Determination of Cadmium and Lead in Concrete Roofing Tiles by Differential Pulse Anodic Stripping Voltammetric Method
Jaroon Junsomboon[a]* and Jaroon Jakmunee[b]* Author for corresponding; e-mail address: jaroon@dss.go.th
Volume: Vol.43 No.5 (OCTOBER 2016)
Research Article
DOI:
Received: 17 March 2014, Revised: -, Accepted: 27 October 2014, Published: -
Citation: Junsomboon J. and Jakmunee J., Determination of Cadmium and Lead in Concrete Roofing Tiles by Differential Pulse Anodic Stripping Voltammetric Method, Chiang Mai Journal of Science, 2016; 43(5): 1122-1130.
Abstract
Differential pulse anodic stripping voltammetric method has been developed for determination of cadmium and lead released from concrete roofing tiles. The sample was extracted with water for 24 h according to the TIS 535-2540 standard method. An aliquot of 5 mL of the extracted solution and 5 mL of 4% v/v acetic acid solution were put in a voltammetric cell. Then, the solution was stirred at 2000 rpm and purged with nitrogen gas for 3 min before the deposition of the metals was carried out by applying a constant potential of -0.90 V versus Ag/AgCl to a hanging mercury drop electrode (HMDE) for 45 s. After that a differential pulse scanning waveform from -0.90 to -0.10 V was applied and a voltammogram was recorded. Peak current of cadmium and lead were measured at peak potentials of -0.555 and -0.364 V vs Ag/AgCl, respectively. Standard addition procedure was used for quantification. Relative standard deviation for 11 replicate determinations of 8 mgL-1 of both metals were in the range of 1.59 - 1.74%. Percentage recoveries obtained by spiking 8 mgL-1 of cadmium and lead to the sample solution were found to be 107% and with detection limit of 0.15 mgL-1 for both metals. It was found that contents of cadmium and lead released from the concrete roofing tile samples were in the range of < 0.15 - 0.49 mgL-1 and < 0.15 - 11.95 mgL-1, respectively, which are lower than the regulated values of the Thailand industrial standard (TIS 535-2540). The proposed method is simpler, more convenient and more sensitive than the standard method based on an atomic absorption spectrophototometry.
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