caa a22 4500 469129816 CHVBK 20180323133201.0 cr unu---uuuuu 170328e19920901xx s 000 0 eng 10.1007/BF00324838 doi (NATIONALLICENCE)springer-10.1007/BF00324838 Voltammetric determination of pentachlorophenol with a silica gel-modified carbon paste electrode [Elektronische Daten] [M. Ruiz Barrio, J. Pingarrón Carrazón] Summary: The anodic voltammetric behaviour of pentachlorophenol at a silica gel-modified carbon paste electrode in aqueous solution is reported. Adsorption of the fungicide onto the electrode under open-circuit conditions is followed by application of either differential or square wave voltammetry. The results obtained by differential pulse voltammetry at pH 2.9, with a modifier concentration of 10% and accumulation times of 120 and 300 s, allowed the development of a method to determine pentachlorophenol in the ranges of 1.0×10−6-1.0×10−5 and 1.0×10−7-1.0×10−6 mol l−1. The relative standard deviation is 2.6% for a concentration of 2.0×10−7 mol l−1, with a detection limit of 1.8×10−8 mol l−1 (5 ppb). The effect of other chlorophenols was studied. The results obtained by square wave voltammetry showed a behaviour typical of an irreversible electron transfer. Amplitude, step height and frequency were optimised, taking into account the resolution of the voltammetric response. No improvement in sensitivity was obtained with respect to DPV. Good results were obtained by applying the proposed differential-pulse voltammetric method to the determination of pentachlorophenol in a commercial fungicide. Springer-Verlag, 1992 Ruiz Barrio M. Department of Analytical Chemistry, Faculty of Chemistry, Complutense University of Madrid, E-28040, Madrid, Spain aut Pingarrón Carrazón J. Department of Analytical Chemistry, Faculty of Chemistry, Complutense University of Madrid, E-28040, Madrid, Spain aut Fresenius' Journal of Analytical Chemistry Springer-Verlag 344/1-2(1992-09-01), 34-38 0937-0633 344:1-2<34 1992 344 216 https://doi.org/10.1007/BF00324838 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00324838 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ruiz Barrio M. Department of Analytical Chemistry, Faculty of Chemistry, Complutense University of Madrid, E-28040, Madrid, Spain aut NATIONALLICENCE 700 1- Pingarrón Carrazón J. Department of Analytical Chemistry, Faculty of Chemistry, Complutense University of Madrid, E-28040, Madrid, Spain aut NATIONALLICENCE 773 0- Fresenius' Journal of Analytical Chemistry Springer-Verlag 344/1-2(1992-09-01), 34-38 0937-0633 344:1-2<34 1992 344 216 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer