Analytical applications of ternary complexes-IV Titration of macro- and micro-amounts of cyanide |
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| Authors: | Dagnall R M El-Ghamry M T West T S |
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| Institution: | Chemistry Department, Imperial College of Science and Technology, London S.W.7, U.K. |
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| Abstract: | 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 10−1–10−4M and 10−4–10−5M 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. |
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