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- W2267470251 abstract "In order to assess the amount of heavy metals apported by natural weathering to the coastal area of the northwestern part of Baja California, Mexico, 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 ppm for Cu, 10 ppm for Cd, 30 to 140 ppm for Zn, 30 to 40 pprn for Ni, non detected to 150 ppm for Cr. All the reported concentration are within values reported for non-contaminated soils, except Cr whose upper limit has been established at 75 ppm in Switzerland and 100 ppm in Germany." @default.
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- W2267470251 date "1994-01-01" @default.
- W2267470251 modified "2023-10-03" @default.
- W2267470251 title "Heavy metals in rocks and stream sediments from the northwestern part of Baja California, México" @default.
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