一,緒言在炼焦化学生产中,酚类的測定經常使用容量法,卽在双球計量管中,用8%的NaOH飽和食盐水溶液抽提焦油餾份的甲苯稀釋液。此方法,分析时間較长,一个試样約需三小时。由于酚鈉溶液与油之介面生成棕色絮状沉淀0.1—0.2cc,很难确定准确的介面,因而准确度不高,会造成10%左右的誤差。 I. INTRODUCTION In the production of coking chemicals, the volumetric method is often used for the determination of phenols. In a double-ball metering tube, the toluene dilution of the tar fraction is extracted with 8% NaOH saturated saline solution. This method, the analysis time is longer, a sample takes about three hours. As sodium phenolate solution and the oil interface to generate brown flocculent sediment 0.1-0.2cc, it is difficult to determine the exact interface, so accuracy is not high, will result in about 10% error.