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KAWAI KANJI
Soil Science: March 1980
ORIGINAL ARTICLE: PDF Only
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ABSTRACTThe amounts of phosphorus adsorbed by seven Andosols from a 215 mM phosphorus solution of pH 7, at a soil:solution ratio of 1:30, at 30°C, over a 24-hour period, closely agreed with the adsorption maximum determined from the Langmuir adsorption isotherm.The molar ratios of adsorbed phosphorus to amorphous aluminum at pH 7 ranged from 0.25 to 0.42 and, at pH 4.5, ranged from 0.39 to 0.47. That the molar ratios of the precipitates are smaller than 1 seems to signify that phosphate was isoelectrically precipitated with positively charged aluminum. The amounts of adsorbed phosphorus were highly correlated with the amounts of amorphous aluminum (r = 0.944 at pH 7, r = 0.973 at pH 4.5) in the Andosols studied.

The amounts of phosphorus adsorbed by seven Andosols from a 215 mM phosphorus solution of pH 7, at a soil:solution ratio of 1:30, at 30°C, over a 24-hour period, closely agreed with the adsorption maximum determined from the Langmuir adsorption isotherm.

The molar ratios of adsorbed phosphorus to amorphous aluminum at pH 7 ranged from 0.25 to 0.42 and, at pH 4.5, ranged from 0.39 to 0.47. That the molar ratios of the precipitates are smaller than 1 seems to signify that phosphate was isoelectrically precipitated with positively charged aluminum. The amounts of adsorbed phosphorus were highly correlated with the amounts of amorphous aluminum (r = 0.944 at pH 7, r = 0.973 at pH 4.5) in the Andosols studied.

© Williams & Wilkins 1980. All Rights Reserved.