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Adsorption of Free Lead (Pb²⁺) by Pedogenic Oxides, Ferrihydrite, and Leaf Compost

^a QSAR Risk Assessment Service Inc., 360 St-Jacques W., Suite 800, Montréal, QC, Canada H1Y 2P5
^b Dep. of Soil, Crop, and Atmospheric Sci,, Bradfield Hall, Cornell Univ., Ithaca, NY 14853 USA
^c Dep. of Natural Resources Sci., McGill Univ., Macdonald Campus, Ste-Anne-de-Bellevue, QC, Canada H9X 3V9

View larger version (73K): [in a new window]   Fig. 1 The free Pb2+ activity estimated from the anodic stripping voltammetry–labile measurements is represented as a function of solution pH and total metal loading (log10) for the different adsorbents. Ferrihydrite represents the synthesized ferrihydrite, SMS-1 represents the most amorphous pedogenic oxide, SMS-2 represents the most crystalline pedogenic oxide, and Leaf represents the leaf compost. The graph surfaces are obtained by distance-weighted least square smoothing, noting that the regions outside the data are extrapolated (Wilkinson, 1992)

View larger version (19K): [in a new window]   Fig. 2 The calculated pH-dependent free Pb2+ activity [shown as negative M log10(Pb2+)] is represented for three arbitrary metal loadings (20, 200, and 2000 mg Pb kg-1). The lines are obtained from the regressions reported in Table 2. They do not represent actual measurements; they simply reflect the shape of the regressions. The triangles () represents ferrihydrite; the circles (•) represents the most amorphous pedogenic oxide (SMS-1); the asterisks (*) represents the most crystalline pedogenic oxide (SMS-2); the squares () represents the leaf compost; and the lozenges () represent data obtained from an independent study of field-collected Pb-contaminated soils (Sauvé et al., 1997a). The inserts use the same x–y scales to compare the pH-dependent free Pb2+ relationship calculated using a model similar to Eq. [1] and Table 2 but based on different arbitrary surface coverage levels of 0.5, 5, and 50 µg Pb m-2 (regression data not presented)