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Dissolution of Trace Element Contaminants from Two Coastal Plain Soils as Affected by pH

Department of Soil Science, North Carolina State University, Box 7619, Raleigh, NC 27695-7619

View larger version (20K): [in a new window]   Fig. 1. Typical trends of dissolved Cu (•), Pb (), and Zn () concentrations and pH (—) in effluent solutions collected during a column flow experiment on a soil sample from the Bogue site (Bo-2) as a function of the throughput volume of acidified, 0.01 mol CaCl2 L–1 solution.

View larger version (24K): [in a new window]   Fig. 2. Dissolved concentrations of Cu (A), Pb (B), and Zn (C) in effluent solutions for column flow experiments on eleven soil samples from the Bogue (Bo) and Atlantic (At) sites. For reference, ground water standards adopted in North Carolina were 1.0 mg Cu L–1, 0.015 mg Pb L–1, and 2.1 mg Zn L–1.

View larger version (37K): [in a new window]   Fig. 3. Stacked, chromium K-XANES (X-ray absorption near edge structure) spectra for soil samples collected for a preliminary study (Hesterberg, 2001) at various depths from sampling locations around the incinerator at the Bogue site. A comparison with standards containing 0 or 10 mol % of total Cr as Cr(VI) indicated that <10% of the Cr in the soil samples was Cr(VI). Samples designated as Bo4*, Bo7*, and Bo8* correspond to samples listed in Tables 1 and 2 that were in closest proximity.

View larger version (40K): [in a new window]   Fig. 4. Arsenic K-XANES (X-ray absorption near edge structure) spectra for soil samples collected for a preliminary study (Hesterberg, 2001) from sampling locations around the incinerator at the Bogue site as compared with As(III) and As(V) standards. Spectra for soil samples showed that As(V) was dominant. The energy scale is normalized to the K edge of elemental As at 11867 eV. See Fig. 3 caption for sample designations.

View larger version (33K): [in a new window]   Fig. 5. Copper K-XANES (X-ray absorption near edge structure) spectra for soil samples Bo1* and Bo4* (collected in the vicinity of samples Bo1 and Bo4 from this study) and Cu standards used for linear combination fitting. Dashed lines represent the best-fit combination of standards reported in Table 3 for soil samples.

View larger version (43K): [in a new window]   Fig. 6. Zinc K-XANES (X-ray absorption near edge structure) spectra for selected soil samples used in column flow experiments or collected in the vicinity of column samples (Bo1*, At5*), and selected standards used in linear combination fitting. Dashed lines represent the best-fit combination of standards reported in Table 3 for soil samples.

View larger version (24K): [in a new window]   Fig. 7. The relationship between acid-digestable soil Cu or Zn concentrations and dissolved Cu (•) and Zn () at pH 4.0 in column effluent samples.