فهرست مطالب

Analytical Methods in Environmental Chemistry Journal - Volume:3 Issue: 1, 2020
  • Volume:3 Issue: 1, 2020
  • تاریخ انتشار: 1399/03/24
  • تعداد عناوین: 7
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  • Anne Trégouët Trégouët, Masoud Khaleghi Abbasabadi, Pooya Gholami * Pages 5-16

    Nickel (Ni) is toxic effect on human body and must be determined in human blood samples. In this study, Ni ions separated and preconcentrated from blood samples based on magnetic Fe 3 O 4 -supported amine/amide-functionalized graphene oxide (Fe 3 O 4 @A/A-GO) nanoparticles by dispersive sonication micro solid phase extraction (DS-μ-SPE). By procedure, 10 mg of Fe 3 O 4 @A/A-GO was dispersed in 10 mL of human blood samples with sonication for 5.0 min and then separated from liquid phase with magnetic accessory. The Ni ions was extracted based on amine/amide covalence bonding of Fe 3 O 4 @A/A-GO sorbent (Ni---: NH 2 ). Then, the Ni ions back-extracted from Fe 3 O 4 @A/ A-GO in low pH with nitric acid (0.2 mL, 0.3 M) which was diluted with DW up to 0.5 mL and finally, was determined by ET-AAS (peak area). The LOD, linear range (LR), enrichment factor (EF) and absorption capacity (AC) were obtained 35 ng L -1 , 0.15 -7.2 μg L -1 , 19.8 and 131.6 mg g -1 , respectively. The method was validated by spiking samples.

    Keywords: Nickel, Human blood, Fe3O4-supported Amine, Amide-functionalized graphene oxide, Dispersive sonication micro solid phase extraction
  • Shahnaz Teimoori, AmirHessam Hassani*, Mostafaa Panaahie Pages 17-26

    Removal of benzene, as hazardous pollutants from waters and wastewater is a main problem of environment contamination due to high risk factor in human health. In this study, the phenyl sulfonic acid (PhSA) modified carbon nanotubes (CNTs) were used for benzene removal from waters by dispersive micro solid phase extraction method (D- μSPE). Due to adsorption mechanism, the polar–π and π–π electron donor–acceptor interactions was provided between the aromatic ring of benzene with the surface sulfonic acid groups (SO3H) and phenyl ring (-C6H5) of CNTs, respectively. Therefore, 20-100 mg of sorbent, concentration of benzene (0.1–10 mg L-1), pH (1-12) and contact time (5–120 min) were investigated and optimized for benzene removal from water samples in static system. The concentration of benzene in water was determined by static head space gas chromatography mass spectrometry (SHS-GC-MS). The results showed, the LangmuirFreundlich (LF) isotherm provided the best fit for benzene sorption. By using the Langmuir model, the maximum adsorption capacity of 157.34 mg g-1 and 22.86 mg g-1 was achieved for benzene removal from waters with CNTs@PhSA and CNTs, respectively. The method was validated by certified reference material in waters.

    Keywords: Benzene, Water, Dispersive micro solid phase extraction, Phenyl sulfonic acid, Carbon nanotubes, Static head space gas chromatography mass spectrometry
  • Amir Vahid*, Masoud Sohrab Pages 27-40

    In this study, re-refining of used insulating oil by mesoporous silicate material (MCM-41) and metallic sodium was investigated. Also, the effect of silicate absorbents which was synthesized and functionalized with aluminum (Al-MCM-41) was studied (18 wt% and 36 wt%). The physical and structural properties of Al-MCM-41 were characterized by FT-IR, BET, XRD, FESEM and the obtained results illustrated a successful synthesis of the mesoporous material. The refined oil was treated by MCM41 adsorbent. After that, total acid number (TAN) of used insulating oil was effectively reduced by metallic sodium. The effect of some parameters such as contact time, temperature and the dosage (sodium and adsorbent to oil ratio) was designed and optimized by response surface method (RSM). The results showed that the acid number incredibly decreased at 150, 60 min and 2% of sodium to oil. The color of the re-refined oil was significantly reduced. The factors such as, time, temperature and dosage was statistically studied by ANOVA. The adsorption of MCM-41 was also studied by this way. Based on proposed procedure, the modeling was carried out. Treating of oil with MCM-41 after using metallic sodium causes lower color of oil.

    Keywords: Used oil, Color reduction, Total Acid Number, Re-refining, Mesoporous material, Optimization
  • Nafiseh Esmaeili, Nadia Kokabi, Eskandar Kolvari* Pages 41-48

    A simple and applied method based on O-3-Tert-butylphenyl N-(6-methoxy-2pyridyl)-N-methylthiocarbamate (Pyributicarbamate; TBMPMTC) was used for arsenic speciation (AsIII and AsV) in urine and water samples by dispersive liquid-liquid microextraction (DLLME) procedure. The concentrations of arsenic in the liquid phase were determined by hydride generation atomic absorption spectrometry in the presence of flame accessory (HG-AAS). By procedure, a mixture of ionic liquid (0.1 g, [APMIM][PF6]@[HMIM] [PF6]), acetone (0.2 mL) and pyributicarbamate was injected into wastewater sample containing arsenic (AsIII and AsV) ions, which were already extracted by pyributicarbamate at the optimized pH. The task-specific ionic liquid (TSIL) of 1-3-aminopropyl)-3-methyl-imidazoliumhexafluorophosphate [APMIM] [PF6] was chemically synthesized and used for increasing of As(V) extraction in the liquid phase. As(III) was extracted based on the sulfur bond of pyributicarbamate at pH=5.3. As (V) can be extracted by amine group of TBMPMTC and [APMIM][PF6] at pH=3.0 (As(V)---:NH2). The influence of parameters such as, pH, amount of ionic liquid, and ligand was studied. Based on results, the LOD, enhancement factor (EF) and linear range (LR) were obtained 3.2 ngL-1, 9.85 and 0.01-1.2 μg L−1, respectively. The procedure validated by certified reference material (CRM).

    Keywords: Arsenic, Speciation, Wastewater, Pyributicarbamate, Task specific Ionic liquid, Dispersive liquid-liquid microextraction
  • Alisha Saanvi, Ringo Krishnan, Amoli Hassan, Rmesh K. Guptaa* Pages 49-54

    Lately a flood of expanded enthusiasm for the peeling of boron nitride (h-BN) has seen because of its energizing electrical, warm, photonics mechanical properties and detecting. A few ways to deal with have risen depicting the peeling, functionalized and solubilization of h-BN. In this investigation, we report on a direct way to deal with alter the surface and its application as another sort of biomedical applications. The readied item is basically described by FTIR spectroscopy, field outflow (FESEM), TGA strategy, XPS range, and BET surface zone estimations. Nano-composites were immobilized on terminals to distinguish the glucose, L-cysteine in cushion medium by cyclic voltammetry (CV), square wave voltammetry (SWV), and electrochemical impedance spectroscopic (EIS). Potential utilization of the covalent functionalization, modest forerunners, biodegradability and multifunctionality of superior composites boron nitride, they could be utilized for a wide scope of things to come biomedical applications. Also, the composites boron nitride was used for extraction lead (Pb2+) ions in human serum by micro solid phase extraction coupled with atom trap atomic absorption spectrometry (AT-AAS) by researchers. The LOD and enrichment factor was obtained 2.96 and 9.82, respectively for 10 mL of human serum sample (RSD < 2%). The validation was confirmed by CRM, NIST solution.

    Keywords: Boron nitride nanosheets, Triazine azide, Lead, L-cysteine, Electrochemical Sensor, Solid phase extraction
  • Jamileh Esmaeili, Samira Shirooei, Azam Bakhtiarian* Pages 55-62

    The low concentration of copper (Cu2+) can be effected on the central nervous system (CNS) and caused to multiple sclerosis (MS). Although many antibiotics can treat the bacterial infections but some of antibiotics decrease essential metal concentrations in human body and must be controlled by determining. In this study, in-vitro extraction of copper (Cu2+) with amoxicillin/clavulanic acid (AMOXC) has been studied due to interacting with metals. By procedure, Cu2+ ions were separated from blood samples by ultrasound assisted-dispersive centrifuge liquid-liquid micro extraction (USA-DC-LLME). The mixture of AMOXC (0.01 g), ionic liquid ([BMIM][PF6]) and acetone injected to 10 ml of serum blood sample at human pH=7.2. After extraction, the concentration of Cu2+ ions was determined by flame atomic absorption spectrometry (F-AAS). The LOD, enrichment factor (EF), linear range (LR) and working range (WR) were obtained 6 μg L-1, 9.92, 0.018-0.5 mg L-1 and 0.02-2.58 mg L-1, respectively (RSD<1.1%). The validation of technology was confirmed by ICP and spiking samples.

    Keywords: Copper, Separation, Human blood, Amoxicillin, clavulanic acid, Ultrasound assisted-dispersive centrifuge liquid-liquid micro extraction
  • Azwan Morni, Seyed Mojtaba Mostafavi* Pages 63-71

    A efficient method based on 4-methylsulfanyl thiophenol (MSTP, C7H8S2) and ionic liquid ([BMIM][PF6]) was used for mercury (Hg) separation and preconcentration from wastewater of petrochemical industries. The 0.01 mile molar of MSTP, 80 mg of [BMIM][PF6] was diluted with 0.2 mL of ethanol (Et 98%). The mixture was injected to 10 mL of wastewater samples, shacked by ultrasonic bath for 5.0 min and cloudy solution was achieved by ionic liquid micelles at pH=7.0. The mercury ions was complexed with MSTP and extracted on micelles (IL/Et) by cloud point dispersive liquidliquid microextraction (CP-DLLME) at 50oC before determined by cold vapor atomic absorption spectrometry (CV-AAS). The favorite extraction for mercury with low LOD (15 ng L-1) and good linear rages (0.05- 6.2 μg L-1) was achieved (RSD<5%). The main parameters such as, pH, sample volumes, amount of MSTP, amount of IL and ultra-sonic time were optimized. The method validated by spiking samples and certified reference material (CRM, NIST) in water sample.

    Keywords: Mercury, Wastewaters, Methylsulfanyl thiophenol, Ionic liquid, Cloud point dispersive liquidliquid microextraction