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Negative charge — pH dependence of organic matter of forest soil under influence of liming as determined from titration curves
Author(s) -
Wilczynski A. Waldemar,
Renger Manfred,
Józefaciuk G.,
Hajnos M.
Publication year - 1993
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.19931560313
Subject(s) - titration , chemistry , titration curve , organic matter , base (topology) , soil ph , inorganic chemistry , charge (physics) , soil water , analytical chemistry (journal) , environmental chemistry , soil science , geology , organic chemistry , mathematical analysis , physics , mathematics , quantum mechanics
The dependences between negative charge and pH for organic matter of limed and unlimed profiles of sandy acidic forest soils were determined on the base of ion exchange and titration curves measurements. Subtracting the titration curves of the supernatant from the titration curves of the respective suspensions the quantities of base consumed by solid phases were determined. They were interpreted in terms of negative charge after corrections with the quantities of initial exchangeable basic cations and exchangeable hydrogen. For investigated organic material the charge increased slowly in acidic pH region and much faster in alkaline pH region. The zones of the fast increase of charge occured at higher pH's for deeper horizons, enriched with fulvic acids. The observed changes of organic matter charge due to liming were related to the increase of fulvic to humic acids ratio. The negative charges of organic matter in limed and unlimed profiles estimated for high pH were better correlated with fulvic to humic acids ratio than when estimated for lower pH levels.