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Spectroscopic Speciation and Quantification of Lead in Phosphate-Amended Soils

USEPA, National Risk Management Research Laboratory, 5995 Center Hill Avenue, Cincinnati, OH 45224

View larger version (19K): [in a new window]   Fig. 1. Diagram of samples including control and three categories of amendments. Amendments included triple superphosphate (TSP), rock phosphate (RP), phosphoric acid (H3PO4), iron-rich waste (IRR), and composted biosolids (CB).

View larger version (34K): [in a new window]   Fig. 2. Normalized PbLIII–X-ray absorption fine structure spectroscopy (XAFS) k3–weighted chi spectra of reference samples employed as model components for linear combination fitting.

View larger version (29K): [in a new window]   Fig. 3. Normalized PbLIII–X-ray absorption fine structure spectroscopy (XAFS) k3–weighted chi spectra of field samples. The solid lines are the raw data and the dotted lines are the fit results from linear combination of k3–weighted chi reference spectra from Fig. 2.