科研之友
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摘要
A simple, rapid and high selective method for the assay of captopril has been developed. It is based on the reaction of captopril with Cu2+ and SCN- to form precipitate quantitatively in aqueous solution. The amount of residual Cu2+ can be determined by flow injection on-line filtration-dilution-atomic absorption spectrometry, then the content of captopril can be determined indirectly. The linear range is 2similar to100 mg/L, the recovery is 97.1%similar to99.5%, the sampling frequency is 100/h. The method has been applied to determine captopril with satisfactory result.
