Determination of cyanide by a flow injection analysis-atomic absorption spectrometric method.
A new flow injection analysis (FIA) procedure is proposed for the indirect atomic absorption spectrometric determination of cyanide. The FIA manifold is based on the insertion of the sample into a distilled water carrier, then the sample flows through a solid-phase reactor filled with silver iodide entrapped in polymeric resin beads. The calibration graph is linear over the range 0.2-6.0 mg l-1 of cyanide (correlation coefficient 0.9974), the detection limit is 0.1 mg l-1, the sample throughput is 193 h-1 and the RSD is 0.8%. The method is simple, quick and more selective than other published FIA procedures. The reproducibility obtained by using different solid-phase reactors and solutions is in the range 2.2-3.1% (RSD). The method was applied to the determination of cyanide in commercial samples such as pharmaceutical formulations and industrial electrolytic baths.
López Gómez
A V
AV
Departamento de Química Analítica, Universidad de Valencia, Spain.
Martínez Calatayud
J
J
D003486:Cyanides / Q000032:analysis*; D017022:Flow Injection Analysis; D013054:Spectrophotometry, Atomic
D003486:Cyanides