Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 139, Issue 2, Pages 604-610Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.03.045
Keywords
Carbon ionic liquid electrode; Hydroxyapatite; Square-wave anodic stripping voltammetry; Heavy metal
Funding
- National Outstanding Youth Foundations of China, National Science Foundation of China [50725825]
- Higher Education of China [20060532006]
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In this paper, a hydroxyapatite-modified carbon ionic liquid electrode (HAP-CILE) for the simultaneous determination of lead and cadmium was developed. The hydroxyapatite which combines with ionic liquid plays an important role in remarkable responses of metals. Trace analysis of the selected heavy metals was performed by Square-wave anodic stripping voltammetry (SWASV). The oxidation of two metals yielded well-defined, separated square-wave peak currents. The peak currents at about -0.34V for Pb2+ and -0.88V for Cd2+ were measured. The affecting factors containing supporting electrolyte, pH of solution, accumulation time, deposition potential, amount of hydroxyapatite and possible interferences were investigated. The sensor exhibited linear behavior in the range of 1 x 10(-9) mol L-1 to 1 x 10(-7) mol L-1 for lead and cadmium (correlation coefficients: 0.995 and 0.997, respectively) with detection limits of 2 x 10(-10) mol L-1 for lead and 5 x 10(-10) mol L-1 for cadmium. The results indicate that the sensor is sensitive and effective for the simultaneous determination of lead and cadmium. (c) 2009 Elsevier B.V. All rights reserved.
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