TITLE:
The Geochemistry of Heavy Metals in the Mudflat of Salinas de San Pedro Lagoon, California, USA
AUTHORS:
Mohammad Hassan Rezaie-Boroon, Vanessa Toress, Sonya Diaz, Teresa Lazzaretto, Mathew Tsang, Dimitri D. Deheyn
KEYWORDS:
Salinas De San Pedro; Bioavailability; Heavy Metal; Geo-Accumulation Index; Enrichment Factor; Lagoon Water Pollution
JOURNAL NAME:
Journal of Environmental Protection,
Vol.4 No.1,
January
25,
2013
ABSTRACT:
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); - 0.069 (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.