MARINE METROLOGY

CRM (Standard Sea Water)[ DATE : OCT 31, 2014 ]

        Standard Seawater is reference material of salinity, made of natural seawater, with accurate salinity value. Approved by AQSIQ, NCOSM can produce China Primary Standard Seawater (approved in 2004) and China Serial Standard Seawater (approved in 1989).Through completely reproduced the PSS-78, we established the national primary standard of seawater salinity.

       China Primary Standard Seawater is national primary certified reference material (CRM) (GBW 13150), and it has a salinity value of 35 (U=0.001). According to PSS-78, it can trace to KCl standard solution directly, and can be certificated accurately, equivalent to the international level.China Serial Standard Seawater is national secondary CRM [GBW(E) 130011], and it consists of five kind of standard seawater with different salinity value (5, 20, 30, 35, 40 respectively, U=0.003), and can trace to China Primary Standard Seawater.