Determination of available cyanide in water by ligand exchange-flow injection analysis
QIAO Xiao-yu1,2，LI Hua-chang2，YU Li2，ZHANG Ping3
1．College of Chemistry and Biology Engineering， Guilin University of Technology， Guilin 541004， China；2．Sub-Institute of Analytical Chemistry，Beijing General Research Institute of Mining and Metallurgy， Beijing 102600， China；3.Beijing Polytech Instrument Ltd.， Beijing 102208， China
Abstract：A method for the determination of the available cyanide，namely, the total of cyanide including ions (CN-)，HCN (aq)，as well as zinc，copper，cadmium，mercury，nickel and silver cyanide complexes in water by ligand exchange reagents and CNSolution FS 3100 cyanide analyzer, has been studied. Gaseous HCN which was generated in the reaction module entered into alkaline absorption solution by gas diffusion diaphragm (GD) and was converted to cyanide ions (CN-)，and then was detected by ammeter in the flow testing pool. The interference of methanal, phenol, sodium hypochlorite, and sulfide to the determination of CN- was inspected and removed. The experiment results indicated that, in the range of cyanide concentration between 2.0-1 000 μg/L，r>0.999 6；the detection limit of method was 0. 6 μg /L；the relative standard deviation (RSD) (n=5) was smaller than 2.5%，the recoveries of real samples were 92%-102%. It can be applied to detect the available cyanide in large amount of surface water，groundwater，drinking water and wastewater of petroleum chemical industry，metallurgy，electroplating，papermaking.
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