RESUMENEl método voltametría de onda cuadrada (OSWV) fue validado para la cuantificación de Cd 2+ y Pb 2+ en aguas superficiales. El estudio fue realizado usando solución BrittonRobinson como electrolito de soporte a pH 4,8, carbón vítreo como electrodo de trabajo, Ag/AgCl como electrodo de referencia y platino como electrodo auxiliar. La técnica presenta un límite de detección 211 µg/L para Pb y 268 µg/L para Cd. La aplicación de la técnica voltamétrica OSWV fue realizada en aguas de la quebrada Las Torres del sector Parque Industrial en Sogamoso (Colombia), hallando una concentración de: Pb 2 + 0,750±0,067 mg/L y Cd 2 + 0,570±0,071 mg/L, los cuales sobrepasan los límites máximos establecidos por las normas nacionales (Decreto 4728/2010) e internacionales vigentes para aguas residuales. Los resultados fueron contrastados por el método de referencia espectrofotometría de absorción atómica aceptado como referencia, permitiendo deducir que el método electroquímico genera resultados con un nivel de confianza del 95%. PALABRAS CLAVEVoltametría, carbón vítreo, metales pesados, voltagrama. ELECTROCHEMICAL DETERMINATION OF LEAD AND CADMIUM IN SURFACE WATER ABSTRACTThe 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 µg/L for Pb and 268 µg/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 Pb 2 + and 0.570±0.071 mg/L for Cd 2 +, 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%. KEY WORDSVoltammetry, vitreous carbon, heavy metals, voltammogram.
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