Abstract
It is needed on the process control of the vinyl acetate production that small amounts of benzene and toluene in vinyl acetate are determined. The author has compared a number of instrumental analyses with eath other, and concluded that the ultraviolet spectrometry is the most fitted for the purpose.
Absorption spectrum through a 10 mm layer of sample solution (properly diluted by methanol) is conveniently used, and with the estimation of light absorbancy at 260.2 mμ and 268.2 mμ, 0.01 to 0.5% of benzene and toluene can be determined simultaneously with an accuracy of ±10%-relative at 95% reliability.
The limit of detection is 0.005%, but 0.001 to 0.002% when benzene or toluene is contained separately.
