A method to measure the density of seawater accurately to the level of 10(-6)

作者：Schmidt Hannes; Wolf Henning^*; Hassel Egon

来源：Metrologia, 2016, 53(2): 770-786.

DOI：10.1088/0026-1394/53/2/770

• seawater
• high precision density measurement
• substitution method
• vibrating tube densimeter
• high pressure adjustment

A substitution method to measure seawater density relative to pure water density using vibrating tube densimeters was realized and validated. Standard uncertainties of 1 g m(-3) at atmospheric pressure, 10 g m(-3) up to 10 MPa, and 20 g m(-3) to 65 MPa in the temperature range of 5 degrees C to 35 degrees C and for salt contents up to 35 g kg(-1) were achieved. The realization was validated by comparison measurements with a hydrostatic weighing apparatus for atmospheric pressure. For high pressures, literature values of seawater compressibility were compared with substitution measurements of the realized apparatus.

• 出版日期2016-4