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Sorption capacity of phosphate in mineral soils i. estimation of sorption capacity by means of sorption isotherms



Sorption capacity of phosphate in mineral soils i. estimation of sorption capacity by means of sorption isotherms



Journal of Agricultural Science in Finland 62(1): 1-8



The sorption capacity of phosphate in seven soil samples (clay content 1-70%, organic carbon content 0.8-10.7%, soil pH 4.2-5.3, oxalate-extractable Al 11-222 and Fe 11-202 mmol/kg soil) was studied by means of sorption isotherms. The soils were equilibrated, for two to seven days at +5 and +20.degree. C, with solutions containing phosphate 0-10 mmol/l (0-200 mmol/kg soil) at a constant ionic strength of 0.01. Prolongation of the reaction time increased the sorption of phosphate only partially. The rise in temperature, from +5 to +20.degree. C, increased the sorption from higher phosphate concentrations. At +20.degree. C, the sorption curves of three soils showed a sorption maximum of 4, 19 and 34 mmol/kg soil. The sorption data of six soils was in accordance with the Langmuir equation; the sorption maximum ranged from 15 to 119 mmol/kg soil, and were of the same magnitude as the maximums determined experimentally.

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