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Selenium in municipal wells in the Irapuato City - spectrofluorimetric
determination with 2,3-diaminonaphthalene.
K. Wróbel*, P.L. López-de-Alba,
L. López-Martínez, L.E. Pantoja Villagómez
Instituto de Investigaciones Científicas,
Universidad de Guanajuato, L. De Retana NE5,36000 Guanajuato,
Mexico. *Corresponding author e-mail: katarzyn@quijote.ugto.mx
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Abstract
A chromatographic procedure with spectrofluorimetric
detection ( = 257 nm, =548 nm) is proposed in this work for Se determination
in well water after formation of a piazselenol compound. The low
detection limit obtained (15 ng·1-1)
enabled minimisation of the sample size and, consequently, smaller
amounts of reagents were needed. Selenium content was confirmed
using standard reference material. The proposed procedure was applied
for the determination of Se in municipal wells in Irapuato city
(Lerma-Chapala basin) and the obtained results showed that 52.5%
of the analysed wells contained amounts higher than the limit 10
µg·1-1 of selenium
as recommended by the World Health Organisation for drinking water.
The high selenium levels were found only in the wells of the city
of Irapuato (concentration range 12 - 223 µg 1-1),
not in the wells in other cities of the State of Guanajuato. No
contamination by other trace elements (arsenic, cadmium, chromium,
iron, manganese, lead) was found in Irapuato wells.
Keywords: high performance liquid chromatography
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