Ammonium released from added ammonium in surface soil clays
2002
Chen, H. J. | Juang, T. C. | Wang, M. K. | Tan, C. C.
The nature of ammonium released from 2:1 layer silicates with varying degrees of tetrahedral/octahedral isomorphous substitution has not yet been defined. This study investigated the influence of 2:1 clay charge caused by octahedral or tetrahedral sheet substitution on the amount of ammonium released. Twelve surface soil (0–30 cm) clays in Taiwan were examined. Deferrated clays with added ammonium fixed had −0.8 volts (V) current applied for 30 min to release ammonium from soil clay suspensions. The mean value of total ammonium released ranged from 0.72 to 3.66 cmol kg. The percent of total ammonium released with respect to total ammonium fixed ranged from 5.81 to 83.22%. The added ammonium fixed plus the tetrahedral sheet contribution to ammonium fixed showed a correlation coefficient (r) of 0.797 with the amount of ammonium released.
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