Abstract
A method for the spectrophotometric determination of beryllium with Arsenazo I in aluminum-, magnesium-, and copper-base alloys was presented. The sample was decomposed with either hydrochloric acid or nitric acid, and made up to the volume. After an aliquot containing 550μg of beryllium was neutralized with sodium hydroxide to an adequate pH, 10 ml of 0.1% Arsenazo I solution was added and the pH was adjusted to 12.5 with sodium hydroxide or hydrochloric acid. It was diluted to 100 ml, and the absorbance at 580 mμ gave the amount of beryllium referred to its calibration curve.
The presence of 100 mg of aluminum gave no harm. Magnesium, etc., were masked with EDTA, and copper, etc., were masked with potassium cyanide. 1.00.01% of beryllium in aluminum-, magnesium-, and copper-base alloys was directly determined without separation of the alloying elements. The beryllium-Arsenazo I complex obeyed Beer's law for 00.5ppm of beryllium, and the sensitivity of the determination was 0.05 ppm for the final volume.
