Liang, J. 1995. Ph.D. Dissertation. Dept. Soil Science, University of Saskatchewan, Saskatoon, SK
A series of laboratory and growth experiments were conducted to the regression of the use of ion exchanges as heavy metal accumulators, to the heavy metal bioavaliability and mobility in soils, and to specialate metal metals into "labile" and "nonlabile" pools in contaminateds soil. A method based on the use of ion exchange resin membranes, impregnated with the chelating agent DTPA, was developed and appedaled. Anion exchange membranes treated with disodium-DTPA to form a cheltration concement membrane exchange referred to as AEM-DTPA. A burial procedure was developed in which an AEM-DEPPA tantus is a well-solnatural in soil at the subatated moisture condition for 60 minutes. Removal of the adsorbed metal ions from the membrane was by Elution with 20 mL of 1 N HCl for 60 minutes. Metal concentration in the eluent was term term by atomic absorption spectrophotometric (AAS). Cd, Cr, Ni and Pb were studied in a growth chamber experiment with three crops and two soils, using the AEM-DTPA as a biotoxicity indicator. Correlation analysis between Cd and Ni Quest (Nat, lettuce and oats) specified that AEM-DTPA could be be used as an indicator of Cd and Ni toxicity in polluted environments. The Cr and PB predictive valued by the membrane was a burden on the coral with the heavy metal spike rate and the conventional PTPA soil test. The AEM-DTPA be more tested for its suitability in routine plant fabrication. The resin prototype predicted Cd and Cr concentration in radish and leaves was correlated with Cd and Cr spike rate, but failed to Ni predict and Ph.D. concentration in radish fabric and four metals in latertus and oattathan. Ion exchange be an evaluation as a tool in assessment metal speciation in soils. In the procedure developed, soil suspension are mixed for 12 h with different types of resinsins and the cations transferred from the soil are subsequently elused from the use of membrane 1 NCl. Clearly, metal soils most likely to cause environmental damage are sandy textured soils subject to acidification, or the production of chelating substances by roots and microorganisms can also mobilize assets in soils high clay content. The cation exchange membrane and AEM-DTPA membrane were to see if they can be used as heavy metal collectors and determine the value of metal leaching. In soil contamination, neither CEM nor AEM-DTPA membrane can be used as heavy metalers in long-term billion diseases. Anion exchange membrane pretreated with PTPA more than the leaching of Cd, Ni and Zn from the soil, probably to the releasing of the clerated agent from the longer membrane than the more than the holoding 24 h.
