Abstract
To an acid solution containing beryllium was added 1 ml of 5% EDTA solution for less than 3 mg of Al or 5 ml for 314 mg of Al, and pH was adjusted to 3.54.5 with 0.25 M sodium acetate solution. Its pH was then adjusted to 5.1 with 0.25 M sodium acetate solution, and 0.6 ml of 0.25% Chromazurol S solution and 2 ml of 0.5% Zephiramine solution were added. It was diluted to 25 ml with water and allowed to stand for 30 min. The absorbance was measured at 610 mμ against a reagent blank. From 0.05 to 2μg of beryllium was determined by this method in the presence of up to 14 mg of aluminum. In the presence of more than 3 mg of aluminum, the calibration curves were prepared for solutions containing the same amount of aluminum.
