Vergleich dreier komplexometrischer aluminiumbestimmungsmethoden

The complexometric methods for determination of aluminium of Wännien and Ringbom, P?ibil and Sajo are compared. That of P?ibil has a relative error of — 0.3% and a variance of 0.7% in the region of 2.5 mg Al and is preferable. The salt error for sodium acetate, urotropin, sodium chloride, nitrate and sulfate has been studied for the titration with xylenol orange as indicator (P?ibil). The rate of formation of the aluminium complex in strongly acidic medium has been studied in relation to the boiling time.