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Changes in Phosphorus Adsorption Associated with Aging of Aluminum Hydroxide Suspensions¹

ABSTRACT

Phosphorus adsorption by "pure" Al-OH suspensions was examined as a function of pH of Al-OH precipitation, length of incubation, and ionic strength. Changes in P adsorption were measured through use of Langmuir isotherms after 30, 180, and 365 d of incubation. Physical characterization of changes in the Al-OH suspensions was accomplished through x-ray diffraction and scanning electron microscopy. Aging of Al-OH suspensions reduced their capacity for P adsorption, and while Al-OH precipitated at pH 5.5 initially adsorbed more P than that precipitated at pH 7.0, the difference became insignificant within 90 d. Reducing the ionic strength of the Al-OH suspensions by dialysis produced gibbsite and caused a decrease in the P adsorption maxima (Langmuir b value), further evidence that the polymerization/crystallization process is an important control of Al-OH reactivity for P.

¹ Journal Article no. 10631, Michigan Agric. Exp. Stn., East Lansing, MI 48824.

² Assistant Professor, Dep. of Plant Science, Univ. of Delaware (formerly Graduate Research Assistant), and Professor, Dep. of Crop and Soil Sciences, Michigan State Univ., respectively.

Received for publication November 1, 1982. Accepted for publication April 28, 1983.

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