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In this work was developed a multicommuted flow system for determination of sodium diclofenac, acetylsalicylic acid and fluoride ions in ampoules, tablets and tap waters, respectively. For sodium diclofenac the method used was based on its reaction with potassium permanganate (20 80 mg L 1 ). For acetylsali yli a id the ethod used as ased o Tri der s rea tio after alkali e hydrolysis of the analyte (25 100 mg L -1 ). For fluoride ions the method used was the well-known SPADNS (0.4 1.6 mg L -1 ). Results were compared with their respective reference methods and, by applying the paired t-test, no statistic difference between them was verified at the 95% confidence level. After optimization of the variables of the analytical system, it was able to analyze 80, 72 and 68 sample h 1 containing sodium diclofenac, acetylsalicylic acid and fluoride, respectively with reduced waste generation according to basic principles of green chemistry.

Versatility of a Multicommuted Flow System in the Spectrometric Determination of Three Analytes