Origin of lead in the Gulf of California Ecoregion using stable isotope analysis
Por:
Soto-Jiménez M.F., Flegal A.R.
Publicada:
1 jun 2009
Resumen:
The magnitude and sources of lead (Pb) pollution in the Gulf of California Ecoregion (GCE) in northwest Mexico were evaluated using various samples collected from urban and rural areas around two typical subtropical coastal ecosystems. Lead concentrations and isotopic compositions ((206)Pb/(207)Pb, (208)Pb/(207)Pb, (206)Pb/(204)Pb and (208)Pb/(240)Pb) were measured using high resolution inductively-coupled plasma mass spectrometry (HR-ICP-MS) and thermal ionization mass spectrometry (TIMS). Urban street dust (157 +/- 10.1 mu g g(-1)) was heavily enriched with Pb, compared to the Pb enrichment of agricultural soils (29.0 +/- 16.0 mu g g(-1)) and surface estuary sediments (35.6 +/- 15.4 mu g g(-1)), all of which contained higher Pb concentrations than found in the natural bedrock (16.0 +/- 5.0 mu g g(-1)). Pb concentrations in SPM (> 95% of total Pb) were significantly higher in sewage effluent (132 +/- 49.9 mu g g(-1)) than in agricultural effluents (29.3 +/- 5.9 mu g g(-1)), and river
Filiaciones:
Soto-Jiménez M.F.:
Univ Nacl Autonoma Mexico, Inst Limnol & Marine Sci, Mazatlon 82040, Mexico
Flegal A.R.:
Department of Environmental Toxicology, WIGS, University of California at Santa Cruz, Santa Cruz, CA 95064, United States
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