在自行组装带微型计算机的流动注射分析仪上,以721型分光光度计为检测器,利用FeCl_3与左旋多巴的显色反应进行定量,建立了流动注射分析测定左旋多巴片中左旋多巴含量的新方法。最佳显色反应条件为0.0032mol/L FeCl_3-0.03mol/L HCl,检测波长728nm,左旋多巴线性范围50～1600μg/ml,检测限10μg/ml,进样频率100样次/h,方法简便、快速、可靠,回收率达97.88％～103.4％,相对标准偏差<3.2％。 A flow injection analyzer equipped with a microcomputer was used to quantify the color reaction of FeCl_3 and levodopa with a 721 spectrophotometer as a detector. Flow injection analysis was used to determine the levodopa New method of content. The best color reaction conditions were 0.0032mol / L FeCl_3-0.03mol / L HCl, the detection wavelength was 728nm, the linear range of levodopa was 50 ~ 1600μg / ml, the detection limit was 10μg / ml, the injection frequency was 100 samples / h, Simple, rapid and reliable, the recovery rate was 97.88% ~ 103.4% with relative standard deviation <3.2%.