Abstract
The thiochrome method for determination of vitamin B 1 in pharmaceutical preparations has been adapted to a continuous flow system based on the flow-injection principle. The sample volume required for an analysis is about 150 /sml. For routine purposes a concentration range of 3 × 10 -4–6 × 10 -4 mg ml -1 is used. Results obtained with the system agree well with results obtained manually. The consumption of organic phase is 2–3 ml/sample and the sampling rate is 30/h. A sampling rate of 70/h is easily attained if necessary. The relative standard deviation is about 1%.
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