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

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.

Design of a novel optical sensor for determination of trace amounts of copper by UV–visible spectrophotometry in real samples

“…Various analytical methods have been proposed for the determination of copper at low concentration levels. Most of them are photometric methods, flame atomic absorption spectroscopy, graphite furnace atomic absorption spectroscopy, inductively coupled plasma emission spectrometry and voltammetry . A variety of reagents have been used for constructing copper optodes.…”

Determination of cyanide in wastewaters using modified glassy carbon electrode with immobilized silver hexacyanoferrate nanoparticles on multiwall carbon nanotube

“…A large number of analytical methods have been published concerning the determination of cyanide in water and wastewaters including ion-selective potentiometry [5], indirect atomic absorption spectrometry [6][7][8][9], spectrofluorimetry [10,11], molecular absorption spectrophotometry [12], chromatographic technique [13] and capillary electrophoresis [14]. There are numerous methods for determination of cyanide in the water and wastewater samples [15].…”

Investigation of a new electrochemical cyanide sensor based on Ag nanoparticles embedded in a three-dimensional sol–gel

“…Our research group previously published some new methods for determination of cyanide using flow injection analysis-flame atomic absorption spectrometry (FIA-FAAS) by solid-phase reagents (SPR) such as MCO 3 (M = Cd, Zn), Ag 2 X (X ¼ SO 2À 3 , Cr 2 O 2À 7 , C 2 O 2À 4 and CO 2À 3 ) and AgX (X = Cl À , Br À , I À and N 3 À ) [29][30][31][32]. The best detection limit was obtained 1.92 Â 10 À6 mol L À1 .…”