Sensitive and selective extraction method used for separation, preconcentration and
spectrophotometric determination of Cr(VI) as Cr2O7
= and Mn(VII) as MnO4
- from HCl media by used
Janus green B after formation ion pair association complex, studies the optimum condition for extraction
demonstrated 0.1M and 0.05M of HCl suitable for extraction efficiency of Cr(VI) and Mn(VII)
respectively, in presence 50μg Mn(VII) or 20μg of Cr(VI). with 0.8mL 1% TritonX-100 for extraction ion
pair association of Cr(VI) as well as 0.5mL for Mn(VII) and 95°C suitable for formation CPL and
extraction ion pair complex for both metal ions ,with 15 min. of heating time for both metal ions. Then
study effect of interferences and electrolyte presence. This method applied for spectrophotometric
determination of Cr(VI) and Mn(VII) in different samples. The wave length for maximum absorbance of
ion pair complex extracted was λmax=560 nm for Mn(VII) and 603nm for Cr(VI) complexes.
أ.د.شوكت كاظم جواد | Prof. Dr.Shawket Kadhim Jawad | 4679