一 概述 在对二甲苯低温氧化制造对苯二甲酸的氧化反应母液中,存在对甲醛苯甲酸(PFBA)。其含量一般都采用直流极谱法测定。由于样品组成复杂,且被测组分是有机物,用极谱法测定时,干扰因素多,重现性差。此外,极谱分析使用水银,其蒸汽的毒性又大,有损操作人员的健康。采用气相色谱法代替极谱法,效果良好。 An overview of p-xylene oxidation of terephthalic acid oxidation of the mother liquor, the presence of p-formaldehyde benzoic acid (PFBA). Its content is generally determined by direct current polarography. Due to the complex composition of the sample, and the measured components are organic compounds, the determination by polarography, the interference factors, poor reproducibility. In addition, polarographic analysis uses mercury, which is highly toxic to steam and impairs the health of operators. Gas chromatography instead of polarography, the effect is good.