Carminic acid as a reagent for the spectrofluorimetric determination of molybdenum and tungsten-I Development of procedures.
Carminic acid forms red fluorescent complexes with molybdenum(VI) and tungsten(VI) which provide spectrofluorimetric methods for the determination of these metals in the range 0.1-0.9 ppm and 0.4-0.36 ppm at pH 5.2 and 4.6 respectively. The optimum conditions for the analytical procedures have been established, and the effects of a wide range of cations and anions have been investigated. The reagent forms 1:1 complexes with both molybdenum and tungsten, and the conditional stability constants have been evaluated.
Kirkbright
G F
GF
Department of Chemistry, Imperial College, London S.W.7 UK.
West
T S
TS
Woodward
C
C