TY - JOUR
T1 - Effects of ionic strength, calcium, and citrate on orthophosphate solubility in an acidic, montmorillonitic soil.
AU - Traina, S. J.
AU - Sposito, G.
AU - Hesterberg, D.
AU - Kafkafi, U.
PY - 1986
Y1 - 1986
N2 - A recent study by the authors of the effects of pH and organic acids on residual orthophosphate solubility in an acidic, montmorillonitic soil was extended to include variations of ionic strength (NaCl background) and Ca2+ concentration at fixed ionic strength. At ionic strengths between 20 and 100 mol/m3 (NaCl) and Ca2+ concentrations between 1 and 5 mol/m3 at 20 mol/m3 ionic strength (NaCl background), additions of citric acid at low concentrations (<0.1 mol/m3) reduced orthophosphate solubility. The solubility then gradually returned to its value in the absence of added organic acid as the citric acid concentration was increased to 0.6 mol/m3. The only significant effect of increasing the ionic strength or the Ca2+ concentration was to decrease orthophosphate solubility at any level of citric acid addition. Orthophosphate-citric acid interactions in the soil were influenced only quantitatively, probably through the displacement of exchangeable Al(III) by Na+ and/or Ca2+, by increasing the concentration of these two metal cations in the soil solution. (Authors' abstract) -C.N.
AB - A recent study by the authors of the effects of pH and organic acids on residual orthophosphate solubility in an acidic, montmorillonitic soil was extended to include variations of ionic strength (NaCl background) and Ca2+ concentration at fixed ionic strength. At ionic strengths between 20 and 100 mol/m3 (NaCl) and Ca2+ concentrations between 1 and 5 mol/m3 at 20 mol/m3 ionic strength (NaCl background), additions of citric acid at low concentrations (<0.1 mol/m3) reduced orthophosphate solubility. The solubility then gradually returned to its value in the absence of added organic acid as the citric acid concentration was increased to 0.6 mol/m3. The only significant effect of increasing the ionic strength or the Ca2+ concentration was to decrease orthophosphate solubility at any level of citric acid addition. Orthophosphate-citric acid interactions in the soil were influenced only quantitatively, probably through the displacement of exchangeable Al(III) by Na+ and/or Ca2+, by increasing the concentration of these two metal cations in the soil solution. (Authors' abstract) -C.N.
UR - http://www.scopus.com/inward/record.url?scp=0022927570&partnerID=8YFLogxK
U2 - 10.2136/sssaj1986.03615995005000030016x
DO - 10.2136/sssaj1986.03615995005000030016x
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AN - SCOPUS:0022927570
SN - 0361-5995
VL - 50
SP - 623
EP - 627
JO - Soil Science Society of America Journal
JF - Soil Science Society of America Journal
IS - 3
ER -