On-line Pre-Concentration and Separation of Inorganic Arsenic Based on Nano Platinum-Multiwall Carbon Nanotubes

Journal of Nanoanalysis

مقاله 1، دوره 1، شماره 2، آبان 2014، صفحه 52-57   

شناسه دیجیتال (DOI): 10.22034/jna.2014.02.001

نویسندگان

Hamid Shirkhanloo^{* 1}؛ Ali Akbar Miran Beigi²؛ Amir Vahid²؛ Nasrin Shirkhanloo³؛ Behzad Kalantri⁴؛ Hossein Ali Ghadirian²

¹Occupational and Environmental Health Research Center (IPIOEHRC), Iranian Petroleum Industry Health Research Institute (IPIHRI), Tehran, Iran

²Research Institute of Petroleum Industry (RIPI), P.O. Box 14665-1137, Tehran, Iran

³Department of Chemistry, Amirkabir University of Technology,P.O.Box 15875-4413, Tehran, Iran

⁴Department of Environment, P.O. Box 15875-5181, Tehran, Iran

چکیده

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 200^oC 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.

کلیدواژه‌ها

Arsenic؛ Nano Platinum؛ Multiwall Carbon Nanotubes؛ Pre-concentration؛ Water samples؛ Cold Vapor Atomic Absorption Spectrometry