Potentiometric determination of cyanide in effluents having high concentration of chloride

The est~mat~oofn c yanide IS generally done by titrimetry, colorimetry and polarography but each method has its own limitations. Argenlometric titration method IS not satisfactory at low cyanide concentralion at ppm levels. Distillation and colorimetry method is accurate but time consuming. Presence of large quant~t~eosf chloride does not permit the use of ion selective electrodes. Other methods available are Double Pulse Polarography and Atomic Absorption Spectroscopy. They involve sophisticated costly ~nstrumentsa nd are d~tt~cualst tar as small scale industries are concerned. It has been observed that potentiometric t~trationm ethod can be more easily adopted wlth falr accuracy even at ppm levels. The most Important advantage is that the estimations can be done at fast rate and does not require much of sophsticated ~nslrumentso r techn~que.S eries of experiments were carried out with varying cyanide concentrat~ons and large excess of chloride ions. Detection limit by this method is 100 ppb and the results agree well w~thth ose obtamed by the other methods. The results on actual samples and standards are presenled In thls paper

Electrochemical oxidation as a tool for pollution control: part-III studies of the packed bed electrolysers for the destruction of cyanide

Cyanides are potential pollutants even in traces and regulations limiting the cyanide concentration in industrial effluents down at 0.2 pprn and the permissible tolerance for inland surface waters at 0.01 Dpm have been specified. Several investigations on the electrooxidation of cyanide in the effluent have been reported in literature Use of three dimensional electrodes has been the recent development in this area of research. In the present paper, a comparison of packed bed electrode cells of different configurations has been made for the anodic oxidation of cyanide. The initial concentration of electrolyte has been maintained at cyanide 200 pprn and NaCl 5 gpl. It has been observed that the packed bed cells of flow-bypassconfiguration function better than the flow through cell

Electrochemical oxidation as a tool for pollution control : VII-destruction of cyanide using stack reactor system

The plating and metal finishing industries are the major sources of cyanide pollution. Cyanide concentration in effluents varies from 50 to 100 ppm as against tolerance limit of 0.01 ppm for inland surface water. The results of investigation on electrochemical oxidation of cyanide in a packed bed reactor with flow by configuration are reporte

Determination of lead in blood by hydrodynamic voltammetry in a flow injection system with wall-jet detector

10.1016/S0039-9140(97)00297-XTalanta454703-711TLNT