As a result of the significant disruption that is being caused by the COVID-19 pandemic we are very aware that many researchers will has difficulty in meeting the timelines associated with our peer review process during normal times.  Please do let us know if you need additional time. Our systems will continue to remind you of the original timelines but we intend to be highly flexible at this time.

Ionic liquid

  • Nobel Method for Toluene Removal from Air Based on Ionic Liquid Modified Nano-Graphen

    Nobel Method for Toluene Removal from Air Based on Ionic Liquid Modified Nano-Graphen

    A b s t r a c t

    the aim of this study was to investigate the removal of toluene from air through Nano-graphene modified by ionic liquid (NG-IL). The batch adsorption experiments in glass bottle of gas chromatography equipped with flame ionization detector (GC-FID) were used. Graphene ultrahigh-quality synthesized by substrate-free gas-phase method in a single step and graphene sheets were deposited with ionic- liquid by thermal adsorption in acetone blank solution. Various conditions including contact time, amount of adsorbent, adsorbate concentration, humidity, and temperature were studied and optimized. NG-IL adsorbent was used for the adsorption of toluene vapor from gaseous media and the effect of different conditions such as; toluene concentration, humidity, and temperature on the adsorption were investigated. The Langmuir adsorption isotherms were employed for toluene by NG-IL adsorbent. The adsorption capacity was decreased by raising the sorbent humidity above of 50 percent. The toluene capture capacity for NG-IL was 126 mg/g. The results of SEM, XRD and TEM showed that the NG-IL have beneficial surfaces for toluene removal. NG-IL as a novel adsorbent has not previously been used for the adsorption of pollutants.

    Authors

    HAMID SHIRKHANLOO, MAHMOOD OSANLOO, and ORKIDEH QURBAN DADRAS

    ACKNOWLEDGEMENTS

    The authors are thankful to the Iranian Occupational and Environmental Health Laboratory of IPIHRIEHRC, PIHO, for their support for this work. The authors declare that there is no conflict of interests.

    Download Paper



  • Preconcentration and Determination of Trace Amount of Nickel in Water and Biological Samples by Dispersive Liquid–Liquid Microextraction

    Preconcentration and Determination of Trace Amount of Nickel in Water and Biological Samples by Dispersive Liquid–Liquid Microextraction

    A b s t r a c t

    Anew, simple and highly sensitive dispersive liquid–liquid microextraction method using a ionic liquid, i.e., 1-Butyl-3-methylimidazolium hexafluorophosphate ([C4MIM][PF6]) for nickel determination at trace levels in real samples was developed. Nickel was chelated with diethyl dithiocarbamat reagent and extracted into an ionic liquid. Ni was back-extracted from the IL phase with 200 L of 0.5 mol L-1 nitric acid and determined by electrothermal atomic absorption spectrometry (ETAAS). Various parameters such as pH, amount of ionic liquid, eluent type and volume, chelating agent concentration, volume of the sample solution and matrix interference effect on the recovery of the metal ions have been studied. Under the optimum conditions, the enrichment factor 100 was obtained from only 20 mL of sample. The calibration graph was linear in the rage of 20-700 ng L-1 of nickel with detection limit of 5 ng L-1. The relative standard deviation (R.S.D.s) for eight replicate measurements of 20 ng L-1 of nickel was 5.6%. Validation of the methodology was performed by standard addition method and analysis of certified reference material. The method was successfully applied to the determination of Ni+2 in serum and tap water samples.

     

     

     

    Authors

    Hamid Shirkhanloo, Ahmad Rouhollahi and Hassan Zavvar Mousavi

    ACKNOWLEDGEMENTS

    The financial support of this work by K. N. Toosi University of Technology and Semnan University Research Council are greatly acknowledged

    Download Paper

     

  • Speciation and Determination of Trace Amount of Inorganic Arsenic in Water, Environmental and Biological Samples

    Speciation and Determination of Trace Amount of Inorganic Arsenic in Water, Environmental and Biological Samples

    A b s t r a c t

    Anew speciation and preconcentration method based on dispersive liquid-liquid microextraction has been developed for trace amounts of As(III) and As(V) in urine and water samples. At pH 4, As(III) is complexed with ammoniumpyrrolidine dithiocarbamate and extracted into 1-Hexyl-3-methylimidazolium hexafluorophosphate, as an ionic liquid (IL) and As(III) is determined by electrothermal atomic absorption spectrometery (ETAAS). Arsenic(V) in the mixing solution containing As(III) and As(V) was reduced by using KI and ascorbic acid in HCl solution and then the procedure was applied to determination of total arsenic. Arsenic(V) was calculated as the difference between the total arsenic content and As(III) content. The effect of various parameters on the recovery of the arsenic ions has been studied. Under the optimum conditions, the enrichment factor 135 was obtained. The proposed method was successfully applied to the determination of trace amounts of As(III) and As(V) in water and biological samples.

    Authors

    Hamid Shirkhanloo, Hassan Zavvar Mousavi and Ahmad Rouhollah

    ACKNOWLEDGEMENTS

    The financial support of this work by K. N. Toosi University of Technology and Semnan University Research Council are greatly acknowledged.

    Download Paper

  • Ultra-trace Arsenic Determination in Urine and Whole Blood Samples

    Ultra-trace Arsenic Determination in Urine and Whole Blood Samples

    A b s t r a c t

    A noble method for pre-concentration and speciation of ultra trace As (III) and As (V) in urine and whole blood samples based on dispersive liquid-liquid microextraction (DLLME) has been developed. In this method, As (III) was complexed with ammonium pyrrolidine dithiocarbamate at pH = 4 and Then, As (III) was extracted into the ionic liquid (IL). Finally, As (III) was back-extracted from the IL with hydrochloric acid (HCl) and its concentration was determined by flow injection coupled with hydride generation atomic absorption spectrometry (FI-HGAAS). Total amount of arsenic was determined by reducing As (V) to As (III) with potassium iodide (KI) and ascorbic acid in HCl solution and then, As (V) was calculated by the subtracting the total arsenic and As (III) content. Under the optimum conditions, for 5-15 mL of blood and urine samples, the detection limit (3σ) and linear range were achieved 5 ng L−1 and 0.02-10 μg L−1, respectively. The method was applied successfully to the speciation and determination of As (III) and As (V) in biological samples of multiple sclerosis patients with suitable precision results (RSD < 5%). Validation of the methodology was performed by the standard reference material (CRM).

    Authors

    Hamid Shirkhanloo,†,‡ Ahmad Rouhollahi,†,* and Hassan Zavvar Mousavi§

    ACKNOWLEDGEMENT

    The authors thank from Petroleum Industry Health Organization (PIHO), Medical Industrial Laboratory of PIHO and Research Institute of Petroleum Industry (IRPI), Tehran, Iran.

    Download Paper

     

Contact us

Publisher:AMECJ publisher with the License number of 83095 From the Ministry of Guidance, Iran. To see the Certificate please click here.

Madadkaran Alley,Farjam St., Shahnazari Ave, Mirdamad, 

Tehran, Iran     P: 1545653718