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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064

Abstract

GONZALEZ, Elizabeth et al. Thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS): application for total determination of Cd, Pb and Zn in fresh waters, seawater and marine sediments. Quím. Nova [online]. 2004, vol.27, n.6, pp.873-877. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422004000600006.

Thermospray flame furnace Atomic Absorption Spectrometry (TS-FF-AAS) was used for the total determination of Cd, Pb and Zn in fresh water and seawater samples at µg L-1 levels, and in marine sediment samples at µg g-1 levels. Using a sample loop of 50 µL and a peristaltic pump the samples were transported into the metallic tube placed over an air/acetylene flame, through a ceramic capillary (o.d. = 3.2 mm) containing two parallel internal orifices (i.d = 0.5 mm). The detection limits determined for Cd, Pb and Zn using a synthetic water matrix (2.5% m/v NaCl, 0.5% m/v MgCl2 and 0.8% m/v CaCl2) were 0.32 µg L-1; 2.6 µg L-1 and 0.21 µg L-1 respectively. The methodology by TS-FF-AAS was validated by determination of Cd, Pb and Zn in certified reference materials of water and marine sediment, and the t-test for differences between means was applied. No statistically significant differences were established in fresh water and seawater (p>0.05), whereas differences became apparent in marine sediment (p<0.03).

Keywords : water; sediment; TS-FF-AAS.

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