SOLUTION ALUMINUM ANOMALIES RESULTING FROM VARIOUS FILTERING MATERIALS

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 environment water samples and solubility studies. The loss of solution Al resulted from the negative charge and/or residual anion content of the filter material. 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.