Pentane

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Up to 1966

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Predates implementation of GLP and development of standard guidelines but otherwise acceptable for assessment

Guideline:

other: Unknown if guideline was used for this study

Principles of method if other than guideline:

n-Pentane at one atmosphere was added to a glass equilibraton bottle filled with distilled water by displacing water until the volume of the aqueous phase was 3/4 of the volume of the bottle. The gas was maintained over the water. A rubber balloon in the line from the gas cylinder to the bottle served as a resevoir and was remained in-line until the aqueous phase was sampled. The 3/4 full bottle was shaken for 5 to 10 minutes and then allowed to stand at least 30 minutes prior to analysis. Aqueous samples were taken using a Hamilton syringe and transferred to the gas chromatograph (GC).

Analysis was by gas chromatograph (GC) with a hydrogen-flame ionization detecter (Beckman). The chromatographic column was 12 ft. x 0.25 in., stainless steel tubing packed with 25% SE 30 gum rubber on 30-60 mesh firebrick. Helium flow through the column was 65cc/min.

Aqueous samples were taken from the equilibration bottle through a septum in tubing at the base of the bottle using a Hamilton syringe and transferred to the GC. Aqueous phase concentrations of propylene were determined against a standard curve prepared from the gas sample used in the aqueous equilibration procedure

GLP compliance:

no

Remarks:

No data reported

Type of method:

other: Non-standard method

Key result

Water solubility:

38.5 mg/L

Temp.:

20 °C

pH:

7

Remarks on result:

other: pH not stated, therefore assumed standard

Details on results:

No further details provided

Conclusions:

Interpretation of results: slightly soluble (0.1-100 mg/L)
This study is well documented and meets basic scientific principles. It is unclear what effect the impurities might have had on the result and how the authors accounted for them in determining the solubility value. For this reason the study has been classified as reliable with restrictions. Solubility of n-pentane was reported as 38.5 mg/l at 20°C

Executive summary:

This study measured the solubilities of 65 hydrocarbons in water, at room temperature, by the direct injection of hydrocarbon-saturated water into a gas chromatograph. The concentration of hydrocarbon was determined by measuring the area under the chromatogram peak. The solubility of n-pentane was determined to be 38.5 mg/l at 20°C.

Description of key information

The water solubility of Pentane is reported to be 38.5 mg/L.

Additional information

The information available is based on standard guidelines and peer reviewed handbook data, both considered reliable for assessment.