1986 Volume 2 Issue 5 Pages 431-437
A simple method for the selective determination of ammonious nitrogen and cyanide by means of triangle-programmed coulometric titration in a flow through system is described. Ammonia and hydrogen cyanide are transferred across a gas permeable membrane. After absorbtion in a suitable acceptor stream ammonium and cyanide ions are titrated with electrolytically generated Obr- and I2 respectively. The titration curves are followed continuously with a biamperometric flow through detector as a function of time. Linear concentration dependence was found in the ranges of 100μg l-1-50mg l-1 NH3 and 100μg l-1 -40mg l-1 CN- (r2_??_0.999). The standard deviations at 135μg l-1 NH3 and at 120μg l-1 CN- are 3.1 and 2.8%, respectively.
