期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 173, 期 -, 页码 914-918出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.07.119
关键词
Competing intercalation; Potassium; Sodium; Hexacyanoferrate; Simultaneous determination
资金
- National University of Singapore
- National Research Foundation and Economic Development Board (SPORE) [COY-15-EWI-RCFSA/N197-1]
- Ministry of Education [R-143-000-382-112, R-143-000-441-112]
A novel approach for simultaneous determination of K+ and Na+ based on Na+-inhibited and direct K+ intercalation processes at Prussian blue is proposed. The competing processes of Na+-inhibited and direct K+ intercalation were established for the first time using a Prussian blue pencil graphite electrode (PB-PGE) and manipulation of the cyclic voltammetry (CV) scan rate. The pair of cathodic peak potentials result of Ne-inhibited and direct K+ intercalations was used as analytical signals for K+ and Na+ determination via a simultaneous standard addition method. Simultaneous determination of K+ and Na+ was demonstrated in a laboratory prepared sample with satisfactory results, suggesting the proposed approach is amenable for further development as a Prussian blue-based electrochemical method for simultaneous K+ and Na+ determination. (C)2012 Elsevier B.V. All rights reserved.
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