolation (from ref. values2,3) Density
Refractive index		 6 10−3 kg m−3
2 10−2 		Type B Rectangular 50

Legend: σ − standard deviation of the N measurement values, following the 2.4 section; 1–the temperature uncertainty component is already taken into account in the uncertainty of the calibration of the measuring instrument; 2–according to [15], with a Uρ = (1 10−4)/(12)1/2 and UXmNaCl =(1 10−1)/(12)1/2 uncertainties; 3–according to [16], with a Un = (1 10−4)/(12)1/2 and UXm NaCl = (1 10−1)/(12)1/2 uncertainties.

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