Suárez, Carlos A. [UNESP]De Simone, Thays V. [UNESP]Menegário, Amauri A. [UNESP]Rolisola, Ana M.C.M. [UNESP]Luko, Karen S. [UNESP]Gastmans, Didier [UNESP]Da Conceição, Fabiano T. [UNESP]Kiang, Chang H. [UNESP]2018-12-112018-12-112016-07-01Talanta, v. 154, p. 299-303.0039-9140http://hdl.handle.net/11449/172746A method for the in situ redox speciation analysis of chromium in water by the diffusive gradients in thin films (DGT) technique using a DE81 anion exchange membrane was successfully developed. For the selective uptake of Cr(VI), a DGT device containing an anion exchange membrane DE81 (cellulose acetate chromatographic paper) was used (DE81-DGT), while selective uptake of Cr(III) was carried out using DGT devices containing the Chelex-100 resin (Chelex-100-DGT). A correlation coefficient of 0.993 was obtained for the linearity of the immersion curves (mass versus time) using DE81-DGT. The diffusion coefficient values for Cr(VI) through the agarose diffusive layer were equal to 4.89±0.5×10-6 cm2 s-1 and 3.95±0.02×10-6 cm2 s-1 (T=23±1°C, I=0.03 mol L-1 NaNO3) were obtained by using diffusion cell and immersion curves, respectively. The retention of Cr(VI) by the DE81 membrane in a synthetic sample and river water was not affected by the pH over a wide range 4-9). Recoveries of Cr(VI) between 90% and 120% from solutions of ionic strength ranging from 0.01 to 0. 5 mol L-1 NaNO3 were achieved. Finally, the redox speciation analysis of Cr(III) and Cr(VI) in spiked river water and synthetic samples was performed with recoveries greater than 80% and 87% by using Chelex-100-DGT and DE81-DGT devices, respectively. Those results were in excellent agreement with the diphenylcarbazide spectrophotometric method.299-303engChromium speciationDE81 membraneDiffusive gradientsPaper-based DGTPassive samplerThin filmsArtigo10.1016/j.talanta.2016.03.085Acesso aberto2-s2.0-849620531562-s2.0-84962053156.pdf1989662459244838