Abstract
A method for entrapment of reagents is described. The experimental procedure is based on the dispersion of the reagent (MnO 2) into an unsaturated polyester solution and grinding the product to give the required particle size (300–400 μm). The reagent is packed into a bed reactor (1.5 mm i.d.) and incorporated in a flow-injection system. The procedure was used for the indirect atomic absorption spectrometric determination of isoniazid (0.5–10 μg ml −1) in solutions of pharmaceutical products, with little interference from excipients. The measurements are based on the determination of Mn 2+ released on oxidation of the isoniazid. The relative standard deviation for the determination of 5 μg ml −1 of isoniazid is 2.57% ( n = 40) and the sample throughput is 43 h −1.
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