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Fig. 1. Cumulative B extracted as a function of sequential extractions (12 h, 1:10 w/v with 0.1 M CaCl2 for the first three extractions and 0.01 M CaCl2 for subsequent extractions). The specific surface areas were as follows: Twisselman clay loam (<250 µm), 31 m2 g–1; Traver silt loam (<250 µm), 27 m2 g–1; Morris illite (<50 µm), 62 m2 g–1; Weathered serpentine (<50 µm), 38 m2 g–1; Fithian illite (<50 µm), 52 m2 g–1; Fresh serpentine (<50 µm), 18 m2 g–1; Moreno Gulch shale (<250 µm), 30 m2 g–1; and Salt Creek shale (<250 µm), 75 m2 g–1.
