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Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography
Published on: May 16, 2014
Determination of iodate in waters by cuvetteless UV-vis micro-spectrophotometry after liquid-phase microextraction
Francisco Pena-Pereira1, Sonia Senra-Ferreiro, Isela Lavilla
1Departamento de Química Analítica y Alimentaria, Area de Química Analítica, Facultad de Química, Universidad de Vigo, Campus As Lagoas-Marcosende s/n, 36310 Vigo, Spain.
Abstract:
The combination of liquid-phase microextraction and microvolume UV-vis spectrophotometry has been applied to the determination of iodate in natural water samples. The method is based on the reduction of iodate into vapor iodine and extraction of this volatile onto a single drop of N,N'-dimethylformamide. The following derivatization reaction was employed: Optimum conditions employed for iodate determination were as follows: 2.5 microL N,N'-dimethylformamide exposed to the headspace of a 10 mL acidic (HCl 0.2 mol L(-1)) aqueous solution stirred at 1400 rpm for 7 min after addition of 1 mL of KI 10(-3)mol L(-1) for in situ iodine generation. The limit of detection was determined as 1.1 microg L(-1). The repeatability, expressed as relative standard deviation, was 4.2% (n=6). A large preconcentration factor (i.e. 396) was obtained in only 7 min.
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