Abstract
AMMONIUM in clay minerals that is not replaceable by K+ has been defined as fixed NH4 +. This fixed NH4 + is replaceable to some extent by Na+ and H+, but the amount that can be replaced depends upon the extraction method used. Recent work1,2 has shown that small amounts of K+ or NH4 + in the extracting solution block the replacement of fixed NH4 +. Thus, the efficiency of an equilibrium extraction of fixed NH4 + is decreased by the accumulation of displaced NH4 + in the extracting solution2. If a clay mineral containing fixed NH4 + were equilibrated with a cation exchange resin instead of a soluble salt, there would be less soluble K+ or NH4 + in the system. A comparison of these extraction methods was made, therefore, to determine if there was also less blocking and thus more fixed NH4 + removed in a resin extraction.
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References
Hanway, J. J., et al., Soil Sci. Soc. Amer. Proc., 21, 29 (1957).
Scott, A. D., et al., Soil Sci. Soc. Amer. Proc., 22, 388 (1958).
Hanway, J. J., Iowa State Coll. J. Sci., 30, 374 (1956).
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SCOTT, A., EDWARDS, A. & BREMNER, J. Removal of Fixed Ammonium from Clay Minerals by Cation Exchange Resins. Nature 185, 792 (1960). https://doi.org/10.1038/185792a0
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DOI: https://doi.org/10.1038/185792a0
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