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|Type:||Artigo de periódico|
|Title:||Flow Injection Visible Diffuse Reflectance Quantitative Analysis Of Nickel.|
Queiroz, Carlos A R
|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 x 10(-4) and 6.6 x 10(-4)molL(-1). This correlation is described by the equation S=-1.108+3.314 x 10(4)C-2.081 x 10(7)C(2) (r=0.9996). The experimentally observed limit of detection is about 1.3 x 10(-4) molL(-1), as in lower concentrations the formation of precipitate is not observed. The experimental quantitation limit is about 1.6 x 10(-4) molL(-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.|
|Citation:||Analytica Chimica Acta. v. 600, n. 1-2, p. 199-204, 2007-Sep.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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