The method of measuring exchangeable cations as an approximation for cation exchange capacity was examined using a cow manure and green waste biochar. Both biochars were pre-treated by shaking with water over a range of times. Leachates were analysed, and the pre-treated biochars were then treated with two solutions (0.1M BaCl2 or 0.1M CsCl) to measure ion adsorption. Pre-treatment shaking had a significant effect on ion adsorption for both biochars. Ion adsorption for the green waste biochar was significantly increased with pre-treatment shaking, whereas it decreased for the cow manure biochar. Compulsive exchange of cations to determine the ability of a substrate to retain positively charged ions on its surface may not be an appropriate method for biochar.
|Title of host publication||19th proceedings|
|Subtitle of host publication||Soil Solutions for a Changing World|
|Place of Publication||Crawley|
|Publisher||International Union of Soil Sciences|
|Number of pages||4|
|Publication status||Published - 2010|
|Event||World Congress of Soil Science - Brisbane, Australia, Australia|
Duration: 01 Aug 2010 → 06 Aug 2010
|Conference||World Congress of Soil Science|
|Period||01/08/10 → 06/08/10|
Waters, D., Condon, J., Van Zwieten, L., & Moroni, J. (2010). Biochar-Ion Interactions: An Investigation of Biochar charge and its effect on ion retention. In R. Gilkes (Ed.), 19th proceedings: Soil Solutions for a Changing World (pp. 20-23). International Union of Soil Sciences.