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本文对中国药典（1990版）盐酸地尔硫控释片的含量测定方法进行了考察和改进，改进后的方法准确、精密，其平均回收率为100．3％，RSD为0．18％（n＝5）；重现性实验CV％为0．22％（n＝7）。
In this paper, the method of determination of diltiazem hydrochloride controlled release tablets in Chinese Pharmacopoeia (1990 edition) was investigated and improved. The improved method was accurate and precise with the average recovery of 100.3% and RSD of 0.18% n = 5); reproducibility experiment CV% was 0.22% (n = 7).