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Heavy metals in rocks and stream sediments from the northwestern part of Baja California, México

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In order to assess the amount of heavy metals apported by natural weathering to the coastal area of the northwestern part of Baja California, México, rocks from outcrops, rock fragments and sediments from the Guadalupe River and other streams that drain towards this area were studied. Major elements (Si, Al, Na, K, Ca, Mg, P, Fe, Mn and Ti) and some trace elements (Cu, Cd, Zn, Ni, Cr and Pb) were evaluated in the samples studied. The Guadalupe River sediments show the greatest weathering and the San Antonio stream sediments show the lowest values of the index of chemical alteration. Heavy metal concentration in stream sediments were: 0.02 to 0.17% for MnO, 0.07 to 1.49% for TiOn, 10 to 20 pprn for Cu, 10 ppm for Cd, 30 to 140 pprn for Zn, 30 to 40 pprn for Ni, nondetected to 150 pprn for Cr. Al1 the reported concentration are within values reported for non-contaminated soils, except Cr whose upper limit has been established at 75 pprn in Switzerland and 100 pprn in Germany.
Palabras clave: heavy metals, sediment pollution, Cu, Cd, Zn, Ni, Cr, Ti.
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Sistema de Información Científica Redalyc
Red de Revistas Científicas de América Latina y el Caribe, España y Portugal
Universidad Autónoma del Estado de México
Versión 2.2 beta | 2015
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