Determination of cyanide as tetracyanonickelate(II) by flow injection and spectrophotometric detection

Abstract

A two channel gas diffusion flow injection (GDFI) system was utilized successfully for the quantitative determination of cyanide. The analytical procedure is based on the complexation reaction in the acceptor stream between nickel ions in ammoniacal solution and the cyanide ions formed as a result of the diffusion of hydrogen cyanide from the acidified donor stream where the sample is injected. The design and the chemical parameters of the GDFI system were optimized with respect to sensitivity and sampling rate. The interference effect of a number of frequently encountered chemical species on the analytical determination was investigated in real samples and methods for their removal were dev..