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用重量滴定法结合电位滴定二阶导数法确定终点,对二级量热标准苯甲酸作纯度测定,结果为99.97％(摩尔质量分数),测定精度达0.015％。
The end point was determined by gravimetric titration combined with the second derivative method of potentiometric titration. The purity of the second-grade caloric acid standard benzoic acid was determined to be 99.97% (molar mass fraction) with a determination accuracy of 0.015%.