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The gel was moistoned with mthyl-ace-tate, BP 57°, and the resulting extract was drawn into the flask under suction. The operation was repeated three times. The gel was finally washed with 0.1 M NaH2P04 - Na2HP04 buffer solution. The flask was filled with buffer to the mark. The solution thus obtained, pH 6.68, was filtered through a fine porosity

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An improved and rapid process for purifying a silica hydrogel of soluble contaminants which comprises reducing the hydrogel to a controlled particle size range and thereafter treating the sized hydrogel in a continuous three-step operation. Treatment involves first dewatering a hydrogel slurry, washing the resulting hydrogel with acidified water, followed by washing with ammoniated water.

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