Packaging and storage—
Preserve in tight containers, remote from fire.
Identification—
The IR absorption spectrum of a thin film of it between potassium bromide plates exhibits a strong band at about 5.8 µm; a strong region of absorption between 6.8 and 7.5 µm, with maxima at about 7.0 and 7.3 µm; a strong maximum at about 8.2 µm; and weak maxima at about 9.2 and 11.0 µm.
Water—
Standard preparation—
Transfer 0.50 mL of water to a dry 100-mL volumetric flask, dilute with dehydrated isopropyl alcohol to volume, and mix.
Chromatographic system—
Under typical conditions, the gas chromatograph is equipped with a thermal conductivity detector, and contains a 1.5-m × 6-mm stainless steel column containing packing S4. The column is maintained at a temperature of 180
, and helium is used as the carrier gas.
Procedure—
Inject 5.0 µL of Standard preparation into a suitable gas chromatograph, and determine the area under the water peak. Similarly inject 5.0 µL of the same dehydrated isopropyl alcohol to provide a blank, and determine the area under the water peak. The retention time is about 1 minute. Similarly inject 5.0 µL of Acetone. The area under the water peak for Acetone is not greater than that from the Standard preparation corrected for the area under the water peak in the blank chromatogram (0.5%).
Nonvolatile residue—
Evaporate 50 mL in a tared porcelain dish on a steam bath, and dry at 105
for 1 hour: the weight of the residue does not exceed 2 mg (0.004%).
Readily oxidizable substances—
Mix 20 mL with 0.10 mL of 0.10 N potassium permanganate in a glass-stoppered bottle: the permanganate color of the mixture does not completely disappear within 15 minutes.
Assay—
Chromatographic system—
Under typical conditions, the instrument is equipped with a flame-ionization detector, and contains a 3-mm × 1.8-m column containing packing S4. The column temperature is programmed at a rate of about 8
per minute from 110
to 220
, and helium is used as the carrier gas.
Procedure—
Inject a suitable volume, typically about 0.5 µL, of Acetone into a suitable gas chromatograph, and record the chromatogram. Calculate the percentage of C3H6O in the Acetone, on the anhydrous basis, by dividing the area under the acetone peak by the sum of the areas under all of the peaks and multiplying by 100. [NOTE—No separate correction is applied for water content, since water does not respond to the flame-ionization detector.]
;)
841
:
not more than 0.789.