Abstract

MACIAS SOCHA, Claudia; GARCIA COLMENARES, Mauricio  and  CHAPARRO S., Patricia. ELECTROCHEMICAL DETERMINATION OF LEAD AND CADMIUM IN SURFACE WATER. Luna Azul [online]. 2017, n.44, pp.27-38. ISSN 1909-2474.  https://doi.org/10.17151/luaz.2017.44.3.

The square wave electrochemical voltammetry method (OSWV) to quantification of cadmium and lead in surface waters was validated. It used a Britton-Robinson buffer as solution supporting electrolyte to pH 4.8, working electrode glassy carbon, Ag/AgCl as reference electrode and platinum as counter electrode. The limit of detection determined was 211 ug/L for Pb and 268 ug/L for Cd. The application of voltammetric technique OSWV was performed in waters of the creek Towers Industrial Park Sector in Sogamoso (Colombia). The ions concentration in the samples analyzed was 0.750±0.067 mg/L for Pb²⁺ and 0.570±0.071 mg/L for Cd²⁺, exceeding the national and international standards limits for wastewater. The results obtained by voltammetry were compared with atomic absorption method spectrophotometer traditionally accepted, allowing deducing that the voltammetric method generates results with a confidence level of 95%.

Keywords : Voltammetry; vitreous carbon; heavy metals; voltammogram.

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