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以菲咯啉铁（Ⅲ）为显色剂，测定了双氯灭痛片剂中双氯灭痛的含量．其平均回收率为１００．２２％，相对标准偏差为０．８０％．
The content of diclofenac in diclofenac tablets was determined by using phenanthroline iron (Ⅲ) as chromogenic reagent. The average recovery was 100.22% with a relative standard deviation of 0.80%.