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 , Omidi Fariborz Research Center for Environmental Determinants of Health (RCEDH), Kermanshah University of Medical Sciences, Kermanshah, 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 :
Dispersive micro solid , phase extraction , Nickel , Graphite furnace atomic absorption spectrometry , Magnetic nanoporous sorbent.
چكيده فارسي :
Due to carcinogenicity of the nickel, International Agency for Research on Cancer (IARC) classified nickel as a definite human carcinogen [1]. Nickel level in tap water is generally under 10.0 µg L-1 [2]. The UK drinking water threshold for nickel is 20.0 µg L-1 [3]. Advance instrumental techniques such as ICP-MS, ICP-AES, AAS, etc. [4], has been widely applied for measuring heavy metals at trace levels in different matrices. However, the major difficulties with the mentioned methods are small amount of targets concentration and matrices effect [5]. Sample preparation step before analyzing the targets is necessary to overcome the mentioned troubles. Applying various nanosorbents in dispersive micro solid-phase extraction (D-µSPE) procedure is becoming more popular due to its many advantages, e.g. rapid interaction of nanomaterial and target ions, and the shorter time necessary for sample preparation rather than classical solid-phase extraction (SPE). Ultrasonic assisted dispersive micro-solid phase extraction with a new magnetic material using pyridine functionalized magnetic nanoporous sorbent was utilized for trace detection of nickel ions. Magnetized nanoporous silica (MCM-41) was modified with pyridine groups and the structured of prepared magnetic nanoporous sorbent was confirmed using Fourier transformed infra-red Spectroscopy (FTIR), X-ray diffraction analysis (XRD), thermogravimetric and differential thermal analysis (TGA/DTA) and transmission electron microscopy (TEM). Pre-concentrated nickel using the mentioned sample preparation procedure was monitored by graphite furnace atomic absorption spectrometry at ng L-1 concentrations. Relative standard deviation and method detection limit for nickel monitoring under optimized conditions by UA-D-µSPE was found to be 6 % and 0.008 µg L-1, respectively.
