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|Title: ||Critical study using experimental design of the determination of lead by high-resolution continuum source hydride generation atomic absorption spectrometry|
|Other Titles: ||Journal of Analytical Atomic Spectrometry|
|Authors: ||Oliveira, Olívia Maria Cordeiro de|
Ferreira, Sergio Luis Costa
Lima, Daniel de Castro
Moreira, Icaro T. A.
|Issue Date: ||2011|
|Abstract: ||The present study critically evaluates quartz tube (QT) atomisation and high-resolution continuum source hydride generation atomic absorption spectrometry (HR-CS HG-AAS) for the determination
of lead. A full two-level factorial design was performed to characterise the effects of the following reagent concentrations on the analytical procedure: sodium tetrahydroborate, potassium
hexacyanoferrate(III) and nitric acid. This chemometric tool demonstrated that an increasing acid concentration increases hydrogen production, which dilutes the analyte in the quartz tube during
analytical measurements. The experimental conditions established in the final procedure were determined using a Box–Behnken design. The method was used to determine the concentration of lead in water samples, with limits of detection and quantification of 0.13 and 0.40 mg L 1,
respectively. Method precision, expressed as relative standard deviation (RSD), was 6.36% and was obtained with a 10.00 mg L-1 lead solution. The accuracy was confirmed by determining the lead concentration in the NIST standard reference material, SRM 1643d, for trace elements in natural water. This method was then used to determine the lead concentration in eighteen water samples
collected in the São Paulo River (Bahia State, Brazil). The lead concentrations varied from 0.62 to 3.73 mg L-1. All samples were also analysed by inductively coupled plasma mass spectrometry (ICPMS).
Statistical tests demonstrated that there was no difference between the results obtained by both procedures.|
|Description: ||texto completo: acesso restrito. p. 2039–2044.|
|Appears in Collections:||Artigos Publicados em Periódicos (Quimica)|
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