Abstract
In this study, a rapid flow injection-flame atomic absorption spectrometry for cyanide detection was developed. Different AgX (where X is Cl-, Br-, I- and N3-) solid-phase reagents (SPR) were tested for indirect determination of cyanide. In a single-line FIA system, the cyanide was allowed to react with AgX SPR, which in turn changed Ag ions in AgX to silver cyanide complexes in a sodium hydroxide carrier stream. The eluent containing the analyte as silver cyanide complexes was measured by FAAS. The calibration curve was linear up to 30 mg l-1 with a detection limit of 0.05 mg l-1 for cyanides. The sampling rate and the relative standard deviation were <1.09% and >200 h-1, respectively. The method was applied to the determination of cyanide in electroplating wastewater.
