| Popis: |
Sediment samples from the La Zacatecana Dam together with samples from two sites, at 7 and 180 km N.W. of the dam, were analyzed by instrumental neutron activation analysis and the concentration of mercury and 28 elements; As, Au, Ba, Br, Ce, Co, Cr, Cs, Eu, Fe, Ga, Hf, K, La, Na, Nd, Ni, Rb, Sb, Sc, Se, Sm, Sr, Ta, Tb, Th, U and Zn are reported. The ratio between the concentration of an element in the dam sediment and the average concentration at the other two sites (i.e. enrichment factor (EF) of the element) was calculated. Mercury showed an EF of 194. As, Au, Sb, Sm and Zn showed EFs of between 4–11. The EF for the rest of the measured elements was ∼ 1. |
