Determinação de Selênio em água subterânea utilizando a espectrometria de absorção atômica com atomização eletrotérmica em forno de grafita (GFAAS) e geração de hidretos (HGAAS) / Determination of selenium in underground water using atomic absorption spectrometry with graphite furnace (GFAAS) and hydride generation (HGAAS)

AUTOR(ES)

Alcides Gomes Júnior

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

16/12/2008

RESUMO

Report carried out for CETESB in 2006 showed 80% of the 645 cities are totally or partially supplied by underground water, and for 13 river basins of São Paulo State the underground water is the priority source for potable water supply. The use of underground water in different sectors reinforces its importance and highlight the concern about their protection and quality. The northwest region of São Paulo state is mainly supplied by underground water of the Guarani aquifer extracted by tubular wells, which presents some occurrence of Selenium. In the present study it was looked and evaluated, through the comparison of high sensitivity and selectivity methods as the atomic absorption spectrometry using electrothermal atomizaton (GFAAS) and the hydride generation (HGAAS). Underground water samples of four deep tubular wells of Guarani aquifer in the northwest of São Paulo state were collected to measure the selenium element. In addition to selenium other metals were analyzed (B, Al, V, Cr, Mn, Ni, Cu, Zn, Mo, Sn, Li, Be, Mg, P, Ca, Fe, Ba, Co, Na, Si, K, Ag, Cd, Pb, Sb, Hg and As). The characterization of selenium was carried out with quarterly sampling regularity, in the period of March of 2006 to March of 2007, totalizing five campaigns. The metal analyzed in this study was selected according to the requirements of the legislation for potable water quality evaluation, establishing permissible maximum limits for metal concentration. The results had shown the concentrations of Se are above of the maximum permissible limits and the techniques electrothermal atomization (GFAAS) and hydride generation (HGAAS) demonstrated equivalence in their results. The results demonstrated also the presence of Se can be associated with mineralogical factors (as geologic formation of the region) and the applied methodologies were efficient with similar answers for different operational factors and expenses.

ASSUNTO(S)

absorção atômica água subterrânea atomic absorption selênio selenium underground water

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