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  • Title: Distribution of selenium, molybdenum and uranium in sediment cores from the Colorado River delta, Baja California, Mexico.
    Author: Orozco-Durán A, Daesslé LW, Gutiérrez-Galindo EA, Muñoz-Barbosa A.
    Journal: Bull Environ Contam Toxicol; 2012 Jan; 88(1):104-7. PubMed ID: 22052136.
    Abstract:
    The distribution of selenium, molybdenum and uranium was studied in ~1.5 m sediment cores from the Colorado River delta, at the Colorado (CR) and Hardy (HR) riverbeds. Core HR2 showed highest Se, Mo and U concentrations at its bottom (2.3, 0.95 and 1.8 μg g(-1)) within a sandy-silt layer deposited prior to dam construction. In CR5 the highest concentrations of these elements (0.9, 1.4 and 1.7 μg g(-1) respectively) were located at the top of the core within a surface layer enriched in organic carbon. A few samples from HR2 had Se above the probable toxic effect level guidelines.
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