http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
Sumaira Khan,Tasneem Gul Kazi,Mustafa Soylak 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
An in-syringe ionic liquid-based single step microextraction has been analytically presented. 1-butyl-3-methylimidazolium hexafluorophosphate as extractant and Triton X-100 as dispersing medium wereused. Cd-Dithizone was extracted within a syringe. The effects of some variables such as [C4mim][PF6]volume, pH, TX-100 volume, dithizone concentration, incubation time, diluents nature and matrix effectwere investigated. The limit of detection and preconcentration factor were found as 0.35 mg L 1 and 50,respectively. The validity was checked by using certified reference materials. The relative standarddeviation (RSD) was 4.2%. The method was satisfactorily applied to preconcentration of cadmium innatural water samples.
Asma Akhtar,Tasneem Gul Kazi,Hassan Imran Afridi,Mustafa Khan,Muhammad Bilal,Noman Khan 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
A modified cloud point extraction method (m-CPE) was developed for the speciation of chromium species (Cr3+ and Cr6+) in artificial saliva extracts (ASE) of snuff products. In this method, Cr3+ was complexed with 8-hydroxyquinoline, which was trapped in nonionic surfactant (Triton X-114), prior to analyzed by electrothermal atomic absorption spectrometer (ETAAS). Whereas, the total extractable Cr was determined by reducing Cr6+ to Cr3+ using Na2SO3 as a reducing reagent. Several parameters were optimized for the developed m-CPE. Under the most favorable conditions, enrichment factor, enhancement factor and limit of detection for the proposed method were 60, 134 and 0.04 μg L−1, respectively having relative standard deviation <5%. Health risks associated with the intake of total Cr in snuff products was also assessed. Estimated daily intake of Cr via sniffing 10 g/day of dry and moist snuff products was found below the maximum tolerable daily intake whereas the calculated risk for cancer due to Cr was observed in the acceptable range of 10 E−6–E−4.
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.
Faheem Shah,Naeemullah,Tasneem Gul Kazi,Rafaqat Ali Khan,Murtaza Sayed,Hassan Imran Afridi,Khizar Hussain Shah,Jan Nisar 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.48 No.-
A novel restricted access sorbents based micro solid phase extraction (RAS-mSPE) for the extraction ofheavy metal from biological samples has been developed. Cadmium (Cd) and manganese (Mn) weredirectly extracted skipping the tedious, time consuming and expensive sample preparation stepexcluding all of the existing proteins. Sorbent’s (activated carbon cloths) surface was modified withbovine serum albumin through glutaraldehyde to make restricted access sorbent (RAS). Differentvariables affecting the extraction efficiency were selected for optimization. The limits of detectionobtained for Cd and Mn were 0.252 and 0.214 mg L 1, respectively. Analyte recoveries in fortified humanwhole blood serum and milk samples were found in the range of 90.3–103.9%. The procedure waseffectively used for Cd and Mn extraction in real samples devoid of any pretreatment step.