Sequential flow-injection determination of cyanide and weak metal—cyanide complexes with flow-through heterogeneous membrane electrodes |
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| Authors: | E Figuerola A Florido M Aguilar J De Pablo S Alegret |
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| Institution: | Department of Chemical Engineering, ETSEIB, Universitat Politècnica de Catalunya, E-08028 Barcelona Spain;Departament Química, Universitat Autònoma de Barcelona, E-08193 Bellaterra Spain |
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| Abstract: | Free cyanide and cyanide present in weak complexes are determined by using two flow- through silver iodide/silver sulphide electrodes with an intervening gas diffusion unit. Under optimal conditions, the linear range is 10?5?10?3 mol dm?3 cyanide, and the relative standard deviations are ca. 2%, with a sampling rate of 20 h?1. Total cyanide can be determined in the presence of Zn(II), Cu(II) and Cd(II) but results are low with Ni(II), Co(II) or Fe(III) present. Sulphide and thiocyanate must be absent. |
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