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采用差示分光光度法测定复方诺氟沙星滴耳液中甲硝唑的含量，不须分离，该法简便、快速、结果准确。平均回收率为１００．５２％，ＲＳＤ为０．４７％。
The determination of metronidazole in compound norfloxacin ear drops by differential spectrophotometry was simple, rapid and accurate. The average recovery was 100.52% with a RSD of 0.47%.