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Iranian researchers successfully measured low concentrations of the toxic and harmful cyanide ion in aqueous environments by using nanotechnology.
"Synthetic silver nanoparticles were used in the research as the colorimetric sensor in order to measure low concentrations of cyanide ion in aqueous environments," Salahoddin Hajizadeh, MSc in analytical chemistry from Urmia University, told the INIC.
According to him, the purpose of this research was to present a simple, cost-effective, selective, and sensitive method for the measurement of low concentrations of the toxic and dangerous cyanide ion in water by using nanotechnology.
"The pollution of water reservoirs with cyanide compounds is among the important environmental challenges. Most of the reported colorimetric methods to measure cyanide are based on organic colors, so they are applicable in organic environments. Therefore, it is necessary to present a simple and cost-effective method to measure cyanide in aqueous solutions," he added.
Elaborating on the method of the research, Hajizadeh said, "Colloidal solution of silver nanoparticles has a bright yellowish color. Therefore, the formation and stabilization of silver nanoparticle solution can be confirmed by using ultraviolet-visible light spectroscopy analysis. The synthesized silver nanoparticle solution is stable for months in the dark at the room temperature, and its SPR adsorption band of the solution does not change. However, when the aqueous cyanide solution is added to silver nanoparticle solution, its color becomes pale. The solution becomes colorless at the presence of extra amount of cyanide."
"The increase in the intensity of SPR adsorption band is in proportion with the concentration of cyanide, and there is a linear relation between the concentration of cyanide and the reduction in the adsorption of silver nanoparticle solution."
Hajizadeh explained about the advantage of the presented method, and added, "This method can easily be used with naked eye, or by using a simple spectrophotometer device in order to detect cyanide in water."
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