锆及锆合金中微量铝的测定

本文介绍在硫酸介质中,先用钽试剂-氯仿萃取分离除去锆以及钛、铁、铪等;再在pH=8.5左右,用苯萃取铝-钽试剂配合物,用稀盐酸反萃取;最后在pH=5.5—6时用铬天青S比色以测定铝的方法,确定了其测定条件。本方法准确性好,灵敏度高,测定范围为0.0025%—0.035%。

Determination of Trace Aluminium in Zirconium and Zirconium Alloys

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.