IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Toluene with Water
Components:

Original Measurements:
   Rossi, S.S.; Thomas, W.H., Environ. Sci. Technol. 1981, 15, 715-6.

 Variables:
   Temperature = One temperature: 25 °C

 Prepared By:
   G.T. Hefter

 Experimental Remarks:
   The solubility of toluene in distilled water at 25°C was reported to be 506.7 μg/g, corresponding to a mole fraction, x1, of 5.5 x 10-6. The corresponding mass per cent calculated by the compiler is 0.0507 g(1)/100 g sln.

 Experimental Data:   (Notes on the Nomenclature)
   Method/Apparatus/Procedure:
   500 mL of water and an excess of (1) were equilibrated for at least 24 h in a 1 L Erlenmeyer flask placed in a constant temperature (± 0.1°C) gyrotary shaker (200 rpm). After a 12 h stationary equilibration period, 100 mL of saturated solution was drained through a glass-wool plug into a calibrated separatory funnel. Toluene was extracted (>99%) by passing known volumes through 0.6 x 6 cm columns of a superficially porous bonded C18 stationary-phase adsorbant and eluted with trichlorofluoromethane. Toluene levels in eluates were determined on a Hewlett-Packard Model 5840A gas chromatograph equipped with a flame ionisation detector and an electronic integrator using a 1/8 in x 8 ft stainless-steel column of 10% TCEP on 10/120 Chromsorb or a WCOTSP-2100 glass column (0.25 mm x 30 m). Hydrocarbon concentrations in eluates were additionally determined by UC spectrophotometry.

 Source and Purity of Materials:
   (1) Burdick & Jackson; purified by triple distillation in glass.
   (2) Double distilled in all-glass apparatus; free of trace organics.

 Estimated Errors:
   Solubility: ± 6.1 microg/g (std. dev. for 6 determinations)
   Temperature: ± 0.1°C