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The Effect of Field Strength on the quantity of K desorbed from Soils by Electro‐Ultrafiltration
Author(s) -
Grimme H.
Publication year - 1980
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19801430113
Subject(s) - desorption , field strength , chemistry , ultrafiltration (renal) , fractionation , extraction (chemistry) , soil water , analytical chemistry (journal) , field (mathematics) , soil science , environmental chemistry , adsorption , chromatography , environmental science , mathematics , physics , organic chemistry , quantum mechanics , pure mathematics , magnetic field
Only halftime (a measure of desorption rate) was found to vary with field strength. The quantities which were actually desorbed within a given time were, of course, also dependant on field strength because of the change of desorption rate with field strength. The theoretical desorption maximum, however, as obtained from extrapolating the cumulative desorption curve, remained unaffected. The desorption maximum was always equal or close to the exchangeable K content. No fractionation of exchangeable K was possible by applying different field strengths. The sum of desorbed + residual exchangeable K approximated closely the exchangeable K content. Thus there was no evidence of a significant release of non‐exchangeable K. It was concluded that there is no corrosive attack on the clay mineral structure during the EUF extraction procedure.