Abstract
A continuous precipitation and filtration flow system coupled on-line with an atomic absorption spectrometer for the determination of local anaesthetics (lidocaine, tetracaine, procaine) at the μg ml −1 level is described. The precipitate is formed by injecting cobalt into a carrier containing the sample and is subsequently retained on a stainless-steel filter. By such precipitation, these drugs can be determined in the range 1.0–11×10 −5 M, with a relative standard deviation of 0.6% at a sampling frequency of 100 h −1. The method is applied to the determination of local anaesthetics in pharmaceutical preparations.
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