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Influence of Neutral Salts on the Phosphate Ion Concentration in Soil Solution
Author(s) -
Clark J. S.,
Peech Michael
Publication year - 1960
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1960.03615995002400050013x
Subject(s) - chemistry , phosphate , ion , electrolyte , solubility equilibrium , solubility , inorganic chemistry , organic chemistry , electrode
Certain cation activity ratios and ion activity products involving Ca ++ , H + , K + and H 2 PO 4 ‐ were found to remain constant in soil and clay suspensions as the electrolyte concentration was increased. The observed constancy of the cation activity ratios could be attributed to the fact that the concentrations of the cations on the surface of the soil particles remained constant under the conditions of the experiments. The constancy of the ion activity products involving Ca ++ , H + , K + , and the H 2 PO 4 ‐ ion could be explained either by assuming that the phosphate ion is coadsorbed with exchangeable cations on the soil particles or by postulating the existence in the soil of any crystalline phosphate compound having a definite solubility product.