Bismuth as a general internal standard for lead in atomic absorption spectrometry |
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Authors: | Marcos A. Bechlin,Felipe M. Fortunato,Edilene C. Ferreira,José A. Gomes Neto,Joaquim A. Nó brega,George L. Donati,Bradley T. Jones |
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Affiliation: | 1. São Paulo State University - Unesp, Analytical Chemistry Department, P.O. Box 355, Araraquara, SP 14801-970, Brazil;2. Federal University of São Carlos, Department of Chemistry, São Carlos, SP 13565-905, Brazil;3. Department of Chemistry, Wake Forest University, Winston-Salem, NC 27106, USA |
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Abstract: | Bismuth was evaluated as internal standard for Pb determination by line source flame atomic absorption spectrometry (LS FAAS), high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS) and line source graphite furnace atomic absorption spectrometry (LS GFAAS). Analysis of samples containing different matrices indicated close relationship between Pb and Bi absorbances. Correlation coefficients of calibration curves built up by plotting APb/ABiversus Pb concentration were higher than 0.9953 (FAAS) and higher than 0.9993 (GFAAS). Recoveries of Pb improved from 52–118% (without IS) to 97–109% (IS, LS FAAS); 74–231% (without IS) to 96–109% (IS, HR-CS FAAS); and 36–125% (without IS) to 96–110% (IS, LS GFAAS). The relative standard deviations (n = 12) were reduced from 0.6–9.2% (without IS) to 0.3–4.3% (IS, LS FAAS); 0.7–7.7% (without IS) to 0.1–4.0% (IS, HR-CS FAAS); and 2.1–13% (without IS) to 0.4–5.9% (IS, LS GFAAS). |
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Keywords: | Universal internal standard Bismuth Lead Atomic absorption spectrometry |
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