ABSTRACT
A spectrophotometric method for determination of the tetrafluoroborate anion with ferroin is described. The ferroin tetrafluoroborate is selectively extracted in the presence of excess of ferroin into n-butyronitrile, and the absorbance of the organic extract is measured at 520 mmicro. Beer's law is followed over a wide range of tetrafluoroborate concentrations when a single extraction procedure is used. Exhaustive extractions indicate that 74 % of the tetrafluoroborate is removed in a single extraction.
ABSTRACT
A spectrophotometric method for the hexafluoroarsenate anion is described. The determination involves selective extraction of the tris(1,10-phenanthroline)iron(II) salt of the anion into n-butyronitrile, followed by measurement of the absorbance of the organic layer. The extracts give good Beer's law plots over a wide range of concentrations and more than 98% of the hexafluoroarsenate is removed in a single extraction. Interference studies were made on a number of anions.