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为消除糖衣及赋形剂的干扰，采用一阶导数分光光度法于２５５．６和２９８ｎｍ处测定氯霉素片。平均回收率和变异系数分别为９９．９４％和０．３９％。
In order to eliminate the interference of sugar coatings and excipients, the first derivative spectrophotometry was used to determine chloramphenicol tablets at 255.6 and 298 nm. The average recovery rate and coefficient of variation were 99.94% and 0.39%, respectively.