Electrochemical determination of sulfite and phenol using a carbon paste electrode modified with ionic liquids and graphene nanosheets: Application to determination of sulfite and phenol in real samples |
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| Affiliation: | 1. Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran;2. Department of Chemistry, Shahid Bahonar University of Kerman, P.O. Box 76175-133, Kerman, Iran;3. Department of Basic Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran;1. School of Food and Biological Engineering, Hefei University of Technology, Hefei 230009, China;2. CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;3. China National Institute of Standardization, Beijing 100191, China;4. Research Laboratory of Agricultural Environment and Food Safety, Anhui Modern Agricultural Industry Technology System, Hefei 230009, China;1. Institute of Chemistry, Federal University of Uberlandia, 38400-902, Uberlandia, Minas Gerais, Brazil;2. Institute of Exact and Natural Sciences of Pontal, Federal University of Uberlandia, 38304-402, Ituiutaba, Minas Gerais, Brazil;1. Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran;2. Department of Chemistry, Graduate University of Advanced Technology, Kerman, Iran;3. Biotechnology Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran;1. Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science (Ministry of Education), State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China;2. Department of Applied Chemistry, College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266510, China |
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| Abstract: | Benzoylferrocene was used to construct a modified-graphene paste electrode. Also, hydrophilic ionic liquid (n-hexyl-3-methylimidazolium hexafluoro phosphate) was used as a binder to prepare the modified electrode. The electro-oxidation of sulfite at the surface of the modified electrode was studied using electrochemical approaches. This modified electrode offers a considerable improvement in voltammetric sensitivity toward sulfite, compared to the bare electrode. Square wave voltammetry (SWV) exhibits a linear dynamic range from 5.0 × 10?8 to 2.5 × 10?4 M and a detection limit of 20.0 nM for sulfite. The diffusion coefficient and kinetic parameters (such as electron transfer coefficient and the heterogeneous rate constant) for sulfite oxidation were also determined. The prepared modified electrode exhibits a very good resolution between the voltammetric peaks of sulfite and phenol that makes it suitable for the detection of sulfite in the presence of phenol in real samples. |
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| Keywords: | Sulfite Phenol Carbon paste electrode Graphene nano-sheets Ionic liquids |
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