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- W2020038915 abstract "The use of a micellar solution as a means for improving the colorimetric determination of arylamines by diazotization and coupling is studied. Sodium dodecylsulphate (SDS), Triton X-100 (TX-100) and N-cetylpyridinium chloride (NCPC), together with the diazotizable substances aniline and sulphanilic acid and the coupling agents 1-naphthylamine and N-(1-naphthyl)ethylenediamine are used as model compounds. The protonation constants of the dyes follow the order SDS>H2O>TX-100>NCPC. In an SDS micellar solution the coupling rate increases greatly, allowing the rapid formation of the protonated dyes in an acetate buffer. Other advantages are the possibility of analysing very non-polar samples and of using a wider range of diazotizable substances and substrates. A procedure for the determination of 10–100 μg of aniline in an SDS micellar solution is proposed. The procedure is applied to the determination of sulphonamides in pharmaceutical preparations." @default.
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- W2020038915 title "Colorimetric determination of arylamines and sulphonamides by diazotization and coupling in a micellar solution" @default.
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