Seawater density measurements in the temperature range between 278.15 K and 308.15 K at ambient pressure

摘要

Seawater density has a great importance in the oceanographic science, since it can be used for salinity determination, if density is known with the necessary accuracy. For that reason, a review of the methods for density measurements suitable for seawater measurements is presented. Furthermore, in this work standard seawater density is measured at different practical salinities (from 9.997 to 37.999) in the temperature range between (278.15 to 308.15) K at ambient pressure. Measurements are carried out by means of a vibrating tube densimeter and following the substitution method (alternating samples of seawater and ordinary water). Besides, an accurate analysis of the density uncertainty has been performed, obtaining an expanded uncertainty of 0.004%. Measurements are carried out and compared with density results given in the literature, performed with the same technique.