非水滴定法测定乙氧基喹含量的研究

Research on the Determination of Ethoxyquin Content by Non-aqueous Titration

研究了用高氯酸标准溶液对乙氧基喹含量的非水滴定 ,具体方法为 :精确称乙氧基喹0 2 g ,加 5 0mL冰乙酸、1mL乙酸酐、加 2滴结晶紫指示剂 ,用高氯酸标准溶液滴定至溶液由蓝紫色变为绿色。电位滴定法与指示剂法的测定结果一致 ,极差 0 34%。此方法容易操作 ,滴定终点清晰 ,准确可靠 ,重复性好。

Determination of ethoxyquin content by non aqueous titration with perchloric acid was carried out in mixed solvent of glacial acetic acid (50mL) and acetic anhydride (1mL) with crystal violet as indicator .The result was in agreement with that of potentiometric titration. The maximum error is 0 34%. This method provides easy operation and clear titration endpoint ,and is accurate,reliable and with good repeatability .