Analytical Methods in Environmental Chemistry Journal 2020-02-25T08:09:26+00:00 Hamid Shirkhanloo Open Journal Systems <p>The Analytical Methods in Environmental Chemistry journal&nbsp;is a peer-reviewed journal devoted to all aspects and phases of analytical chemistry and chemical analysis. The Analytical Methods in Environmental Chemistry&nbsp;publishes articles of modern analytical chemistry, cover innovations in the analytical techniques by nanotechnology, new analytical methods in Environmental and occupational health. This includes fundamental aspects, instrumentation, new developments, innovative and novel methods and applications including environmental and clinical field. Traditional classical analytical methods such as spectrophotometry as well as established instrumentation methods such as atomic absorption spectrometry, gas chromatography, and <em>High-performance liquid chromatography</em> methods will be considered.</p> <p>&nbsp;</p> Synthesis of Bismuth Oxide: Removal of benzene from waters by Bismuth Oxide Nanostructures 2020-02-25T06:28:52+00:00 Negar Motakef Kazemi, (corresponding author) Masoumeh Yaqoubi <p>In this research, bismuth oxide (Bi<sub>2</sub>O<sub>3</sub>) nanostructures were prepared via chemical method at 90 °C for 3 h. the results samples were characterized by Fourier transform infrared (FTIR) for determination of functional groups, X-ray diffraction (XRD) for evaluation of crystal structure, dynamic light scattering (DLS), scanning electron microscope (SEM) for presentation of morphology and size, energy-dispersive X-ray spectroscopy (EDS) for determination of chemical composition, and diffuse reflection spectroscopy (DRS) for ultraviolet (UV) blocking. Also, the Bi<sub>2</sub>O<sub>3</sub> nanostructures were used for benzene extraction from waters in pH=5-7. By procedure, 30 mg of Bi<sub>2</sub>O<sub>3</sub> mixed with hydrophobic ionic liquid ([HMIM][PF6]) and injected to water samples. After shaking and centrifuging, benzene removed from water by ionic liquid-micro solid phase extraction (IL-μSPE) and determined by gas chromatography with flame ionization detector (GC-FID). The absorption capacity and recovery was obtained 167.8 mg per gram of Bi<sub>2</sub>O<sub>3 </sub>and more than 96%, respectively.</p> 2019-12-26T00:00:00+00:00 ##submission.copyrightStatement## Removal of Metanil Yellow by Batch Biosorption from Aqueous Phase on Egg Membrane: Equilibrium and Isotherm Studies 2020-02-23T19:05:19+00:00 Beniah Obinna Isiuku, (corresponding author) Francis Chizoruo Ibe <p>The biosorption of metanil yellow on hen egg membrane from aqueous solution in a batch process was investigated at 29<sup>o</sup>C with a view to determine the potential of the membrane in removing metanil yellow from aqueous solution.&nbsp; The effects of contact time, initial biosorbate concentration, biosorbent dosage and initial biosorbate pH were determined. Various isotherm models were used to analyze experimental data. The highest experimental equilibrium biosorption capacity obtained was 129.88 mg/g. The optimum pH was 3. Adsorption capacity increased with increase in initial solution concentration but decreased with increase in time. The isotherm models applied were good fits based on correlation coefficients. Flory-Huggins isotherm was the best fit (R<sup>2</sup> 0.986). The biosorption was endothermic, good, physisorptive and spontaneous. This work shows that hen egg membrane is a potential biosorbent for the removal of metanil yellow from aqueous solution.</p> 2019-12-25T00:00:00+00:00 ##submission.copyrightStatement## Enhancing the effect of zinc oxide on the absorption of heavy metals from wastewater by using silica in graphene bed 2020-02-24T05:39:40+00:00 Ahmad ghozatlu, (corresponding author) Atefeh Enayatollahi <p>In this study, the effects of nanostructure absorbent of ZnO in graphene bed for a wastewater treatment unit in weaving are evaluated. Initial analysis was undertaken to identify the existing metals and their concentration in the prepared wastewater. It was seen that the diluted solution consisted of the ambivalence ions of lead, copper, nickel, cadmium, and silver with the concentration of 73/31, 81/19, 54/6, 98/1and 76/1 milligram per liter, respectively. Trivalent chrome, with a concentration of 98/1 milligram per liter was also observed. Therefore, by adding various amounts of absorbent (20, 30 and 50 milligrams) to the wastewater sample and adjusting the PH to 5 and 6, each metal was separately absorbed.&nbsp;&nbsp;</p> 2019-12-26T00:00:00+00:00 ##submission.copyrightStatement## Speciation of arsenic (III,V) based on methyltrioctylammonium mercaptobenzoate and centrifuging dispersive liquid-liquid microextraction in water and blood samples 2020-02-24T05:33:50+00:00 Ahmad Riahi Elham Mosafa Bahareh Fahimirad, (corresponding author) <p>A novel analytical method based on centrifuging dispersive liquid-liquid microextraction (CD-LLME) procedure for pre-concentration of As (III) has been developed prior to determine by hydride generation atomic absorption spectrometry (HG-AAS). In this method, 0.1 g of a task-specific ionic liquids (methyltrioctylammonium 2-mercaptobenzoate; TOMAS; TSIL) as the extracting and complexing solvent and acetone as dispersant solvent were rapidly added into the water and blood samples at pH 4.5. The As (V) is simply calculated by difference between total concentration and inorganic forms As (III) in liquid samples. By optimizing parameters, the enrichment factor (EF) was obtained 9.8 and 49.6 for blood and water samples, respectively. The limit of detection (LOD) of 22.4 ngL<sup>-1</sup> and 4.3 ngL<sup>-1</sup> were achieved for 10 mL and 50 mL of As(III) in blood and water samples, respectively (RSD&lt;%5). The real samples were validated by certified reference material (CRM) by proposed procedure.</p> 2019-12-27T00:00:00+00:00 ##submission.copyrightStatement## Mercury determination in work place air and human biological samples based on dispersive liquid-liquid micro-extraction coupled with cold vapor atomic absorption spectrometry 2020-02-24T05:25:46+00:00 Seyed Mojtaba Mostafavi Ali Ebrahimi, (corresponding author) <p>Mercury as a Heavy metal is important factor must be determined and controlled in environmental air and biological. Mercury (Hg) accumulate in living tissues of human body. By NIOSH method, the briefing work place air of petrochemical worker was measured by cold vapor atomic absorption spectrometry(CV-AAS). For preparation and preconcentration samples before analysis a new method of dispersive liquid-liquid micro-extraction with ammonium salt of 1-pyrrolidinedithiocarbamate(APTC)combined with cold vapor atomic absorption spectroscopy, was developed.The influences of various analytical parameters including pH, APDC concentration and ionic liquid volume were investigated.Quantitative recoveries were obtained at pH 7.The enrichment factor was calculated as 5.The detection of limit(LOD)and detection of quantification(LOQ)of mercury were 0.06 and 0.2 μg L-1 respectively. In order accuracy determination the method,certified reference materials, NIST SRM 3133 Lot 061204 was analyzed and the recovery value 98% obtained. So, method of DLLME-APTC had good potential for preparation and preconcentration mercury samples before analysis.</p> 2019-12-28T00:00:00+00:00 ##submission.copyrightStatement## Removal of ethylbenzene from air by graphene quantum dots and multi wall carbon nanotubes in present of UV radiation 2020-02-25T08:09:26+00:00 Maling Gou baharak bahrami yarahmadi, (corresponding author) <p>Luminescent graphene quantum dots (GQDs) and multi wall carbon nanotubes (MWCNTs) as photocatalytic sorbent based on was used for removal of toxic ethylbenzene from air in present of UV-radiation. A novel method based on solid gas removal (SGR) based on GQDs and MWCNTs as an efficient adsorbent was used for ethylbenzene removal from air in Robson quartz tubes (RGT). After synthesized and purified of GQDs and MWCNTs, a system was designed for generation of ethylbenzene in air with difference concentrations, and then the mixture was moved to quartz tubes with UV radiation in optimized conditions. The ethylbenzene in air was absorbed on the 25 mg of GQDs or MWCNTs, desorbed from sorbent at 146<sup>o</sup>C and determined by GC-FID.</p> 2019-12-28T00:00:00+00:00 ##submission.copyrightStatement## Cadmium separation in human biological samples based on captopril-ionic liquid paste on graphite rod before determination by electrothermal atomic absorption spectrometry 2020-02-24T06:18:29+00:00 Kian Azami Mehdi Aliomrani Mostafa Dehghani Mobarake, (corresponding author) <p>A mixture of captopril nanoparticles (CAP-NPs) and ionic liquid (IL, [HMIM] [PF6]) paste on micro graphite rod (CAP-IL-MGR) and was used for separation cadmium in human serum and urine samples by micro solid phase extraction (μ-SPE). 0.01 g of CAP-NPs and 0.1 g of [HMIM] [PF6] mixed with 1 mL of acetone and mixture passed physically on micro graphite rod (MGR) at 55<sup>o</sup>C. Then, the graphite probe placed on 10 mL of human biological samples with 5 min of sonication, then cadmium ions complexed by thiol group of captopril (CAP-SH) at pH=5.5. The cadmium ions on micro probe were back extracted with 0.25 mL of nitric acid (0.5 M) which was diluted with DW up to 0.5 mL and finally, the cadmium concentration determined by ET-AAS. By optimizing of amount of captopril, the absorption capacity and recovery were obtained 132.4 mg g<sup>-1</sup> and more than 96%, respectively.</p> 2019-12-25T00:00:00+00:00 ##submission.copyrightStatement##