Suero De Jesús, Iris E.

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    Electrochemical redox process analysis of Cu+2 and Fe+3 ions in natural waters using cyclic voltammetry technique
    (2012-12) Suero De Jesús, Iris E.; Vega Olivencia, Carmen A.; College of Arts and Sciences - Sciences; Joubert, Aidalu; López Garriga, Juan; Department of Chemistry; Nieto, Miriam J.
    The concentration and distribution of trace metals in natural water is important in order to have a better understanding of their biogeochemical behavior and natural cycles. This biological behavior and natural cycles are associates with the global warming effect, which is one of the most important concerns for scientists these days. Copper (Cu) and Iron (Fe) are important trace metal in natural waters. Copper (Cu) and Iron (Fe) are found in are found in nature in the oxidation state of Cu (II)/Cu (I) and Fe (III)/ Fe (II). Recent researches have determined that Cu can exist in the oxidation state (I), which is lethal to microorganism when the concentration exceeds the Environmental Standard Quality of 5 µg/L (annual average). Hydrogen peroxide (H2O2), a strong reductant agent, formed in natural water by the interaction with the ultra-violet light react causing the reduction of Cu (II) to form Cu (I). The oxidation-reduction process of these elements has been studied using UV- Vis Spectrophotometric system, Cathodic Stripping Voltametry, Colorimetric technique and Quimiolumisniscense. However, Cyclic Voltammety (CV) is a very fast, accessible and economic analytical technique that can be used for the analysis of trace metal in natural waters. The effectiveness of CV results from its capacity for rapidly observing the reductionoxidation (redox) behavior of analytes over a wide potential range applied. Our research was focus on the development of an experimental design for the determination of these elements, Cu (II) and Fe (III), using standard addition method by Cyclic Voltammetry. Consequently, the optimization of the following instrumental parameters: Working electrode, Potential Window, Scan Rate and Sensitivity. Our results indicate that the levels of Cu (II) and Fe (III) ions concentration in the seawater of Mayaguez coast were 7.7 (± 1) µM and 1.7 (±0.4) µM, respectively. The pH and salinity measured of the seawater of Mayaguez, P.R. were 8.07 and 26.42 mgL-1 , respectively.