TRACE ANALYSIS OF CYANIDE BY ION-SELECTIVE ELECTRODE INDICATOR TECHNIQUE

摘要

Due to the toxicity of cyanide, its analysis in water is important. The use of ion-selective electrodes for its deter¬mination was studied. The known addition method using a silver sulfide membrane electrode was studied. This involved using a silver indicator solution to deter¬mine the cyanide content of a sample. Known amounts of a standard cyanide solu¬tion were added and the potentials noted. The results were plotted and the original concentration of cyanide extrapolated.nThe results of the experiment indi¬cated the method to be practical for ana¬lysis of industrial waste waters, even in the presence of metal ions. The metal ions were masked using an EDTA solution while possible sulfides were precipitated out using a Pb(NO3) solution. The method was tested on four actual samples and the results indicated the applicability of the method.