Heavy metals in rocks and stream sediments from the northwestern part of Baja California, México
In order to assess the amount of heavy metals apported by natural weathering to thecoastal area of the northwestern part of Baja California, México, rocks from outcrops,rock fragments and sediments from the Guadalupe River and other streams that draintowards this area were studied. Major elements (S...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1994 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:37010203 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=37010203 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias de la Tierra Cu Cd Zn Ni Cr |
| Sumario: | In order to assess the amount of heavy metals apported by natural weathering to thecoastal area of the northwestern part of Baja California, México, rocks from outcrops,rock fragments and sediments from the Guadalupe River and other streams that draintowards 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 samplesstudied. The Guadalupe River sediments show the greatest weathering and the SanAntonio 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 to1.49% for TiOn, 10 to 20 pprn for Cu, 10 ppm for Cd, 30 to 140 pprn for Zn, 30 to 40pprn for Ni, nondetected to 150 pprn for Cr. Al1 the reported concentration are withinvalues reported for non-contaminated soils, except Cr whose upper limit has beenestablished at 75 pprn in Switzerland and 100 pprn in Germany. |
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