期刊
TALANTA
卷 116, 期 -, 页码 1018-1025出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2013.08.030
关键词
Long-lasting electrode; Sequential injection analysis; Screen-printed carbon electrode; Anodic stripping voltammetry; Arsenic determination
资金
- Thailand Research Fund under the Royal Golden Jubilee Ph.D. Program [PHD/0320/2551]
- Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission [CU56-AM03]
- Integrated Innovation Academic Center: IIAC Chulalongkorn University Centenary Academic Development Project
- 90th Anniversary of Chulalongkorn University Fund (Ratchadaphiseksomphot Endowment Fund)
- Thai Government Stimulus Package 2 under the Project for Establishment of Comprehensive Center for Innovative Food, Health Products and Agriculture (PERFECTA) [TKK2555]
- Grants-in-Aid for Scientific Research [25620114] Funding Source: KAKEN
An automated method has been developed for determining the concentration of inorganic arsenic. The technique uses sequential injection/anodic stripping voltammetry with a long-lasting gold-modified screen-printed carbon electrode. The long-lasting gold electrode was electrochemically deposited onto a screen-printed carbon electrode at a potential of -0.5 V vs. Ag/AgCl in a supporting electrolyte solution of 1 M hydrochloric acid. Under optimal conditions and the applied potentials, the electrode demonstrated that it can be used for a long time without a renewal process. The linear range for the determination of arsenic(III) was 1-100 mu g L-1, and the limit of detection (LOD) in standard solutions was as low as 0.03 mu g L-1 for a deposition time of 120 s and sample volume of 1 mL. This method was used to determine the concentration of arsenic(III) in water samples with satisfactory results. The LOD in real samples was found to be 0.5 mu g L-1. In addition, speciation between arsenic(III) and arsenic(V) has been achieved with the proposed method using deposition potentials of -0.5 V and -1.5 V for the determination of the arsenic(III) concentration and the total arsenic concentration, respectively; the results were acceptable. The proposed method is an automated system that offers a less expensive alternative for determining trace amounts of inorganic arsenic. (C) 2013 Elsevier B.V. All rights reserved.
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