Analytical applications of ternary complexes-IV Titration of macro- and micro-amounts of cyanide.
The use of a 1,10-phenanthroline/Bromopyrogallol Red indicator system is proposed for the visual and photometric titration of cyanide with silver nitrate in the range 10(-1)-10(-4)M and 10(-4)-10(-5)M respectively. Sharp, well-defined end-points are observed and the titration succeeds at low concentrations where the Liebig-Dénigès method is inapplicable. The results obtained agree well with those of the conventional method. EDTA may be used as a mass-masking agent for most cations.
Dagnall
R M
RM
Chemistry Department, Imperial College of Science and Technology, London S.W.7, U.K.
El-Ghamry
M T
MT
West
T S
TS