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

摘要

A flotation spectrophocometric 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 x 10~5 l mol~(-1) cm~(-1) at 531 nm. Beer's law is obeyed over the concentration range of 5.0 x 10~(-8)-1.25 x 10~(-6) mol 1~(-1). The proposed method is sensitive and accuracy and can be applied satisfactorily to the determination of germanium in vegetables.