Comparison of metallic and ceramic tubes as atomization cells for tin determination by TS-FF-AAS

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Lobo, Fabiana Aparecida [UNESP]
Villafranca, Ana Cristina [UNESP]
De Oliveira, Adriana Paiva
De Moraes, Mercedes [UNESP]

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This work describes the development of an analytical procedure for on-line tin determination using thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS). Two tubes were evaluated as atomization cells: a metallic tube (Ni-Cr, principal components composition: 73.95% Ni and 16.05% Cr) and a ceramic tube (998% Al2O3,). The use of air as the carrier was made by employing a Rheodyne valve to inject the samples, allowing an analytical frequency of 90 h-1 and avoiding sample dispersion. The carrier flow rate (air), sample volume injected, and acid concentration (HCl) were evaluated for the optimization of the TS-FF-AAS system. The sensitivity for 50 mL of analytical solution with TS-FF-AAS was 2 and 5 times higher (to metallic and ceramic tube, respectively) than using an acetylene-nitrous oxide flame with pneumatic aspiration (requiring a sample volume of approximately 20 times higher).



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Atomic Spectroscopy, v. 28, n. 1, p. 17-23, 2007.