电位滴定法测定大曲酸度的研究

Research on the Determination of Daqu Acidity by Potentiometric Titration Method

大曲酸度是大曲的重要质量指标之一,采用传统指示剂法测定大曲酸度,受到大曲颜色干扰,误差较大。采用电位滴定法测定大曲酸度,通过大量实验数据绘图确定滴定终点pH值。该方法操作简便,提高了测定结果的准确性,用于生产过程大曲样品测定,结果令人满意。

Daqu acidity is one of the important quality indicators. Traditional indicator method to determinate daqu acidity is .easily interfered by Daqu color and may produce large error. However, potentiometric titration to determine daqu acidity, by drawing a large number of experimental data to determine the titration end point pH, is aimple to operate with high accuracy. Its use in practice has achieved satisfactory results.