Determinación espectrofotométrica y espectrofluorimétrica de oro por un proceso de extracción. Determinación de oro en plomos

Authors

  • C. Sánchez-Pedreño
  • Miguel Hernández Córdoba
  • I. López García

Abstract

Tetrachloroauric acid forms with phenosafranine (C.I.50200) an ionpair which is extractable in butyl acetate. As a consequence new spectrophotometric éind spectrofluorimetric methods for gold determination are developed. With 5 ml of organic layer and 25 ml for the aqueous phase, 0,3 M in hydrochloric acid, 2.0 M in sodium chloride and 10-4 M in phenosafranine, Beer's law is obeyed at 527 nm in the range 1,25-37,5 micrograms of gold. The sensitivity can be enhaced measuring the fluorescence i,„xc=521, Xem 547 nm) of the organic phase diluted five times with acetone and even 0,125 µg of gold can be determined. The methods have been applied to the determination of gold (2-10 p.p.m.) in lead with good analytical results.

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