Bergamini, Marcio F.dos Santos, Daniela P.Zanoni, Maria Valnice Boldrin [UNESP]2014-05-202014-05-202007-05-21Sensors and Actuators B-chemical. Lausanne: Elsevier B.V. Sa, v. 123, n. 2, p. 902-908, 2007.0925-4005http://hdl.handle.net/11449/37847Screen-printed carbon electrode (SPCE) modified with poly-L-histidine film can be successfully applied for chromium(VI) determination based on its pre-concentration. Optimum adherence and stability of the POIY-L-histidine film was obtained by direct addition of PH solution 1% (w/v) on the electrode surface, followed by heating at 80 degrees C during 5 min. Linear response range, sensitivity and limit of detection were 0. 1-150 [mu mol L-1, 4. 13 LA mu mol L` and 0.046 mu mol L-1. The repeatability of the proposed sensor, evaluated in terms of relative standard deviation, was measured as 3.2% for 10 experiments in 40 mu mol L-1 using the same electrode and 4.0% using screen-printed electrode as disposable sensor, respectively. The voltammetric sensor was applied to determination of Cr(VI) and indirect determination of Cr(III) in wastewater samples previously treated by a leather dyeing industry and the average recovery for these samples was around 97%. (C) 2006 Elsevier B.V. All rights reserved.902-908engchromium(VI)stripping analysisscreen-printed modified electrodepoly-L-histidineArtigo10.1016/j.snb.2006.10.062WOS:000247060100037Acesso restrito0000-0002-2296-1393