On-line Pre-Concentration and Separation of Inorganic Arsenic Based on Nano Platinum-Multiwall Carbon Nanotubes
محورهای موضوعی : Journal of NanoanalysisHamid Shirkhanloo 1 , Ali Akbar Miran Beigi 2 , Amir Vahid 3 , Nasrin Shirkhanloo 4 , Behzad Kalantri 5 , Hossein Ali Ghadirian 6
1 - Occupational and Environmental Health Research Center (IPIOEHRC), Iranian Petroleum Industry Health Research Institute (IPIHRI), Tehran, Iran
2 - Research Institute of Petroleum Industry (RIPI), P.O. Box 14665-1137, Tehran, Iran
3 - Research Institute of Petroleum Industry (RIPI), P.O. Box 14665-1137, Tehran, Iran
4 - Department of Chemistry, Amirkabir University of Technology,P.O.Box 15875-4413, Tehran, Iran
5 - Department of Environment, P.O. Box 15875-5181, Tehran, Iran
6 - Research Institute of Petroleum Industry (RIPI), P.O. Box 14665-1137, Tehran, Iran
کلید واژه: Arsenic, Water samples, Nano Platinum, Multiwall Carbon Nanotubes, Pre-concentration, Cold Vapor Atomic Absorption Spectrometry,
چکیده مقاله :
On-line solid phase extraction (SPE) based on nano adsorbent for pre-concentration of inorganic arsenic in water and waste water samples was developed prior to determine by hydride generation atomic absorption spectrometry (HG-AAS). By hydride generation simulation system (HGSS), the inorganic arsenic in liquid samples changed to hydride form and pass through nano platinum multi wall carbon nanotube (3 wt % Pt, NPt-MWCNT,). The hydride form of arsenic (AsH3), pre-concentrated on NPt-MWCNTs and then completely desorption by electric heater accessory at 200oC for determining. The detection limit (LOD) and linear range of perposed method were obtained 0.4 ng L-1 and 6 –410 ng L-1 respectively(R2 = 0.9988). The relative standard deviations (%RSD) at 100 ng L-1 of analyte were found less than 5%. The capacity and efficiency of nano adsorbent were 75 mg g-1 and 96% at argon flow rate less than 100 ml min-1. The developed method was applied successfully to determination of ultra trace of inorganic arsenic in environmental samples by HG-AAS.
