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采用双波长分光光度法同时测定氯霉素盐酸麻黄碱滴鼻剂中氯霉素和盐酸麻黄碱的含量，氯霉素和盐酸麻黄碱的测定波长分别为２７６ｎｍ 和２５６ｎｍ ，平均回收率分别为９９－８５ ％ 、ＲＳＤ＝ ０ ．６５２ ％ 和１００－３ ％ 、ＲＳＤ＝ ０ ．２８ ％ 。
Simultaneous determination of chloramphenicol and ephedrine hydrochloride in chloramphenicol hydrochloride ephedrine nasal drops by dual-wavelength spectrophotometry. The determination wavelength of chloramphenicol and ephedrine hydrochloride were 276nm and 256nm, respectively. The average recoveries were 99 -85%, RSD = 0. 652% and 100-3%, RSD = 0. 28%.