This method is handled by first measuring area of each impurity peak and total area of chromatographic peak on the chromatograph chart exceeding solvent peak, then calculate percentage of each peak area and their sum to total peak area.

• 方法是测量各杂质峰的面积和色谱图上除溶剂峰以外的总色谱峰面积，计算各峰面积及其之和占总峰面积的百分率。