Flow injection visible diffuse reflectance quantitative analysis of nickel |
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Authors: | Tubino Matthieu Queiroz Carlos A R |
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Institution: | aInstituto de Química, Universidade Estadual de Campinas, CP 6154, CEP 13083-970 Campinas, SP, Brazil |
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Abstract: | Flow injection (FI) methodology, using diffuse reflectance in the visible region of the spectrum, for the analysis of nickel, precipitated in the form of dimethylglyoximate, is presented. A reflectance cell, constructed in polytetrafluoroethylene, using a LED (light emitting diode) as light source and a LDR (light dependent resistor) as detector, is described. The analytical signal (S) correlates with nickel concentration (C) between 1.6 × 10−4 and 6.6 × 10−4 mol L−1. This correlation is described by the equation S = −1.108 + 3.314 × 104C − 2.081 × 107C2 (r = 0.9996). The experimentally observed limit of detection is about 1.3 × 10−4 mol L−1, as in lower concentrations the formation of precipitate is not observed. The experimental quantitation limit is about 1.6 × 10−4 mol L−1. The mean R.S.D. (relative standard deviation) is about 2.7%. Samples containing nickel were analyzed and the results obtained in this method were compared with those of other methods using the statistical Student's t-test. |
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Keywords: | Flow injection Nickel Determination Diffuse reflectance Visible Dimethylglyoxime |
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