by Rosas et al., 1983. in the Tampamachoco and
Mandinga Lake, in the Del-Carmen-Lake Tabasco
and in the Atasta-Lake Campeche. Avila-P´erez
and Zaraz´ua-Ortega, 1993b. have also reported
lower concentrations than the ones encountered
here for the El Chijol Channel, in the State of
Veracruz. Thus, the Alzate Reservoir seems to
possess particulate metal concentrations that are
among the highest in the country. The similarity
of our results with values encountered in areas
affected by contamination problems Villanueva
and Botello, 1992., indicates the role of the industrial
activities in the sediment metal contamination
phenomenon of the Alzate Reservoir.