对氨基水杨酸钠中的特殊杂质是什么?简述检查此杂质的原理?
(1)特殊杂质为间氨基酚。(2)原理:双向滴定法中国药典利用对氨基水杨酸钠不溶于乙醚,而间氨基酚易溶于乙醚的特性,使二者分离,在乙醚中加入适量水,用盐酸滴定法滴定,以消耗一定量盐酸液来控制限量。
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