EXTRACTABILITY OF ADDED LEAD IN SOILS USING LEAD-210

1 February 1976

journal article
research article
Published by Canadian Science Publishing in Canadian Journal of Soil Science

Vol. 56 (1) , 37-42
https://doi.org/10.4141/cjss76-005

Abstract

Four soils of different physical and chemical characteristics were treated with 10 ppm Pb in the form of PbCl2 labeled with Pb 210 (2.5 mCi/g 207Pb) and subjected to a 7 wk incubation period. The extractability of the added Pb was assessed using 12 extractants. Almost complete recovery (93-98%) of the applied Pb was obtained with 6 N HNO3. Large amounts of the applied Pb (.simeq. 80%) could be extracted by chelating agents (DTPA [diethylenetriaminepentaacetic acid] and EDTA). Relatively small amounts were exchangeable with 0.5 M BaCl2 (0.1-4%) and N ammonium acetate (1-11%). Proportionally slightly higher amounts were extracted with 2.5% acetic acid and 0.5 M NaHCO3. Only traces could be found in the 0.05 M CaCl2 extract.

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