A flow-injection type chemiluminescence-based sensor for cyanide

A chemiluminescence sensor for cyanide combined with a flow-injection system is presented in this paper. Based on the chemiluminescence reaction of luminol immobilized on Amberlyst A-27 anion-exchange resin and copper ion immobilized on D151 large-pore cation-exchange resin with CN− in alkaline solution, the sensor can be used for CN− monitoring with a wide linear range, high sensitivity as well as simplicity of instrumentation. The sensor response to the concentration of cyanide is linear in the range of 5.0 × 10−9 to 2.0 × 10−6 g ml−1 with a relative standard deviation of < 5% (n = 7). The detection limit is 2.0 × 10−9 g ml−1. The results can be obtained within 1 min for each measurement. The column with immobilized chemiluminescence reagents can be used 200 times. The sensor has been used for CN− monitoring in tap water and industrial waste water; the results are consistent with those obtained by an established chemiluminescence method.