Flotation-spectrophotometric determination of trace of germanium with isochromatic dye ion-pairs formed by rhodamine 6G and tetrabromofluorescein

Abstract A flotation spectrophotometric method for the determination of germanium with isochromatic dye ion-pairs is described. The molar ratio of germanium to rhodamine 6G to tetrabromofluorescein is 1:5:5. The apparent molar absorptivity is 5.8 × 10 5 l mol −1 cm −1 at 531 nm. Beer's law is obeyed over the concentration range of 5.0 × 10 −8 −1.25 × 10 −6 mol l −1 . The proposed method is sensitive and accuracy and can be applied satisfactorily to the determination of germanium in vegetables.