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A kinetic-dual standard additions method for simultaneous determination of interfering binary mixtures is proposed, and the principles discussed. The deviations of the absorbance from additivity in kinetic systems, caused by a synergistic effect between the two catalysts, are effectively compensated with the defined synergistic catalytic coefficient. The hydrogen peroxide-iodide kinetic reaction...
A flow injection analysis (FIA) method is presented for the simultaneous determinations of iron(III)-vanadium(V) and of iron(III)-chromium(VI) using a single spectrophotometric detector. In the presence of 1,10-phenanthroline (phen), iron(III) is easily reduced by vanadium(IV) to iron(II), followed by the formation of a red iron(II)-phen complex (λ max =510 nm), which shows a positive...
Two new methods for the simultaneous determination of acetylsalicylic acid, acetaminophen and caffeine based on total absorbance measurements and their processing by multiple linear regession and partial least-squares regression are proposed. The concentration ranges used to construct the calibration matrix were 4.0-12.0, 2.0-10.0 and 0.9-6.0 μg ml -1 for acetylsalicylic acid, acetaminophen...
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