Components:
(1) Pyrene,
C16H10; [129-00-0]
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.
- Regent grade
- Distilled from potassium permanganate-sodium hydroxide and passed through an XAD-2 column.
Estimated Errors:
Ambient temperature: ±0.05°C
Mass concentration (m/v) (1): Ks ±0.003; So ±0.001
Experimental Values:
Note: The solubility of pyrene 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)
evaluating the equation for S over the range of Cs 0-0.7 mol/L, Ks = 0.286 with So = 0.132.
The corresponding mass percent and mole fraction x1, at salinity = 35 g(2)/kg sln calculated by the compilers are 8.60 × 10-6 g(1)/100 g sln and 7.84 × 10-9.
