Abstract
The reaction between EDDHA and Fe in Al is very sensitive in the pH range of 2-8. Once formed, this red solution is quite stable and its absorbance value is unchangeable over 8 hours.
EDDHA was thus tried to use for the determination of Fe in Al and its alloys and showed the successful results.
The colored Fe-EDDHA chelate compound has a maximum absorption at 470mμ-480mμ.
Through this method, Fe in Al and its alloys is determined in shorter time with excellent accuracy in the co-existance with Mg, Zn, Cr, Mn and Si. In this case, large amount of Cu and or Ti, which interfer the determation, may be removed by electrolysis or masked by EDTA.
Thus, Fe in Al and its alloys can be determined with standard deviation of 0.02%.
