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Solution Aluminum Anomalies Resulting from Various Filtering Materials¹

ABSTRACT

Commercially available filter papers and membranes of varying composition were examined for their effect on solution Al. This investigation was conducted in order to assess the impact of filter materials on environmental water samples and solubility studies. Many of the filter materials in equilibrium with unneutralized and partially neutralized AlCl₃ removed a significant portion of Al from solution (0-87% of added Al). The loss of solution Al resulted from the negative charge and/or residual anion content of the filter material. Filter discs that resulted in large losses of solution Al generally had high levels of F^-, PO^3-₄, and/or SO^2-₄ and had an appreciable cation exchange capacity. Removal of residual salts from uncharged membrane filters essentially eliminated any loss of Al from solution. Potentiometric titration analyses of the equilibrium Al solutions indicated marked titration curve distortions for several filter materials, which was related to their residual contaminants.

¹ Contribution from the Dep. of Agronomy, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061. This research was funded in part by U.S. Dep. of Energy under contract number DE-ASO5-83ER60179.

² Graduate Research Assistant, Professor, and Post-doctoral Research Associate, respectively.

Received for publication October 10, 1985.

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