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water samples

  • Determination of Trace Amount of Lead in Industrial and Municipal Effluent Water Samples Based on Dispersive Liquid-Liquid Extraction

    Determination of Trace Amount of Lead in Industrial and Municipal Effluent Water Samples Based on Dispersive Liquid-Liquid Extraction

    A b s t r a c t

    In this study, a simple, sensitive and accurate method was developed for the determination of lead ion by combining ionic liquid dispersive liquid-liquid extraction (il-dlle) with flame atomic absorption spectrometry. Tetraethylthiuram disulfide (tetd), acetone and 1-octyl-3-methylimidazolium hexafluorophosphate [(C8mim) (PF6)] were used as the chelating agent, dispersive and extraction solvent, respectively. Under the optimal conditions, the calibration graph was linear in the range of 5-190 μg L−1 of lead and the detection limit was 0.8 μg L−1 with a sample volume of 200 mL. The proposed method was validated by the analysis of one certified reference material and applied successfully to the determination of lead in real water samples.

     

     

     

     

     

    Authors

    Hamid Shirkhanloo, Kaveh Sedighi, and Hassan Zavvar Mousavi

    ACKNOWLEDGEMENTS

    The authors are thankful to Iranian Petroleum Industry Health Research Institute (ipihri) and Research Institute of Petroleum Industry (ripi) for their support for this work.

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

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

    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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