苯酚含量测定中KI最佳用量的研究

Study on the Optimal Dosage of KI in the Determination of Phenol

采用滴定法,研究了苯酚含量测定中几个因素的影响,确定了6 mol?L?1?HCl加入10 mL,KI的最佳用量为0.8 g、暗置反应时间7.5 min,此时测得的苯酚浓度与标准值结果接近,相对误差 <0.94%。当KI的加入量1.2 g、暗置反应时间为10 min时,KBrO3-KBr的较佳用量可以选择8 mL。

The influence of several factors on the determination of phenol was studied by titration method. The optimum dosage of 6 mol?L?1 HCl is 10 mL, KI is 0.8 g, and the reaction time is 7.5 min. The concentration of phenol is close to the standard value, and the relative error is less than 0.94%. When the dosage of KI is 1.2 g and the dark reaction time is 10 min, the best dosage of KBrO3-KBr can be selected at 8 mL.