Sediment core samples were collected from
the Salinas de San Pedro to assess the pollutant deposition processes in response
to extensive human activities. Analysis of the sediment samples for heavy metals
and some trace elements was conducted with ICP-OES for 20 sites showing enrichment
for some of trace and heavy metals. The results demonstrated that heavy metal concentrations
in mud varied greatly for each metal, with concentration values (mg/g)ranging from 1.05-4.8 (Al); 0.003-0.011(As); 0.001-0.005 (Cd); 0.02 to 0.82 (Cr); 0.085-0.47 (Cu); 5.98-14.22 (Fe); 0.06-0.19 (Mn); 0.03-0.67 (Ni); 0.05-0.38 (Pb); <0.008-0.069 (Se); 0.18-0.63 (Ti); 0.040-0.091 (V) and 0.149-0.336 (Zn). The Index of Geo-accumulation
factor showed highest values for Pb, Mn, As, and Cu. Enrichment factors >1for
these elements suggest anthropogenic inputs for most metals. The bioavailability
of metals in lagoon sediments has the potential to be highly dynamic with local
waste and natural H2S discharge from existing fault line.
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