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Journal of Chemical Sciences
Volume 135, 2023
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Continuous Article Publishing mode
Reza Hajian
Articles written in Journal of Chemical Sciences
Volume 127 Issue 6 June 2015 pp 1075-1081 Regular Articles
Salamatu Aliyu Tukur Nor Azah Yusof Reza Hajian
A highly sensitive electrochemical sensor has been constructed for determination of Cr(VI) with the lowest limit of detection (LOD) reported to date using gold nanoparticles (AuNPs) modified screen-printed electrode (SPE). The modification of SPE by casting pure AuNPs increases the sensitivity for detection of Cr(VI) ion using anodic stripping voltammetry. Cr(VI) ions are reduced to chromium metal on SPE-AuNPs by applying deposition potential of –1.1 V for 180 s. Afterwards, the oxidation peak current of chromium is obtained by linear sweep voltammetry in the range of −1.0 V to 0.2 V. Under the optimized conditions (HClO4, 0.06 mol L$^{−1}$; deposition potential, –1.1 V; deposition time, 180s; scan rate, 0.1 V s$^{−1}$), the limit of detection (LOD) was 1.6 pg mL$^{−1}$. The fabricated electrode was successfully used for detection of Cr(VI) in tap and seawater.
Volume 135, 2023
All articles
Continuous Article Publishing mode
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