SDS Volume (956)
Volume 38. Hydrocarbons in Water and Seawater, Part II, p None
Original Measurements
Schwarz, F. P.; J. Chem. Eng. Data. 1977, 22, 273-7.
Variables:
Room Temp:
8.6 - 31.1
°C
Salinity:
30 g(2)/kg sln
Prepared by:
Method/Apparatus/Procedure:
The solubility of pyrene in $\ce{NaCl}$ 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 x 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:
- Pyrene: purity > 99 mole%;
- Sodium chloride: reagent grade;
- Ethanol: reagent grade; Water: distilled over a $\ce{KMnO4}$ - $\ce{NaOH}$ solution and passed through a Sephadex column.
Estimated Errors:
Ambient temperature: ±0.1°C (author)
Mass concentration (m/v) (1): ±1.6% (author)
Components:
- Pyrene, $\ce{ C16H10 }$; [129-00-0] NIST WebBook
- Sodium chloride, $\ce{ NaCl }$; [7647-14-5] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
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.
Solubility of pyrene in 0.5 g-mol(2)/dm**3
| $T$ (°C) | $C_{1}$ (mol/L) |
|---|---|
| 8.6 | 2.00 x 10-7 |
| 12.2 | 2.50 x 10-7 |
| 15.5 | 2.85 x 10-7 |
| 18.2 | 3.22 x 10-7 |
| 20.7 | 3.57 x 10-7 |
| 23.0 | 3.90 x 10-7 |
| 25.0 | 4.41 x 10-7 |
| 28.1 | 5.19 x 10-7 |
| 31.1 | 5.96 x 10-7 |
