Components:
(1) Naphthalene,
C10H8; [91-20-3]
NIST WebBook
(2) Sodium chloride,
NaCl; [7647-14-5]
NIST WebBook
(3) Water,
H2O; [7732-18-5]
NIST WebBook
Original Measurements
May, W. E.; Wasik, S. P.; Freeman, D. H.; Anal. Chem. 1978, 50, 997-1000
Variables:
Ambient temperature: 25 °C
Salinity: 0 - 40 g(2)/kg sln
Prepared by:
Method/Apparatus/Procedure:
A saturated solution of (1) was prepared by pumping salt water through a 'generation column' which was packed with glass beads coated with 1% by weight of (1). The saturated solution was extracted with an 'extractor column' packed with a superficially porous bonded C18 stationary phase, then a water-acetonitrile solvent was passed through for extraction. The extract was introduced into a liquid chromatograph and the concentration of (1) was measured with a UV detector.
Source and Purity of Materials:
- greater than 97% pure
- reagent grade.
- distilled from potassium permanganate-sodium hydroxide and passed thrugh an XAD-2 column.
Estimated Errors:
Ambient temperature: ±0.05°C
Mass concentration (m/v) (1): Ks ±0.001; So ±0.23
Experimental Values:
Note: The solubility of naphthalene in aqueous sodium chloride is reported in terms of the Setschenow equation:log(So/S) = KsCs
where:
So is the solubility of (1) in water (mg/L)
S is the solubility of (1) in saline solution (mg/L)
Ks is the Setschenow constant (L/mol)
Cs in the concentration of sodium chloride (mol/L)
evaluatiing the equation for S over the range of Cs 0-0.7 mol/L, Ks = 0.213 with So = 31.69.
The corresponding mass percent and mole fraction x1, at salinity = 35 g(2)/kg sln calculated by the compilers are 2.29 × 10-3 g(1)/100 g sln and 3.29 × 10-6.
