Salinity determinations by refractometry and oscillation-type densimetry as compatible methods: from salinity to pH

Absolute salinity determination by oscillation-type densimetry and refractometry

“…On the other hand, among the experimental techniques that enable a quantitative analysis of aqueous solutions, densimetry and refractometry have shown to be reliable and easy to use for sodium chloride aqueous solutions. For instance, the metrological compatibility of their measurement results for sodium chloride aqueous solutions, with mass fraction, X m (NaCl), ranging from 7 cg g À1 to 24 cg g À1 (corresponding to the 70 g kg À1 to 240 g kg À1 salinity interval), had already been demonstrated [4][5][6][7][8]. Indeed, the assignment of metrological compatibility to the measurement results, as defined in the International Vocabulary of Metrology À VIM [9], enables to decide whether the measurement results refer to the same measurand, when obtained by different measuring mehods, which would then be commutable.…”