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Trace level voltammetric determination of lead and cadmium in sediment pore water by a bismuth-oxychloride particle-multiwalled carbon nanotube composite modified glassy carbon electrode
Authors: Cerovac Sandra | Guzsvany Valeria | Konya Zoltan | Ashrafi Amirmansoor | Švancara Ivan | Roncevic Srdan | Kukovecz Akos | Dalmacija Bozo | Vytřas Karel
Year: 2015
Type of publication: článek v odborném periodiku
Name of source: Talanta
Page from-to: 640-649
Titles:
Language Name Abstract Keywords
cze Stopová analýza olova a kadmia ve vodě v pórech sedimentu pomocí elektrody ze skelného uhlíku modifikované uhlíkovými nanotrubičkami s chloridem bismutylu Byly syntetizovány uhlíkové nanotrubičky modifikované bismutem a chloridem bismutylu, které byly uchyceny na povrch elektrody ze skelného uhlíku. Výsledné konfigurace byly charakterizovány s ohledem na jejich fyzikálně-chemické vlastnosti a elektroanalytické chování. Příslušné metody s využitím obou typů elektrod byly následně zkoumány z hlediska stanovení stopových obsahů iontů Pb2+ and Cd2+ ve vodě v pórech vybraného sedimentu. Vícestěnné uhlíkové nanotrubičky s chloridem bismutylu; Vícestěnné uhlíkové nanotrubičky s bismutem; Modifikované elektrody; Olovo a kadmium; Stanovení; Voda v pórech sedimentu
eng Trace level voltammetric determination of lead and cadmium in sediment pore water by a bismuth-oxychloride particle-multiwalled carbon nanotube composite modified glassy carbon electrode Two multiwalled carbon nanotubes-based composites modified with bismuth and bismuth-oxychloride particles were synthesized and attached to the glassy carbon electrode substrate. The resultant configurations, Bi/MWCNT-GCE and BiOCl/MWNT-GCE, were then characterized with respect to their physicochemical properties and electroanalytical performance in combination with square-wave anodic stripping voltammetry (SWASV). Further, some key experimental conditions and instrumental parameters were optimized; namely: the supporting electrolyte composition, accumulation potential and time, together with the parameters of the SWV-ramp. The respective method with both electrode configurations has then been examined for the trace level determination of Pb2+ and Cd2+ ions and the results compared to those obtained with classical bismuth-film modified GCE. The different intensities of analytical signals obtained at the three electrodes for Pb2+ and Cd2+ vs. the saturated calomel reference electrode had indicated that the nature of the modifiers and the choice of the supporting electrolyte influenced significantly the corresponding stripping signals. The most promising procedure involved the BiOCl/MWCNT-GCE and the acetate buffer (pH 4.0) offering limits of determination of 4.0 mu g L-1 Cd2+ and 1.9 mu g L-1 Pb2+ when accumulating for 120 s at a potential of -.20 V vs. ref. The BiOCl/MWCNT electrode was tested for the determination of target ions in the pore water of a selected sediment sample and the results agreed well with those obtained by graphite furnace atomic absorption spectrometry. Bismuth-oxychloride/multiwalled carbon nanotubes; Bismuth/multiwalled carbon nanotubes; Modified electrodes; Lead and cadmium; Determination; Sediment pore water

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