Figure 3.

Elemental characterization of sediment and PM₁₀ samples. A, Sediment grains < 63 µm (separated by a physical sieve) displayed a relatively greater concentration of numerous toxic metal species, including uranium (U), vanadium (V), and As. Data are shown as the enrichment factor, or ratio of < 63 µm grains compared with the whole sediment sample. Three mine site samples and background sediments are shown. B, Diameters of grains obtained from sediment samples that were resuspended and captured in the next-generation impactor, then resuspended in dispersion media for aspiration treatments were < 10 µm in diameter, as assessed by dynamic light scattering. C, ICP-MS assessment of trace elements in Claim 28 and background PM₁₀ samples.