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  Subjects -> CHEMISTRY (Total: 843 journals)
    - ANALYTICAL CHEMISTRY (51 journals)
    - CHEMISTRY (594 journals)
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CHEMISTRY (594 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 34)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 18)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 23)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 234)
ACS Photonics     Full-text available via subscription   (Followers: 11)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 21)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 55)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 15)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 20)
Advances in Nanoparticles     Open Access   (Followers: 15)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 17)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 2)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 67)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 27)
American Journal of Plant Physiology     Open Access   (Followers: 14)
American Mineralogist     Hybrid Journal   (Followers: 14)
Analyst     Full-text available via subscription   (Followers: 40)
Angewandte Chemie     Hybrid Journal   (Followers: 169)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 216)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 3)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 8)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 15)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Surface Science     Hybrid Journal   (Followers: 28)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 4)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 304)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 9)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 1)
Biomacromolecules     Full-text available via subscription   (Followers: 19)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 113)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 95)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 3)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 4)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 66)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 7)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 8)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 13)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 70)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 23)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 187)
Chemical Science     Open Access   (Followers: 22)
Chemical Technology     Open Access   (Followers: 16)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 8)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 58)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 26)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 6)
Chemistry & Biology     Full-text available via subscription   (Followers: 30)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 140)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 44)
Chemistry of Materials     Full-text available via subscription   (Followers: 262)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 4)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 7)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 2)
Copernican Letters     Open Access   (Followers: 1)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 60)
Dalton Transactions     Full-text available via subscription   (Followers: 22)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  
Drying Technology: An International Journal     Hybrid Journal   (Followers: 4)
Eclética Química     Open Access   (Followers: 1)
Ecological Chemistry and Engineering S     Open Access   (Followers: 3)
Ecotoxicology and Environmental Contamination     Open Access  
Educación Química     Open Access   (Followers: 1)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
EJNMMI Radiopharmacy and Chemistry     Open Access  
Elements     Full-text available via subscription   (Followers: 3)
Environmental Chemistry     Hybrid Journal   (Followers: 7)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)
Environmental Science : Nano     Partially Free   (Followers: 1)
Environmental Toxicology & Chemistry     Hybrid Journal   (Followers: 17)

        1 2 3 | Last

Journal Cover Chemistry and Materials Research
  [18 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 2224-3224 - ISSN (Online) 2225-0956
   Published by IISTE Homepage  [37 journals]
  • Journal Coverpage

    • Authors: Journal Editor
      Abstract: Journal Coverpage
      Issue No: Vol. 9
       
  • Synthesizing New Complexes Using
           [HPEBH=4-Hydroxy-N'-(1-(Pyridine-2-yl) ethylidene) Benzohydrazide)]

    • Authors: Hanin. AL-Hamoud
      Abstract: In this study, a new ligand [HPEBH=4-Hydroxy-N'-(1-(Pyridine-2-yl) ethylidene) Benzohydrazide)], and it's transition metal complexes with [NiII, CoII, and CuII ] were synthesized.The synthesis of ligand (HPEBH) was carried by the condensation of 1-(Pyridine-2-yl)ethan-1-one with 4-HydroxyBenzohydrazone .Then, the reaction of this ligand with Cobalt (II), Nickel (II), Copper (II) ions were carried out using metal chloride salt by the (2:1) molar ratio, fowr new mononuclear. complexes were obtained which have the formula [M(HPEBH)2] ; M= NiII , CoII, CuII The structures of the ligand and it's complexes were elucidated by FT-IR , U.V.–visible . Keywords: hydrazone, azometine, pyridine, metal complexes.
      Issue No: Vol. 9
       
  • A Study of the Kinetic and Mechanism of Electrochemical Reduction for Para
           Nitro Phenol, 2,4- Di Nitro Phenol , 2,4,6-Tri Nitro Phenol in HCL(0.5m)
           Medium

    • Authors: Sulaf Samir Ibrahem
      Abstract: In this study, the voltammetric behavior of 4-nitrophenol, 2,4-nitrophenol and 2,4,6-tri nitro phenol in acidic medium was investigated by cyclic voltammetry at glassy carbon electrode.The reduction of the para nitro phenol (2.10-4M) in the presence of HCL (0.5M) as supporting electrolyte reveals one irreversible peak while the reduction of the 2,4-di nitro phenol shows two irreversible current peaks and the reduction of the 2,4,6- tri nitro phenol gives three irreversible current peaks to produce the derivatives amines as the final products Keywords: Polarography, Cyclic voltammetry, Glassy carbon electrode (GCE), 4-nitro phenol, 2,4-di nitro phenol , 2,4,6 tri nitro phenol
      Issue No: Vol. 9
       
  • Response of Kale (Brassica Oleracea L) Crop to cyanobacterial
           Biofertilizer in Ziway Area, Ethiopia

    • Authors: Eshetu Gebre, Tulu Degefu, Endalkachew Wolde-Meskel, Alemu Lelago, Jessica Davis
      Abstract: Gradual soil fertility depletion is resulted in declining agricultural production and  productivity  generally in Ethiopia. It is obviously understood that commercial fertilizers have helped to improve yield of crops. Use of this inputs among smallholder farmers are very low in the study area due to higher costs, accessibility and crop nutritional quality reduction. This experiment was conducted to evaluate the effect of cyanobacterial biofertilizer on yield and nutritional quality of kale (Brassica Oleracea L.) crop in Ziway. Five treatments: liquid cyanobacterial, dry cyanobacteria, urea, cattle manure and control were laid out in RCBD with three replications. All necessary data from each experimental treatment were collected and subjected to analysis of variance (ANOVA).The results showed that plant height, leaf number and leaf nitrogen have increased when liquid cyanobacterial biofertilizer was applied by 13.97cm, 2.68, and 3.07% over the control, respectively whereas the application of dry cyanobacterial biofertilizer has increased the plant shoot fresh weight, shoot dry weight, leaf area, Leaf phosphorus and plant beta carotene by  341.8 g, 26.8g, ,2089.1 cm, 2 2.43 g, , 0.187 mg kg-1 and 0.9 µg/g over the control, respectively. Therefore, the use of cyanobacterial as a biofertilizer should be recommended as an alternative source of inorganic N fertilizer to increase yield and nutritional quality of kale crop for medium and small-sized farms in the study area. Keywords: Anabaena spp, Biofertilizer, β-carotene content, Cyanobacteria, Kale crop and N-fixing
      Issue No: Vol. 9
       
  • Comparative Study of Influence of Anions on Thermal Behavior of nanosized
           Alumina

    • Authors: Fadia Shaheen
      Abstract: Nanoalumina precursors homogeneously precipitated from aluminum nitrate and aluminum chloride were investigated for their thermal transitions and structural transformations. From both the monovalent anionic salts under identical reaction conditions, alumina precursors derived were same i.e. pseudoboehmite but their thermal behavior was different. Pseudoboehmite prepared from nitrate was amorphous and prone to dehydroxylation and subsequent calcination while pseudoboehmite prepared from chloride had relatively higher crystallinity and delayed dehydroxylation and calcination. In case of nitrate, life duration of gamma alumina was brief i.e. up to 350oC whereas it in case of chloride it showed off at 375 and persisted up to 800oC. Consequently, complete formation of alpha alumina occurred at 1150oC in the former case while alpha phase was in process of its conversion from theta phase in this temperature regime in the latter case. DTA-TG, XRD, SEM, etc. were carried out for the characterization. Keywords: aluminum hydroxide, boehmite, pseudoboehmite, metastable polymorphs, corundum
      Issue No: Vol. 9
       
  • Effects of Liming on Physicochemical Properties and Nutrient Availability
           of Acidic Soils in Welmera Woreda, Central Highlands of Ethiopia

    • Authors: Kebede Dinkecha
      Abstract: Soil acidity is one of chemical soil degradation problems which affect productivity of the soil in Ethiopian highlands. The purpose of this research was to identify the status of soil acidity and determine the amount of lime requirement for neutralization to increase plant nutrient availability in Welmera woreda, Oromia region. More specifically the study pointed out statistically, the nutrient availability before and after liming acidic soil using paired t-test. The results indicated that the soil of study area was strongly acidic (pH < 5.3) and exchangeable acidity was from 2.86±0.01 - 3.55±0.07 cmol/Kg. The soil showed low concentration of plant nutrients (AP, TN, K, Ca, Mg) and high in micronutrients (Cu, Fe, Mn, Zn) contents. After 90 days liming in greenhouse incubation of the soils, the results showed effective neutralization of the soil, which indicated it was properly limed and the effects of soil acidity on nutrient availability was clearly observed. The concentration of all anions (AP, TN, and OC), cations (Na+, K+, Ca+2 and Mg+2) and micronutrients were found to be significantly different except TN and OC, between the soil samples for before and after liming. After limed acidic soils, anion and cations are improved their availability for plant while micronutrients are decreased from toxicity to normal condition. Keywords: Acidity, Incubation, Liming, Lime Materials, Soil pH
      Issue No: Vol. 9
       
  • A Study of Influence of Anion on Microstructural Development and Sintering
           of Nanosized Alumina

    • Authors: Fadia Shaheen
      Abstract: Nanosized alumina has been synthesized by employing two aluminum salts with monovalent anions that is aluminum nitrate and aluminum chloride as precursors under identical reaction conditions by homogeneous precipitation method. In both the cases, gelation of aluminum hydroxide occurred in comparable pH regime and produced alumina nanoparticles with comparable average particle size; however their sintering behavior and microstructure of finished products was not comparable. Nanopowders obtained from aluminum nitrate were highly consolidable and sinterable producing reasonable final densities conversely to nanopowders obtained from aluminum chloride which were less consolidable and sinterable, besides the final products showed microstructural flaws including cracks and outgrowths due to inherent passive thermal transformations of nanopowders and unavoidable interferences. DSC/TG, TDA, SEM-EDS, XRD techniques were employed to characterize the nanopowders and dense products. Keywords: Nanoalumina precursors, aluminum chloride, aluminum nitrate, sintering
      Issue No: Vol. 9
       
  • Gamma-Irradiation Improves the Photocatalytic Activity of Fe/TiO2 for
           Photocatalytic Degradation of 2-Chlorophenol

    • Authors: Karim. R. Diab, M. M. Doheim, Sawsan A. Mahmoud, S. A. Shama, H. A. El-Boohy
      Abstract: The Fe doped TiO2 abbreviated here as (Fe3) were prepared by sol-gel method. Upon doping FeTiO3 nano-composite was formed. The prepared sample was irradiated by different dosage of γ-irradiated (0.2, 0.4, 0.8 and 1.6 MGy).  The irradiated samples which abbreviated as (0.2, 0.4, 0.8 and 1.6 MGy) and non-irradiated sample which abbreviated as (Fe3)  were characterized by X-Ray Diffraction (XRD), Surface analysis, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Temperature Programmed Desorption (NH3-TPD), Raman Spectroscopy,  and UV-Vis absorption. The results show that γ-irradiation not only improves the morphological and structural changes of irritated samples, but also extended its absorption edge to the visible light region. The photocatalytic activity of the samples were tested for the photocatalytic degradation of   2-chlorophenol under simulated solar light irradiation. The photocatalytic activity of the irradiated sample using 1.6 MGY was higher than the other irradiated and non-irradiated samples. The photo-intermediate product was also studied. Keywords: Photocatalysis, TiO2, 2-chlorophenol, photocatalytic degradation, Gamma-irradiation.
      Issue No: Vol. 9
       
  • Removal of Copper and Zinc Metals from Aqueous System by Using Rice Husk
           as Low Cost Materials: Original Research

    • Authors: TEKALIGN KASA
      Abstract: In the present study the adsorption of Cu (II) and Zn (II) ions on rice husk from artificially prepared aqueous solutions of these metal ions was investigated following the batch mode adsorption procedure. Accordingly, the effects of operating parameters such as pH, contact time, and initial concentration of metal ion solution were evaluated. The results so obtained in this study indicated that the optimum conditions for the Cu(II) and Zn(II) ions adsorption were found to be as follows: pH of 6 and 7; contact times of 100 and 125 minutes; and these values were actually determined by setting the initial concentration of 50 mg/L for each metal ion solution. Upon measurements of the residual metal ion concentration using FAAS method, the percent adsorption of both Cu (II) and Zn (II) ions showed significant increase with an increase in each case of the contact time. Furthermore, it was evidently implicated that the binding process of the metal ions on the adsorbent (rice husk) could be affected by change in the pH of both metal ion solutions. In addition the experimental data were analyzed against both Langmuir and Freundlich isotherm for determining the maximum adsorption capacity of the title bioserbent with respect to each of the tested metal ions. The adsorption maxima were calculated on the basis the Langmuir isotherm and found to be 1.93 and 12.98 mg/g for Cu (II) and Zn (II) metal ions respectively. These values are suggested that the rice husk investigated in this study can have a good application potential for the removal of both metal ions (Cu (II) and Zn (II)) from aqueous solutions. In fact, the goal of this work was to develop an inexpensive, highly available, effective metal ion adsorbent from natural waste as alternative to existing commercial adsorbents. Keywords: adsorption efficiency, adsorption isotherm, batch adsorption, copper, zinc  
      Issue No: Vol. 9
       
  • Laser Induced Breakdown Spectroscopy (LIBS) for Minerals Analysis and for
           Monitoring the Change in Elemental Compositions of the Mixtures of Herbal
           Medicines

    • Authors: Yoseph Alresawum
      Abstract: In this research nutrient elements of ten Ethiopian herbal medicines promoting health advancing effect and practiced in local medicine were determined using LIBS. The LIBS analysis revealed the presence of many nutrient elements such as copper, zinc, carbon, manganese, phosphorous, calcium, magnesium, iron, sodium and potassium. In our study we have also tried to correlate the elemental compositions in the plants with their biological effects then, by using principal component analysis (PCA) we have characterized the herbal medicines with similar elemental compositions. Finally we have demonstrated the capability of LIBS to monitor the change in elemental compositions of the mixtures of herbal medicines. Keywords: herbal medicines, mineral elements analysis, PCA, LIBS
      Issue No: Vol. 9
       
  • Laser Induced Breakdown Spectroscopy (LIBS) Coupled with Multivariate
           Chemometric Method for Characterization and Quality Control of Coffee

    • Authors: Yoseph Alresawum
      Abstract: Authentication of coffee is important for ensuring reasonable competition and as a means of   protecting consumers against deception of mislabeling. Due to this there is a demand to have a fast and reliable means of measurement allowing the characterization and discrimination of coffee samples. We believe that Laser Induced Breakdown Spectroscopy (LIBS) coupled with multivariate chemometric methods is a solution for inspecting quality and adulterations of coffee. In this work seven Ethiopian export quality coffee and their ten mixtures are analyzed by using LIBS technique. Using the most relevant emission signals attempt was made to discriminate the samples and their mixtures using Principal Component Analysis (PCA). Moreover by taking each sample with its mixtures at a time we have shown the discriminating power of PCA using LIBS spectra for the detection of adulteration. We have also shown that the spectral markers for discrimination of coffee samples are Mg and Ca lines. Keywords: Coffee, spectral marker, multivariate chemometric methods, Laser Induced Breakdown Spectroscopy (LIBS)
      Issue No: Vol. 9
       
  • Comparative Effect of Concentration and Exposure Time on Corrosion
           Inhibition of Alkaloids and Tannins Extracts of Jatropha Curcas and Parkia
           Biglobosa on Mild Steel in Acidic Media

    • Authors: Agava I. Mohammed, Rukaiyat M. Said, Abubakar G. Salisu
      Abstract: Comparative corrosion inhibition of mild steel in 0.5 H2­SO4 by the total alkaloids and tannins extracted from Parkia biglobosa seed bark and Jatropha curcas stem bark was investigated using gravimetric method at 300C. Results showed that these phytocompounds inhibit the corrosion process of mild steel in the test solution and the inhibition efficiency depends on the concentration of the alkaloids and tannins as well as the exposure time. Their adsorption was found to obey the Temkin and Langmuir adsorption isotherms and this suggested that the inhibitor molecules have been spontaneously adsorbed onto the surface of mild steel through a physical adsorption mechanism. The inhibition efficiency is markedly higher in addition of alkaloid extracts when compared with that of tannins extracts.  The inhibition efficiency increased with an increase of inhibitor concentration but decreased with exposure time. Keywords: Corrosion, Inhibition, Mild steel, Alkaloids, Tannins
      Issue No: Vol. 9
       
  • Opioids: Analytical and Toxicological Aspects

    • Authors: Esaim Fadhel – Khalfa
      Abstract: A sensitive Gas chromatography- mass spectrometry (GC) method was developed and validated for determination of Morphine, Codeine, 6MAM, Normorphine, from Heroin in deceased human plasma. Gas Chromatography was accomplished with Capillary column: MS5 (0.25 x 30 m) (5% phenylmethyl siloxane), Temperature column: 150°C for 7 min- rate 15 °C min, 280°C for 12 min). Sample: 1ml of blood extracted with 4ml of diethyl ether, centrifugation and elimination of the supernatant, suspension of the biological matrix in physiologic solution. Internal standard: Nalorphine (200ng). Injection; 1 μl for stock solutions Retention time Codeine – 15.9 – 16.1, monitorated ions Codeine 371- 414- 440. Heroin (diacetylmorphine) semisynthetic derivative of morphine marketed by Bayer in 1898. Fig. 1 Usually taken intravenously, currently also nasal and inhaled (smoked). In the body is converted rapidly (10-15 min.), by deacetylation in 3-MAM and 6-MAM and then more slowly (4-6 hours) to morphine. Morphine derivative heroin has a very large volume of distribution (2-5 L / Kg); Undergoes conjugation with acid glucuronic transformed into morphine-3-glucuronide and morphine-6-glucuronide. Metabolic pathway of opiates in man: methylation (I= N-methylation, II= N-dimethylation, III=o-methylation, IV= o-demethylation). Fig. 2 Criteria of subject selection and sampling documented history of drug abuse, detectable by criterion circumstantial - medical history. Blood sampling during the course of autopsy; Autopsy performed in cases, within 20-60 hours from the discovery of the corpse. Keywords: Overdose, Morphine, Heroin, GC- mass.
      Issue No: Vol. 9
       
  • DFT and Experimental Study of Synthesis a Quinoxaline Derivative Using
           Photocatalysis

    • Authors: Kawthar Ghanoum, Adnan Kodlaa, Joumaa Merza
      Abstract: The photocatalysis synthesis of 2-methylquinoxaline 1,4-dioxide (2MQOX) was investigated by the cycloaddition reaction of Benzofurazan oxide with acetone  at 254 nm with yield 65% and the quantum yield was calculated (0.03).The structure of the resultant was elucidated by spectroscopic analysis (IR, UV, and 1H,13C NMR). A mechanism for the reaction was proposed using the density functional theory (DFT / B3LYP (6-311 + G (2d)). The molar ratio of reaction was 1: 1. Keywords: quinoxaline, density functional theory, mechanism, spectroscopic analysis.
      Issue No: Vol. 9
       
 
 
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