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Potential use of Rare Earth Oxides as Tracers for Soil Erosion and Aggregation Studies

^a USDA-ARS, Grazinglands Research Lab., 7207 W. Cheyenne St., El Reno, OK 73036
^b Dep. of Chemistry, Purdue Univ., West Lafayette, IN 47907
^c USDA-ARS, National Soil Erosion Research Lab., Purdue Univ., West Lafayette, IN 47907

View larger version (17K): [in a new window]   Fig. 1. Cumulative (A) and particle size (B) distributions of five rare earth oxide powders.

View larger version (27K): [in a new window]   Fig. 2. Aggregate size distribution of the leached rare earth element (REE)-tagged soil after 25 min of wet sieving.

View larger version (64K): [in a new window]   Fig. 3. Total extractable rare earth element (REE) concentrations of the leached REE-tagged soil (whole) and individual aggregate size groups after wet-sieving.