Purity Determination of Benzene and Dioxane by the Method of Thermal Analysis. Comparison of its Results with those determined by the Gas Chromatography and Mass Spectroscopy
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概要
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In the quantitative analysis of an organic compound by physical methods such as mass spectroscopy and infrared spectroscopy, standard samples are generally used, but their purity can not be determined by such methods. For this purpose, the method of thermal analysis is effective. Quantitative analysis of impurity is also possible without standard sample by means of the gas chromatography, when it is detectable. The author measured the purities of purified benzene and dioxane by means of the thermal analysis and compared the results obtained with those from gas chromatography. The apparatus of the thermal analysis was based on Rossini's method. A simplified apparatus was constructed to obtain necessary precision. The freezing point of pure dioxane was found to be 12.01±0.023°by this method. Main impurity in benzene used, separated by gas chromatography, was proved to beC<SUB>7</SUB>H<SUB>16</SUB> by mass spectroscopy.
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