DETERMINATION OF CYANIDE IN MICROSAMPLES BY MEANS OF CAPILLARY-FLOW INJECTION-ANALYSIS WITH AMPEROMETRIC DETECTION

A new approach for determining cyanide in microsamples is described. T he method is based on capillary flow injection analysis (CFIA) with am perometric detection. The sensing electrode is a silver-plated microdi sk electrode, where cyanide can react under formation of a dicyanoarge ntate complex. A remarkably low mass detection limit of 231 fmol cyani de is obtained for an injection volume of 60 nl. The sample throughput of the CFIA-arrangement is comparable with a conventional sized FIA-s ystem. A practical application is given by analyzing the cyanide (amyg dalin) concentration in apple kernels.