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Sample Analysis. The samples were analyzed using a
Hewlett-Packard (6890) gas chromatograph (GC) equipped
with series connected thermal conductivity and flame
ionization detectors so that water and the other components
could be detected in the same run. The GC column
was a 25 m  0.25 mm bonded phase fused silica capillary
column. Helium, 99.999% pure, was used as carrier gas.
The injector and detectors were at 503.15 K and 533.15 K,
respectively. The oven was operated at programmed temperature,
from 353 K to 493 K at a rate of 40 K min-1.
1,2-Propanediol was used as internal standard for analysis
of the quaternary samples. The estimated uncertainty in
phase compositions was (0.0005 mole fraction. Quantitative
analysis of monomeric lactic acid in the vapor phase
was also carried out by titration with sodium hydroxide,
using phenolphthalein as the indicator. This method is only
accurate for very weak lactic acid solutions.12
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