Voltammetric Determination of Arsenic with Modified Glassy Carbon Electrode |
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| Authors: | Anamarija Stankovi&#x;
ana Kajini&#x; Jelena Ve&#x;ligaj Turkalj
eljka Romi&#x; Maja Dutour Sikiri&#x; Abdelilah Asserghine Geza Nagy Martina Medvidovi&#x;‐Kosanovi&#x; |
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| Institution: | Anamarija Stankovi?,?ana Kajini?,Jelena Ve?ligaj Turkalj,?eljka Romi?,Maja Dutour Sikiri?,Abdelilah Asserghine,Geza Nagy,Martina Medvidovi?‐Kosanovi? |
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| Abstract: | In this study, glassy carbon electrode modified with nano gold‐crystal violet film has been used to detect arsenite (As (III)) in a model system and in groundwater samples. The modified electrode was characterized by scanning electrochemical microscopy (SECM) and electrochemical impedance spectroscopy (EIS). Using voltammetric measuring technique, linear response was obtained in a concentration range of 2.0–22.0 μM. The arsenite concentrations in groundwater samples varied between 2.4 μM to 4.8 μM. The sensitivity of the modified electrode for As (III) detection was 5.6 μA/μM cm2 and 0.8 μM concentration was found as lower limit of detection (LOD). The accuracy of the method was checked with standard method anodic stripping voltammetry (ASV). Groundwater samples were characterized with dynamic (DLS) and electrophoretic (ELS) light scattering measurements which have shown that particles present in different samples differ in size distribution and zeta potential which did not interfere with As (III) detection. |
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| Keywords: | groundwater arsenic detection modified glassy carbon electrode SECM EIS |
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