پديدآورندگان :
Behbahani Mohammad Faculty of Engineering, Shohadaye Hoveizeh University of Technology, Dasht-e Azadegan, Susangerd, Iran , Sobhi Hamid Reza Department of Chemistry, Payame Noor University, Tehran, Iran , Esrafili Ali Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran , Kalate Bojdi Majid Department of Chemistry, Faculty of Science, University of Birjand, Birjand, Iran , Ghambarian Mahnaz ghambarian.m@gmail.com Iranian Research and Development Center for Chemical Industries, ACECR, Tehran, Iran, , Esrafili Leili Department of Chemistry, Tarbiat Modares University, Tehran, Iran
كليدواژه :
Electrochemical sensor , Cadmium ion , Modified siliceous mesocellular foam , Dithizone.
چكيده فارسي :
In recent years, the pollution of natural water by the release of heavy metals has attracted great consideration because of high pernicious and bioaccumulation factor in the food samples [1]. Cadmium, as one of the highly toxic heavy metal, has become widespread as an outcome of many industrial and agricultural applications [2]. Cadmium has been identified as a harmful environmental contaminant known to generate highly toxic effects on different organs and systems of animals and humans [3]. The maximum contaminant level (MCL) permissible by the American Environmental Protection Agency (USEPA) in drinking water is 10 μg L-1 to enable sample protection of human health [4]. According to the increasing use of cadmium in the industrial and its serious hazardous effects on human health, wide studies have been carried out on the development of methods for determination of Cd(II). Therefore, it is desired to design selective, simple, eco-friendly and efficient methods for the monitoring of Cd(II) in environmental and biological samples [5].In the present work modified siliceous mesocellular foam with dithizone was used as a sensitive electrochemical sensor for ultra-trace detection of Cd2+ ions in environmental water samples. The present material used as the electrode material was characterized by scanning electron microscopy, Fourier transform infrared spectrometry, nitrogen adsorption-desorption examination, thermal evaluation and elemental analysis. The introduced modified electrode combined with differential pulse anodic stripping voltammetry was used as the simple and applicable electrochemical method for ultra-trace detection of Cd2+ ions. The strong interaction of cadmium ions with active sites of dithizone in the porous of prepared electrochemical material and its reduced at a negative potential (-0.9 V) was applied for preconcentration of target on the electrode surface. For analysis of target ions at ultra-trace levels, the reduced cadmium ions were oxidized by differential pulse anodic stripping voltammetry.
