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A comparison is made of the use of riboflavin and 3-cyclohexylaminopropanesulphonic acid (CAPS) to increase the sensitivity of the determination of sulphite in a flow injection procedure based on the chemiluminescence produced by permanganate oxidation in an acidic solution. Both procedures give linear calibration graphs for 5-60 ng of sulphite, but the CAPS procedure has a lower detection limit (1.2 ng) and better relative standard deviation (RSD) (2.5% for 40 ng, n = 10). Riboflavin enhancement arises from energy transfer, but the reason for the CAPS enhancement could not be identified with certainty. Keywords : Sulp h ite; ch em ilu m in escence; flow injection ana I ysis; rib0 fla vin ; c yclo hexane derivatives Paper A61259

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An accurate spectrophotometric method is proposed for the determination of paracetamol. Cerium(lV) sulphate is used to oxidise paracetamol in 5 M H2S04 to p-benzoquinone, which is then determined at 410 nm. The method has been successfully applied to the analysis of commercial pharmaceutical preparations and the results have been statistically compared with those obtained by the official (BP) method.