A b s t r a c t

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 (HGAAS). 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.

 

 

 

 

Authors

Hamid Shirkhanloo, Ali Akbar Miran Beigi, Amir Vahid, Nasrin Shirkhanloo, Behzad Kalantri and Hossein Ali Ghadirian

Conclusions

The aim of this work was to develop a new, simple and sensitive method for pre-concentration of ultra-trace arsenic prior to determine by HG-AAS. In this study, SPME method has been developed based on 100 mg of Pt-MWCNT for pre-concentration of ultra-trace arsenic. The experimental parameters such as, amount of sorbent, argon flow rate and volume of sample have been optimized. The perposed method had high precision and accuracy results with low LOD and high pre-concentration factor (PF). The developed method was applied successfully to determination of arsenic in water and waste water samples. The pre-concentration factor was 148.

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