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在气相色谱分析中,直接进样分析苯羧酸有一定困难,通常必须将其制备成衍生物。Kaufman认为,这是由于它们在高温下不能完全挥发,易于脱羧或形成酸酐。Tpycoв研究了o-甲基苯甲酸的直接进样分析,发现汽化室温度超过300℃时有峰的拖尾或消失现象,也怀疑是由于脱羧引起。我们的实验结果表明,苯甲酸、苯乙酸、o-、m-、p-甲基苯甲酸、邻苯二甲酸及水杨酸等苯羧酸,汽化室温度即使超过300℃也
In gas chromatographic analysis, direct injection analysis of benzene carboxylic acid has some difficulties, usually it must be prepared as a derivative. Kaufman believes that this is because they can not be completely volatile at high temperatures, easy decarboxylation or anhydride formation. Tpycoв studied the direct injection analysis of o-methylbenzoic acid and found that the tailing or disappearance of peaks at vaporization chamber temperatures above 300 ° C was also suspected due to decarboxylation. Our experimental results show that benzene carboxylic acid such as benzoic acid, phenylacetic acid, o-, m-, p-methylbenzoic acid, phthalic acid and salicylic acid and the like, the vaporization chamber temperature exceeding 300 ° C.