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Aug 31, 2017Open    AccessArticle

Evaluation of Hexadate Ligand 1, 3-bis(2,2’:6’,2’’-Terpyridyl-5-Ylmethylsulfany l)Propane in the Determination of Iron(II) in Solution by Spectrophotometric and Fluoremetric Methods of Analysis

Philip K. Maritim
Uv-visible and fluorescence spectra of the ligand 1,3-bis(2,2’:6’,2’’-ter- pyridyl-5-ymethylsulfanyl)propane L and it’s iron(II) complex have been investigated for analytical purposes. The two spectra of L and terpy are very similar which confirmed the ability of L to co-ordinate through the six N atoms of L with minimum distortion of the metal ion’s octahedral

Aug 16, 2017Open    AccessArticle

Performance of Egg-Shell and Fish-Scale as Adsorbent Materials for Chromium (VI) Removal from Effluents of Tannery Industries in Eastern Uganda

Sam Bamukyaye, William Wanasolo
The performance of egg-shells and fish-scales biomaterials in separating chromium (VI) ions from tannery effluents obtained from tannery industries in Jinja town of Eastern Uganda was investigated. Using crushed egg-shell and fish-scales as adsorbents, sorption tests were carried out to determine the effects of bio-sorbent concentration and particle size on chromium (VI) removal. The adsorbate concentration in the tannery effluent

Mar 30, 2017Open    AccessArticle

Prediction of the Fragmentation Pathway of Atorvastatin by Using High Resolution Collision Induced Dissociation (HR-MS/MS) Spectral Information

Dev Kant Shandilya, Peter Edward Joseph, Venkata Siva Satyanarayana Kantamreddi
Introduction: A possible fragmentation pathway of atorvastatin was proposed based on rational interpretation of high resolution collision induced dissociation (CID) fragmentation spectral data. Method: The mass spectral (MS and MS/MS) data of atorvastatin was obtained by using a flow injection analysis, LC coupled with high resolution mass analyzer system with Q-TOF technology. Results: The elemental composition for

Mar 09, 2017Open    AccessArticle

Study on Extraction Technology of Polysaccharides from Jujube by Microwave Method

Minghang Xu, Xinjian Yao, Jun Wang
Jujube polysaccharide is one of the important natural active ingredients. In this paper, microwave extraction technology was utilized to extract jujube polysaccharide in different conditions using the yield as test index. The results showed that the optimum conditions were solid-liquid ratio 1:30, ultrasonic lasting time 25 min, temperature 50℃, which achieve the highest yield rate 5.38%.

Apr 21, 2016Open    AccessArticle

Analytical Procedures and Method Validation for Determination of Chlorimuron Ethyl in Sediments

Ramom Rachide Nunes, Bruno Henrique Froes Santos, Maria Olimpia de Oliveira Rezende
The present work describes the validation of an analytical method for chromatographic determination of chlorimuron ethyl herbicide (compound of sulphonylurea group) in sediments, in according with Brazilian legislation, following the guidance and normative documents of INMETRO (DOQ-CGCRE-008) and ANVISA (Resolution RE no. 899-2003). The results show that the chromatographic method demonstrated to be selective, accurate, precision and linear over the concentration range of 5.0 - 1000.0 μg·L...

Mar 08, 2016Open    AccessArticle

Physico Chemical Characterization of Tannery Effluent and Its Impact on the Nearby River

Haile Reda Amanial
A study was conducted to characterize Modjo tannery effluent (wastewater) and determine its impact on the Modjo River using some physicochemical parameters. Accordingly, three tannery wastewater samples along wastewater channel at different distances have been taken and three river water samples (one upstream and two downstream) were collected along the river to determine its impact on the river. The samples have been analyzed for temperature, pH, electrical conductivity (EC), total dissolved so...

Jan 27, 2016Open    AccessArticle

Oxygen Reduction Reaction (ORR) on Platinum Coated Nafion Membrane: Effects of Synthesis Conditions

Sakineh Chabi, Mehdi Kheirmand
The present study describes the catalytic activity of the platinum coated Nafion membranes towards oxygen reduction reaction in proton exchange membrane fuel cells. In contrast to the conventional three layered structures of the gas diffusion electrode, as-made gas diffusion electrodes are two layered in which the platinum electrocatalyst are deposited directly onto the Nafion membrane. Spin-coating method and impregnation-reduction approaches were used to synthesize Pt-coated Nafion membranes. ...

Dec 02, 2015Open    AccessArticle

Aluminum Doped ZnO Thin Films Using Chemical Spray Pyrolysis

Ramakrishnan Jayakrishnan
Aluminum doped ZnO thin films were grown using chemical spray pyrolysis. The doped films showed only blue and UV photoluminescence at room temperature. The position of the near band edge emission was found to agree with the theoretical value of ZnO nanocrystal band gap. The full width at half maximum for the near band edge emission at room temperature was found to be ~ 100 meV, which indicated films to be of very good device quality. The presence of a weak photoluminescence at 3.08 ± 0.02 eV in ...

Nov 05, 2015Open    AccessArticle

Fast and Sustainable Determination of Persistent Organic Pollutants from Organic Fertilizer Using Optimized Microwave-Assisted Extraction Method and Gas Chromatography-Mass Spectrometry

Darlan Ferreira Silva, Maria Diva Landgraf, Maria Olimpia Rezende
A microwave-assisted extraction was optimized for the evaluation of persistent organic pollutants in liquid fertilizer samples. The extraction process was defined by a 23 factorial design. The parameters (temperature and sample and solvent volume) were optimized through the response surface methodology (RSM). The data for the study were based on injection of a mix of organochlorine pesticides. In optimized conditions, the microwave-assisted extraction was carried out at 70℃ for 10 min...

Sep 21, 2015Open    AccessArticle

Investigation of Ca and Mg Removal Capability of Cactus Powder from Hard Water

Tessema Derbe, Hayelom Dargo, Worku Batu
Water that contains high amounts of Mg and Ca metals is hard water. The presence of these metal ions in water prevents the water from lather formation with soap. This leads to the consumption of large amounts of soaps which cause loss of economy. In light of the problem, this study is conducted to investigate the capability of cactus powder to remove Mg and Ca metals from hard water using FAAS. The result revealed that the concentration of both Mg and Ca metals decreased as the dose of cactus po...