Analytical Sciences

A Comparative Study of AgX (X = Cl^-, Br^-, I^- and N₃^-) Solid-Phase Reactors for Flow-Injection Determination of Cyanide in Electroplating Wastewater

Meissam NOROOZIFAR,* Mozhgan KHORASANI-MOTLAGH,** Aboozar TAHERI,* and Rohollah ZARE-DORABEI*

*Analytical Research Laboratory, Department of Chemistry, University of Sistan & Baluchestan, P. O. Box 98135-674, Zahedan, Iran
**Inorganic Research Laboratory, Department of Chemistry, University of Sistan & Baluchestan, Zahedan, Iran

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.

J-STAGE: View this article in J-STAGE