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Effect of Biosolids Processing on Lead Bioavailability in an Urban Soil

^a College of Forest Resources, Box 352100, Univ. of Washington, Seattle, WA 98195
^b Animal Manure and By-Products Laboratory, USDA ARS ARNI, Beltsville, MD 20705
^c Diet and Human Performance Laboratory, USDA ARS HNRS, Beltsville, MD 20705

View larger version (82K): [in a new window]   Fig. 1. Partitioning of soil Pb by the Berti and Cunningham procedure (1996) after soils had been amended and incubated for 30 d. Treatments were as follows: 1, control soil; 2, compost; 3, high Fe compost; 4, high Fe compost + lime; 5, compost + lime; 6, raw biosolids; 7, pellet biosolids; 8, ashed biosolids; 9, N VIRO biosolids.

View larger version (25K): [in a new window]   Fig. 2. Correlation in percent reduction in bioavailability of Pb in treated soils as compared with control soil between bone Pb in weanling rats and two in vitro procedures, one conducted at two pH levels. In both rapid procedures, one outlier point (N VIRO) soil has been deleted from the dataset.