Abstract：As a certified reference material, uncertainty is an important quality reference index of China primary standard seawater. The method of IAPSO SSW's uncertainty definition and GB/T 15000.3 "Directives for the work of reference materials(3)—Reference materials—General and statistical principles for certification" were considered as references. Fixed value uncertainty, homogeneity uncertainty, long-term stability uncertainty were analysed one by one. Take the data of batch P1 as an example, the conductivity uncertainty of the three above components are 5.00×10-6, 5.05×10-6 and 4.50×10-6. The combined standard uncertainty and expanded uncertainty are 8.42×10-6 and 1.7×10-5. According the law of uncertainty propagation, obtained the expanded uncertainty of salinity is 6.6×10-4 (or 0.001) .
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2020, Vol. 41 
