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Naeemullah,Mustafa Tuzen,Tasneem Gul Kazi 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Simple, rapid and miniaturized portable micropipette tip-syringe solid phase microextraction methodwas developed for speciation of vanadium in water and food samples. Tetra ethylene pentaminefunctionalized multiwalled carbon nanotubes were synthesized and packed in micropipette tip-syringesystem. The surface morphology of adsorbent was characterized, and the effective factors that influencethe efficiency of developed method such as pH, amount of adsorbent, concentration of acid solution fordesorption cycles were studied. The V(V) could be adsorbed on the modified adsorbent surface with tetraethylene pentamine, while V(IV) could not be retained. The assay of V(IV) was based on subtractingvalues of V(V), from total vanadium. The extracted total vanadium and V(V) were injected directly intothe electrothermal atomic absorption spectrometry for analysis. Enhancement factor and detection limitwere found 50 and 0.008 mg L 1, respectively. Accuracy of the method was checked by analysis of certifiedreference materials. The developed method was applied to water and food samples.
Ozlem Zeynep Pekiner,Mustafa Tuzen,Naeemullah 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
We developed a new method three phase liquid–liquid microextraction (TPLLME) for simultaneous speciation of vanadium. This efforts were launched to know the species and aqueous transport chemistry of the binary V-(1-(2-Pyridylazo)-2-naphthol) complex across the interface of the three phases. Various analytical parameters were optimized. The limit of detection (LOD) was 0.034 mg L 1 and 0.028 mg L 1 for V(V) and V(IV) with preconcentration factor of 100. Relative standard deviation (RSD) was found 4.32% for V(V) and 4.22% for V(IV). The proposed method was applied to species of vanadium successfully in sea water and tap water samples. The method was also applied to certified reference material and food samples for total vanadium determination.
Naeemullah,Tasneem Gul Kazi,Mustafa Tuzen 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
A novel, simple and rapid single and multi-step cloud point extraction procedure was developed for theselective and simultaneous preconcentration of silver, cadmium and nickel in real samples prior to theirdetermination by flame atomic absorption spectrometry. Dithizone was used as neutral hydrophobiccomplexing agent. Separation of understudy metals can be achieved by controlling the pH value of theextraction system. Evaluation of the two CPE methods was checked by paired t-test, which indicated anon-significant difference. It was successfully applied to the real water sample. Certified referencematerials were used for the accuracy of the green extraction methods. The regression equation for thecalibration curve was linear in the range of 10–150 mg L 1 for Ag, 5–100 mg L 1 for Cd, 10–200 mg L 1 forNi. Relative standard deviation (RSD%) values were found to be lower than 2.5% for all elements. Enhancement factor (EF) and limit of detection (LOD) values were found in the range of 41–58 and 0.27–1.12 mg L 1, respectively.
Esra Durduran,Huseyin Altundag,Mustafa Imamoglu,Salih Zeki Yıldız,Mustafa Tuzen 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Silica gel was functionalized with N-(2-aminoethyl)-2,3-dihydroxybenzaldimine group (AEDHB-SG) andcharacterized by elemental analysis and FT-IR spectroscopy. Preconcentration conditions of Cd(II), Cu(II),Ni(II) and Pb(II) were investigated on the AEDHB-SG loaded column using a solid phase extractiontechnique. The effects of parameters such as the pH, sample volume, flow rates, matrix ions wereexamined. Adsorption capacity of AEDHB-SG for Cd(II), Cu(II), Ni(II) and Pb(II) was 0.40, 0.56, 0.50 and0.23 mmol g 1. The accuracy of the developed method was confirmed by certified reference materials. Optimized method was applied to water and food samples for the determination of trace metals usingICP-OES.