Vortex-assisted liquid-liquid microextraction and indirect spectrophotometric determination of chromium(vi).

A novel, simple, sensitive and selective method for the indirect spectrophotometric determination of chromium(vi) was developed on the basis of vortex-assisted liquid-liquid microextraction (VALLME) of an ion association pair formed between the triiodide anion (I ) and cationic dye Astrazone Brilliant Red 4G (ABR). The indirect spectrophotometric determination of chromium(vi) was based on the redox-reaction of Cr(vi) with iodide and formed I . The triiodide anion was determined spectrophotometrically at 530 nm following VALLME of an ion association pair with ABR.