Abstract:Determination of trace aluminium has been investigated in this paper.First,the Zr,Ti,Fe and Hf were and separated from aluminium in a sulfuric acid medium.Then,the complex of aluminium-N-bonzoyl-N-phenylhydroxylamine was extracted in the resultant aqueous phase by benzene at pH 8.5,and aluminium was extracted in the resulting organic phase by dilute hydrochloric acid.Lastly,aluminium content was determined by the chromazurol S photometric method in the pHrange of 5.5 to 6.the method can be used for the determination of traee aluminium in the range of 0.0025%to 0.035% in Zirconium and zirconium alloys with satisfactory results.