extraction indicator
1.Acatalytic procedurefor the determination of ultratrace aluminum had been proposed based on Al3 + catalyzed H2 O2 - Gallocyanine indicator reaction in hexamine - hydrochloric acid buffer. The calibration graphislinearfor0 ～200ng/mLAl3 + , andthe detectionlimitis1-2ng/ mL . Theinterferences of Fe3 + and Cu2 + was effectively eliminated by extraction with cupferron-chloroform and dithizone- carbon tetrachloride, and that of Cr( Ⅵ)by reducing to Cr( Ⅲ), respectively.
