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Right arrow Soil Chemistry

Evaluation of Soil Surface Charge Using the Back-Titration Technique

Ying Ge and William Hendershot*

Dep. of Natural Resource Sciences, Macdonald Campus of McGill Univ., 21,111 Lakeshore Road, Ste-Anne-de-Bellevue, QC, Canada H9X 3V9



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Fig. 1. Variable surface charge of three organic soils from Sudbury (SUD 12), Rouyn-Noranda (RN 7), and Valleyfield (VAL 4) ({square}: measured by the back-titration; solid line: predicted by the non-ideal competitive adsorption [NICA]–Donnan model).

 


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Fig. 2. Variable Surface charge of three mineral soils from Sudbury (SUD 1), Rouyn-Noranda (RN 1), and Valleyfield (VAL 1) ({square}: measured by the back-titration; solid line: predicted by the non-ideal competitive adsorption [NICA]–Donnan model).

 


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Fig. 3. Type 1 maximum surface charge (Qmax1) as a function of soil (a) organic C (Org. C) and (b) cation-exchange capacity (CEC).

 


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Fig. 4. Type 2 maximum surface charge (Qmax2) as a function of soil (a) organic C (Org. C) and (b) cation-exchange capacity (CEC).

 





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