Two new extraction methods-the silylation of the organic constituents of soil with trimethylchlorosilane (TMCS) and triethylchlorosilane (TECS) in the presence of dimethylformamide (DMF)-have been developed for mobilization of the organic complexes of Ca, Fe, Cu and Pu which might exist in some soils. By silylation of the carboxylic, phenolic, alcoholic and perhaps the amino moieties of humic and fulvic acids (the principal organic constituents of soils) the authors have modified the solubility of the humic substances with perhaps a minimum perturbation of the humate-metal ion complexes. These new extraction procedures, which use a non-aqueous solvent, have been compared with a variety of aqueous extraction procedures (sodium hydroxide, 1 m potassium chloride and diethylenetriaminepentaacetic acid solution) and found to be superior in the release of the elements from soils.
Bibliographical noteFunding Information:
Gy. Szabow asthe gratefurl ecipienot f a trainingfe llowshipt,h et enureo f which was held at the NationalR adiologicaPl rotectionB oard,from the InternationaAlt omicE nergyA gency.T his work wass upporteidn part by the Commissiono f the EuropeanC ommunityu, nderc ontractB IG-B-048-UK.