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Migration of Trace Elements from Pyrite Tailings in Carbonate Soils

Departamento Edafología, Facultad de Ciencias, Universidad de Granada, 18002 Granada, Spain

View larger version (143K): [in a new window]   Fig. 1. Layer of tailings covering the soils as result of the toxic spill and detail of the reddish-yellow layer (ryl) at the contact point between the tailings and soil (thickness of the reddish-yellow layer was 4 mm).

View larger version (25K): [in a new window]   Fig. 2. X-ray diffractograms of a powder sample from soil within (A) and below (B) the reddish-yellow layer. G, gypsum; Q, quartz; F, feldspars; C, calcite.

View larger version (24K): [in a new window]   Fig. 3. X-ray diffractograms of an oriented aggregate sample from soil within (A) and below (B) the reddish-yellow layer.

View larger version (111K): [in a new window]   Fig. 4. Microphotography by scanning electron microscopy (SEM) of soils in the interior of the reddish-yellow layer (at 2 mm from the contact point with the tailings). Photo 4.1: (SEM–energy dispersive spectrometry [EDS]) tabular crystals of gypsum (G) in a mass of Fe oxyhydroxides (O). Photo 4.2: (SEM–EDS) acicular crystals of Al sulfate (A) in a mass of sulfates of Fe, Al, Zn, and Ca (S).

View larger version (27K): [in a new window]   Fig. 5. Depth distribution (mean values) for the pollution of the different heavy metals and associated elements (in mg kg-1). The grey zone represents the samples of the reddish-yellow layer.