Novel anode stripping voltammetric method using electrochemically modified electrodes for arsenic species detection in water
| dc.contributor.author | Kashmitha, S. D. S. | |
| dc.contributor.author | Wickramasinghe, N. A. | |
| dc.contributor.author | Wijesinghe, M. B. | |
| dc.date.accessioned | 2024-10-28T06:30:04Z | |
| dc.date.available | 2024-10-28T06:30:04Z | |
| dc.date.issued | 2024-11-01 | |
| dc.description.abstract | Arsenic is a heavy metal that is particularly toxic in its inorganic form, As ³ ⁺, and causes health issues in humans, even in trace amounts. Conventional analytical techniques for detecting As ³ ⁺, such as atomic absorption spectroscopy, inductively coupled plasma mass spectrometry, and neutron activation analysis, are not suitable for real-time onsite detection of arsenic in water, which is essential for minimizing arsenic contamination. Recent studies have reported that anodic stripping voltammetry on a modified glassy carbon electrode offers a cheaper and field-portable alternative for detecting trace amounts of As ³ ⁺ in water samples. The drop-casting method was used to modify the bare electrode with AuNPs in such studies. However, the drop-casting method leads to poor reproducibility and high noise levels. Alternatively, this study employed the electrochemical deposition of AuNPs from a solution of 1.00 mM HAuCl₄ in 0.500 M H₂SO₄ by cathodically scanning the potential between +1.0 V and -0.6 V at a scan rate of 50 mV/s under air-saturated conditions. The optimum number of cycles for the electrodeposition was found to be twenty. A detection limit of 0.0625 mM for As ³ ⁺ with an R² value of 0.9847 was obtained through cyclic voltammetric analysis of As ³ ⁺ in 0.500 M H₂SO₄ on the modified electrode. An enhanced detection limit of 100 nM, with an R²value of 0.9723, was achieved using anodic stripping voltammetry. The deposition time and applied voltage for the anodic stripping analysis were optimized to 1200 s and -0.4 V, respectively. Future studies will focus on analysing water and soil samples using the newly developed method. | |
| dc.identifier.citation | Proceedings of the Postgraduate Institute of Science Research Congress (RESCON) -2024, University of Peradeniya, P 40 | |
| dc.identifier.issn | 3051-4622 | |
| dc.identifier.uri | https://ir.lib.pdn.ac.lk/handle/20.500.14444/2651 | |
| dc.language.iso | en | |
| dc.publisher | Postgraduate Institute of Science (PGIS), University of Peradeniya, Sri Lanka | |
| dc.relation.ispartofseries | Volume 11 | |
| dc.subject | Anodic stripping voltammetry | |
| dc.subject | Arsenic | |
| dc.subject | Electrodeposition | |
| dc.subject | Gold nanoparticles | |
| dc.subject | Modified glassy carbon electrode | |
| dc.title | Novel anode stripping voltammetric method using electrochemically modified electrodes for arsenic species detection in water | |
| dc.type | Article |