Development of a sequential injection anodic stripping voltammetry (SI-ASV) method for determination of Cd(II), Pb(II) and Cu(II) in wastewater samples from coatings industry |
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Authors: | Allan C Vieira dos Santos Jorge C Masini |
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Institution: | 1. Instituto de Química, Universidade de S?o Paulo, C.P. 26077, 05513-970, S?o Paulo, SP, Brazil
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Abstract: | This paper describes the development and validation of a sequential injection (SI) anodic stripping voltammetry (ASV) method
using the hanging mercury drop electrode for accumulation of the heavy metal cations Cu(II), Pb(II) and Cd(II). The method
was applied to wastewater samples after proper acid digestion in open vessels to eliminate matrix effects. For a deposition
time of 90 s at the flow rate of 10 μl s−1, the detection limits of the method were 0.06, 0.09 and 0.16 μmol L−1 for Cd, Pb and Cu, respectively. Under these conditions the linear dynamic range was between 0.20 and 9.0 μmol L−1 and the sampling frequency was 30 analyses per hour. The relative standard deviation of the method was 3%(n=7) at the concentration level of 2.0 μmol L−1. The accuracy of the method was evaluated by spiking the samples with known amounts of the metal cations, and by comparison
with an independent analytical technique, the inductively coupled plasma atomic emission spectroscopy (ICP-AES). Average recoveries
were around of 84%, and the results showed no evidence of systematic errors in comparison to the ICP-AES. |
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Keywords: | Sequential injection analysis Wastewater Heavy metals Coatings industry |
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