IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Pyrene with Sodium chloride and Water
Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Pyrene; C16H10; [129-00-0]  NIST Chemistry WebBook for detail
   (3) Sodium chloride; NaCl; [7647-14-5]  NIST Chemistry WebBook for detail
Original Measurements:
   Schwarz, F.P., J. Chem. Eng. Data. 1977, 22, 273-7.

 Variables:
   Temperature = 8.6 °C - 31.1 °C   
pH = Salinity: 30 g(2)/kg sln
   Concentration = Salinity: 30 g(2)/kg sln

 Prepared By:
   W.Y. Shiu, D. Mackay

 Experimental Remarks:
   The corresponding mass percent and mole fraction, x1, at 25.0°C calculated by the compilers are 9.48 × 10–6 g(1)/100 g sln and 7.97 × 10-9.

 Experimental Data:   (Notes on the Nomenclature)
  
Solubility of pyrene in 0.5 g-mol(2)/dm**3
t/°C107 * n1/V2 [mol/L]
8.62.00
12.22.50
15.52.85
18.23.22
20.73.57
23.03.90
25.04.41
28.15.19
31.15.96
 Method/Apparatus/Procedure:
   The solubility of pyrene in NaCl solution was determined by fluorescence and UV absorption measurements. In the fluorescence method, saturated solution was prepared by adding excess amount of pyrene to an air-tight 1 × 1 cm quartz fluorescence cell containing 5 mL salt solution. The cell was rotated at 20 rpm for at least 72 hr in a thermostated water bath and then its fluorescent intensity was measured at 395 nm. The Spectrofluorimeter employed a ratio-photon counting mode where pyrene concentration was linearly related to the fluorescence signal. The UV method was used to obtain the absorptivity of pyrene in ethanol therefore provide an absolute solubility scale for the fluorescence method.

 Source and Purity of Materials:
   (1) Pyrene: purity > 99 mole %;
   (2) Sodium chloride: reagent grade;
   (3) Ethanol: reagent grade; Water: distilled over a KMnO4 - NaOH solution and passed through a Sephadex column.

 Estimated Errors:
   Solubility: ± 1.6% (author)
   Temperature: ± 0.1 °C (author)