African Journal of
Pure and Applied Chemistry

  • Abbreviation: Afr. J. Pure Appl. Chem.
  • Language: English
  • ISSN: 1996-0840
  • DOI: 10.5897/AJPAC
  • Start Year: 2007
  • Published Articles: 363

AJPAC Articles

New compounds based on anthracene as a good candidate for organic dye-sensitized solar cells: Theoretical investigations

December 2012

The specific properties of organic-conjugated molecules and polymers are of great importance since they have become the most promising materials for the optoelectronic device technology such as solar cells. The use of low band gap materials is a viable method for better harvesting of the solar spectrum and increasing its efficiency. The control of the parameter of these materials is a research issue of ongoing interest....

Author(s): N. Belghiti, M. Bennani, M. Hamidi, S. M. Bouzzine and M. Bouachrine

Determination and preconcentration of Mercury(II) from natural water and milk sample by Modified nano polyacrylonitrile fiber

December 2012

A simple method was developed for the preconcentration of Mercury(II) based on the adsorption of its Modified nano polyacrylonitrile fiber (PANF) complex. PANF was prepared by addition of acrylic fibers to ethanolamine (EA) with different concentration solutions. The stability of a chemically Modified nano polyacrylonitrile fiber were determined especially in concentrated hydrochloric acid which was then used as a...

Author(s): Ali Moghimi and Majid Abdouss

Synthetic modification of gedunin and comparative antibacterial activity of gedunin and 7-deacetoxy-7α-hydroxygedunin potassium salt

December 2012

Gedunin, a highly oxidized triterpenoid was obtained from hexane extractive of stem wood of Entandrophragma angolense (Welw) C. D. C. of the family Meliaceae. The gedunin was dissolved in minimum methanol at 40°C and set aside in the dark for recrystallization. Pure gedunin crystals were obtained in 0.92% yield. Methanolic alkaline hydrolysis of the gedunin...

Author(s): Okhale, S. E., Amupitan, J. O., Ndukwe, I. G., Oladosu, P. O. and Okogun, J. I.

Kinetics of the adsorption of hexavalent Chromium from aqueous solutions on low cost material

December 2012

This study proposes a Jordanian Pottery (Pot-Jo) as a low cost adsorbent for the removal of chromium from aqueous solutions. The effect of contact time, initial concentration of Cr(VI), temperature and ionic strength on the adsorption of Cr(VI) onto Pot-Jo were studied and discussed. The equilibrium (qe) of adsorption of Cr(VI) onto pottery were found to be 20.287, 17.55, and 13.577 mg Cr(VI) per gram of pottery at...

Author(s): Khaldoun Al-Sou&#;od

Comparative assessment of picolinic acid with common chemical preservatives in ginger juice during storage

November 2012

In consideration of the medicinal and health benefit of picolinic acid (PA), this research work compared its effectiveness as a preservative with potassium sorbate and sodium benzoate in ginger juice. Concentration of 0.07, 0.067 and 0.073% of PA, potassium sorbate and sodium benzoate, respectively, were added to ginger juice, packed in polyethylene terephthalate (PET) bottles and stored for 12 weeks at ambient...

Author(s): Akinwande, B. A., Adeoye, I. O. and Anjorin, I. B.

Chemical composition and antimicrobial activity of the seed oil of Entandrophragma angolense (Welw) C.DC.

November 2012

The seed of Entandrophragma angolense yielded 59% oil (w/w) on extraction with n-hexane. Methylation and gas chromatography-mass spectrometry (GC-MS) analysis of the methylated seed oil of E. angolense gave 11-octadecanoic acid methyl ester as major component (43.2%). Other fatty acid methyl esters (FAMEs) detected were hexadecanoic acid methyl ester, ricinoleic acid methyl ester, stearic acid methyl...

Author(s): Abayomi T. Orishadipe, Nneka N. Ibekwe, Akinbo A. Adesomoju and Joseph I. Okogun

Distribution and temporal variation of selected heavy metals in sediment of River Osara mainstream drainage in North Central Nigeria

November 2012

The concentration levels of selected iron-ore composite heavy metals were investigated in mainstream sediment of River Osara traversing by Itakpe iron-ore deposit and mining area in North Central Nigeria. The sediment samples collected along the drainage course, up-, mid- and downstream for 24 months were digested using standard methods, and levels of Cd, Cr, Ni, Cu and Pb determined using flame atomic absorption...

Author(s): Olatunji Olatunde Stephen and Osibanjo Oladele

Extraction of mercury (II) from sample water by Schiff base-chitosan grafted multi-walled carbon nanotubes

November 2012

A functionalized Schiff base-chitosan-grafted multi-walled carbon nanotubes (S-CS-MWCNTs) material has been studied on pre-concentration and determination of trace mercury. In this process, the effects of solution pH solution, elution conditions on pre-concentration of trace mercury were studied and the effect of interfering ions was also investigated. A novel S-CS-MWCNTs solid-phase extraction adsorbent was synthesized...

Author(s): Ali Moghimi

Quantitative evaluation of the antipsoriatic activity of sausage tree (Kigelia africana)

November 2012

The antipsoriatic effect of methanol and hexane extracts of the stem, bark, leaves and fruit of Kigelia africana (sausage tree) on cell differentiation was evaluated in the modified mouse tail test for psoriasis. Histopathological studies showed that the topical application of K. africana extracts on the tails of male albino mice-induced orthokeratosis in previously parakeratotic areas of the adult...

Author(s): Folashade O. Oyedeji and Olufunsho Samuel Bankole-Ojo

Groundwater quality around new cement factory, Ibese, Ogun State, Southwest Nigeria

November 2012

Assessment of physicochemical parameters and trace metals were carried out in groundwater of Ibese town and environs, Southwest Nigeria. The mean value of pH, electrical conductivity (EC), total dissolved solid (TDS) and alkalinity (HCO32-) are 5.90 ± 0.32, 1328.00 ± 676.26 µScm-1, 664.00 ± 353.58 mgL-1 and 94.00 ± 18.55 mgL-1. The chloride concentration was found to be higher than...

Author(s): Ayedun, H., Oyede, R. T., Osinfade, B. G., Oguntade, B. K., Umar, B. F. and Abiaziem, C. V

Nitrate anion levels in water from selected wells and points along Kimondi River, Nandi

November 2012

This paper focuses on the comparative determination of nitrate anion concentration from selected wells and points along the Kimondi River using UV-Visible spectrophotometric method. The areas monitored were Tulon, Sitatunga swamp, Sironoi, Kimondi Bridge, kipchabo tea factory and Samoo. This research was to determine whether nitrate anions in water are beyond the threshold limit which is harmful to both plant and animal...

Author(s): Magut Hillary and Terer Erick Kipngetich      

Adsorption of o-nitrophenol onto nano iron oxide and alginate microspheres: Batch and column studies

October 2012

In the present study, the adsorption behavior of o-nitrophenol from aqueous medium, using nano iron oxide loaded calcium alginate beads were studied using equilibrium batch and column flow techniques. The effect of pH, adsorbent dose, contact time and temperature on adsorption capacity of the magnetic beads was investigated. The optimum pH value was defined to be 2 at temperature 30°C. The equilibrium data were...

Author(s): Anjali Soni, Alka Tiwari and A. K. Bajpai

Structural study of pyridine-2,6-dicarbohydrazide nitrate salt

October 2012

Reaction between dimethyl-2,6-pyridinedicarboxylate and anhydrous hydrazine by microwave synthesis under solvent free conditions gave pyridine-2,6-dicarbohydrazide (pdch). This compound was recrystallized in methanol at low pH condition and gave the nitrate salt of pdch. In the crystal structure of this compound, protonated pdch cations and nitrate anions are linked via...

Author(s): Mohammad Hakimi, Keyvan Moeini, Zahra Mardani and Sanaz Khorasani

The preparation of activated carbon from agroforestry waste for wastewater treatment

June 2012

The scope of this study was to produce activated carbon from local agroforestry wastes (marula fruit stones, jackalberry seeds, eembe seeds, efukwa shells and eembu seeds) and assess the efficiency of the produced carbons in removing dyes and metal ions from wastewater. Preparation of activated carbons from efukwa shells, marula fruit stones, jackalberry seeds, eembe seeds and eembu seeds are described in this study....

Author(s): Hesham R. Lotfy, Jane Misihairabgwi and Mary Mulela Mutwa  

Photolysis of 4-oxazoline-2-one derivative in diverse solvent environments

June 2012

The photolysis of 4,5-diphenyl-3-(4-methylphenyl)-4-oxazolin-2-one in benzene or cyclohexane in the presence of singlet oxygen using UV light affords benzil, N-4-methylphenyl benzamide and N,N-dibenzoyl-4-methyl aniline. When the same reaction is carried out in protic solvents, the formation of benzil, N-4-methylphenyl benzamide, N,N-dibenzoyl-4-methyl aniline  and benzoic acid  is observed. The...

Author(s): Singh I. S.

Pre-concentration and spectrophotometric determination of Co(II) by adsorption of its (E)-N1-((1-thiophen- 2- yl) ethylidene) benzene-1,2-diamine complex on an alumina column

May 2012

A simple method was developed for the pre-concentration of Co(II) based on the adsorption of its (E)-N1-((1-thiophen- 2- yl) ethylidene) benzene-1,2-diamine complex on a neutral alumina column. The influence of acidity, eluting agents, stability of the column, sample volume and interfering ions was investigated in details. The adsorbed complex could be eluted using environmentally benign polyethylene glycol (PEG 400)...

Author(s): Ali Moghimi

Study of the seasonal variations in Turag river water quality parameters

May 2012

The purpose of this study was to assess the degree of pollution of Turag river water by determining various physico-chemical parameters. Water samples were collected six times per year during wet and dry season at the following three locations: Tongi Railway Bridge, Bishwa Ijtema field and Ashulia. Most of the measured physicochemical parameters exceeded permissible limit of drinking water. The recorded pH ranged from...

Author(s): A. K. M. Lutfor Rahman, M. Islam, M. Z. Hossain and M. A. Ahsan

Production and characterization of activated carbon from selected local raw materials

May 2012

Quality indices of activated carbons from cattle bone (CB), coconut-shell (CS) and wood carbon (WC) as influenced by mode of activation (heat and acid) were studied using the non-activated carbon samples as control. Preliminary investigation was carried out to determine optimum condition for carbonization and activations. The iodine values, ash, bulk densities, moisture, hardness and porosity analysis of the samples...

Author(s): Yusufu M. I., Ariahu C. C. and Igbabul B. D.  

Physicochemical study of acemannan polysaccharide in Aloe species under the influence of soil reaction (pH) and moisture application

May 2012

Two Aloe plant species were subjected to different treatment of pH (6.0, 6.5, 7.0, and 7.5) and moisture supplements at crop coefficient (kc 0.2, 0.3, 0.4, 0.5) under cultivation practices. Aloe polysaccharide (acemannan) was found to be a major component in the leaves of Aloe plant. Acemannan is considered a major and the main active ingredient in Aloe gel. Therefore, knowledge of its chemical composition and physical...

Author(s): Jyoti Nema, S. K. Shrivastava and N. G. Mitra

Preconcentration of Ni(II) from sample water by modified poly (ethylene terephthalate)-grafted-acrylic acid/acryl amide fiber

April 2012

Modified poly (ethylene terephthalate)-grafted-acrylic acid/acryl amide fiber was prepared by adding acrylic fibers to methanolamine (PET-AA/AAm) with different concentration solutions. The stability of a chemically modified PET-AA/AAm fiber especially in concentrated hydrochloric acid which was then used as a recycling and Preconcentration reagent for further uses of modified PET-AA/AAm fiber. The application of this...

Author(s): Ali MOGHIMI and Majid Abdouss  

Theoretical study of phthalane oxidation and effect of substituents by using Hyperchem program

April 2012

The effect of substituents on the relative stabilization energy (ERS) of phthalane-X carbocations has been studied with PM3 semi-empirical molecular orbital theory. The results show that the amino group gives ERS less than zero for very big amount and that will increase stability of carbocation by π-electron donation, whereas the nitro group gives height amount of ERS more than zero and that will...

Author(s): Mohammed Oday Ezzat and Mohd Nizam Mordi  

Heavy metal accumulation in Oreochromis niloticus and Clarias gariepinus from an integrated chicken-fish system

April 2012

Accumulation of cadmium (Cd), chromium (Cr), copper (Cu), lead (Pb), manganese (Mn) and zinc (Zn) in fish from integrated laying chicken-fish ponds was investigated in order to determine the possible health risks to humans from heavy metal contamination. The 20 m2 fish ponds were stocked with Oreochromis niloticus and Clarias gariepinus in a 3:1 ratio and a stocking density of 8 fingerlings/m2....

Author(s): J. C. Nnaji, A. Uzairu, C. E.Gimba and J. A. Kagbu

Corrosion inhibition and adsorption behaviour for mild steel by Ficus glumosa gum in H2SO4 solution

April 2012

The inhibitive effect of Ficus glumosa gum (FG) for the corrosion of mild steel in H2SO4medium was evaluated using the weight loss, gasometric, thermometric and scanning electron microscopy (SEM) techniques. The results obtained revealed that FG gum gum is a good adsorption inhibitor. It inhibited the corrosion of mild steel through themechanism of chemical adsorption (the reasons are inhibition...

Author(s): Paul Ocheje Ameh, Ladan Magaji and Takuma Salihu  

Theoretical study of methyl chloride conversion over H-ZSM5 zeolite

April 2012

We note in the reaction that the main molecules included in the process and explained that the transformations (Boukratem, 1997, 2003) are CH3Cl, C2H4 and HCl. Other studies were led (Jaumain and Su, 2002; Wei et al., 2006) on the same subject. With these three elements, we constitute a mathematical development relating the thermodynamic study. The final equation what was found through the fundamentals is...

Author(s): C.  Boukratem, Y. Bouhadda and T. Fergoug

A new approach for acetylation of wood: Vinyl acetate

March 2012

The chemical modification of wood has been the subject of research for many decades. The most favoured modification reaction involves the acetylation of wood with acetic anhydride. Reacted acetate provides dimensional stability by bulking the cell wall polymers and reduces further swelling when the woods come into contact with water. In addition that chemical modification also provides biological resistance. With...

Author(s): Nilgül Özmen and Nihat Sami Çetin

Synthesis of trans-3,4-dibenzyl-2-oxo-tetrahydrofuran

March 2012

Trans-3,4-dibenzyl-2-oxo-tetrahydrofuran (6) a substituted tetrahydrofuranoid lignan was synthesized in 70% yield via the Stobbe condensation between (1) benzaldehyde  and (2) diethyl succinate. The structure was confirmed by the spectral data such as infra-red, proton magnetic resonance and mass spectrum. It has two similar but non equivalent aromatic groups which appeared at δ: 6.48 - 6.76 and 7.06 - 7.25...

Author(s): Jack I. R. and Orubite K. O.  

Evaluation on the application of immobilized konkoli (Maesopsis eminii) immobilized leaves for the removal of Pb2+, Cd2+ and Zn2+ in aqueous solution

March 2012

Calcium alginate immobilized konkoli leaves (KIL) was studied as a bio-sorbent for the sorption of Pb2+, Cd2+ and Zn2+ in aqueous solution. The sorption capacities for Pb2+, Cd2+ and Zn2+ were found to be 98.52, 90.1 and 81.34% respectively. The sorption behavior with respect to contact time, initial pH, ionic strength and initial metal ion concentration were investigated in order to determine...

Author(s): S. A. Osemeahon and D. I. Esenowo  

Comparative study of two kalanchoe species: Total flavonoid and phenolic contents and antioxidant properties

March 2012

The research was conducted to determine the antioxidant activity of two Kalanchoespecies in Ghana which are used widely for the treatment of various ailments including stroke and ulcers. The leaves were subjected to methanol and aqueous extractions for each sample. Thin layer chromatography (TLC) was performed to determine the various components in the leaves extract. The concentration of phenol and flavonoid...

Author(s): Isaac Julius Asiedu-Gyekye, Daniel Ansong Antwi, Kwasi Agyei Bugyei and Charles Awortwe

Evaluation of phytochemical and antimicrobial potentials of roots, stem-bark and leaves extracts of Eucalyptus camaldulensis

March 2012

The extracts for phytochemical screening and antimicrobial activity were carried out on dried powdered leaves, stem-bark and roots of Eucalyptus camaldulensis using ethanol and water as solvent. The results of the phytochemical screening showed that the plant parts contained saponins, tannins, phenols and glycosides. The disc diffusion method was adopted for the antimicrobial activity of the plant extracts....

Author(s): M. H. Shagal, D. Kubmarawa, K. Tadzabia and K. I. Dennis

Chemoselective 3-O-alkylation of L-ascorbic acid under phase transfer catalysis

February 2012

A detailed investigation for synthesis of chemo-selective 3-O-alkylation of L-ascorbic acid under phase transfer catalysis has been carried out. All the compounds were fully characterized by infra red (IR), NMR and microanalysis. Reaction of 5,6-O-isopropylidene-L-ascrobic acid with one equivalent of corresponding alkylating agent and tetrabutyl ammonium iodide as phase transfer catalyst in biphasic system (water:ethyl...

Author(s): Shankar Ramchandra Thopate and Santosh Rajaram Kote  

In vitro antimycobacterial studies on the leaf extracts and fractions of Pavetta crassipes K. Schum

February 2012

Tuberculosis is a major public health threat and Nigeria has the world’s fifth largest tuberculosis burden, with nearly 311,000 estimated cases annually. Mycobacterium tuberculosis, the causative organism, has acquired resistance against most of the current chemotherapy, thereby calling for the urgent development of new antituberculosis drugs. Preliminary phytochemical and antimycobacterial studies were...

Author(s): Nneka N. Ibekwe, Abayomi T. Orishadipe, Helena Boshoff, Akinbo A. Adesomoju, Joseph I. Okogun and Clifton E. Barry

Kinetic, mechanism and spectral studies of bis (dibenzoyl-methane) copper (II) complex and its adducts

February 2012

The copper (II) complex of 1, 3-diphenyl-1, 3-propanedione (dbm) and its adducts with 2, 2-bipyridine (bipy) and 1, 10-phenantroline (phen) were synthesized. They were characterized by micro analytical data, infrared and ultraviolet (UV)-visible spectra and magnetic susceptibility data. The kinetics of the formation of the complex follows a rapid pre-equilibrium in which the rate is independent of the metal...

Author(s): Mary Adelaide Oladipo, Olugbenga Solomon Bello and Adewumi Idowu Adeagbo

Synthesis and characterization of β-cyclodextrin-benzoic acid inclusion complex and grafting with cellulosic polymer

February 2012

The cyclodextrins (CDs) are well known for their ability to form inclusion complexes with various types of guest molecules, which fit partially or completely into the host CDs cavity as shown by crystallographic results. Such beneficial property of CDs has been applied in many industries, for example, foods, pharmaceuticals and agriculture. Benzoic acid (BA) has been proven to form inclusion complexes with α-CD...

Author(s): Djamila Ghemati and Djamel Aliouche

Adsorption of phenol on natural clay

January 2012

Natural clay being locally abundant and cheap material in Algéria can be easily activated to become a promising adsorbent for phenol removal from aqueous solution. The natural clay before and after activation was characterized using XRD and IR techniques. The effects of various experimental parameters, such as initial phenol concentration, temperature, pH, contact time and adsorbent done on the adsorption extent...

Author(s): M. Djebbar, F. Djafri, M. Bouchekara and A. Djafri

Effect of particle size on loading capacity and water quality in water defluoridation with 200°C calcined bauxite, gypsum, magnesite and their composite filter

January 2012

Defluoridation was carried out with bauxite, gypsum, magnesite and their composite calcined at 200°C to determine relationship between particle size, capacity and water quality, in an attempt to formulate a composite filter in the ratio of loading capacities. Particles of 0.5 to 1.0, 1.0 to 1.4, 1.4 to 2.0 and 2.0 to 3.0 mm diameter were employed in batch defluoridation. Color, hardness, pH, were determined...

Author(s): Bernard Thole, Felix Mtalo and Wellington Masamba  

Co-precipitation synthesis, physical and magnetic properties of manganese ferrite powder

January 2012

Magnetic manganese ferrite powder was synthesized via chemical co-precipitation techniques using metallic chlorides of manganese and iron. Sodium hydroxide (NaOH) base was used as precipitant agent. The calcinations were performed at 600°C for 5 h. The structural investigation of the prepared sample was performed with X-ray diffractometer (XRD) and scanning electron microscope (SEM). The crystallite size was 26.53...

Author(s): Irfan Elahi, Rabab Zahira, Kiran Mehmood, Arifa Jamil and Nasir Amin  

Evaluation of drinking water quality

January 2012

Navsari District is located in the south eastern part of Gujarat State in the coastal lowland along Purna River in India. It’s geographical coordinates are 20°51' 0" North, 72°55' 0" East. In the present study, the physico-chemical parameters of Navsari District (Gujarat, India) have been analyzed regarding their suitability for drinking purpose. The study was carried out by collection of...

Author(s): Krishna Vaidya and Mohini Gadhia  

Development of ordered and disordered macroporous silica from bagasse ash

January 2012

Silica from bagasse ash was nanostructured with templating concept, these resulted into ordered and disordered nano pores in the silica. The average pore widths were between 220.87 and 537 nm. These pores were classified as macro pores. The macro porous silica developed can be applicable in sensing, selective filtration, catalysis, drug delivery and membrane.   Key words: Silica, templating concept, macro...

Author(s): S. Oluwagbemiga Alayande, E. Olugbenga Dare, W. Babatunde Ayinde, Janet Bamigbose, P. A. Ayedun and G. Ayodeji Osinkolu  

Phytochemical and antibacterial activities of leaf extracts of Nepeta cataria

December 2011

The phytochemical screening of the dichloromethane and methanolic extracts showed presence of flavonoids (flavones and flavonols), coumarins and glycosides. These secondary metabolites are considered to be responsible for the antimicrobial activity against Staphyococcus aureus, Kliebsiella pneumoniae and Salmonella typhii. The TLC analysis of the dichloromethane extract revealed presence of 3...

Author(s): Edewor, T.  I. and Usman, L. A.

Spectrophotometric studies of charge transfer complex of 8-hydroxyquinoline with 1,4-benzoquinone

December 2011

The interaction between donor 8-hydroxyquinoline (HQ) and π - acceptor 1, 4-benzoqinone (BQ) has been studied in the solution as well as in the solid state. Infrared spectroscopic data indicate that a charge transfer interaction between the donor and acceptor are due to π → π*/ n → π* transition by the formation of radical ion pairs. In solution state, the formation constant, the extinction...

Author(s): Asmaa A. Ibrahim

Influence of pH on the uptake of toluene from water by the composite poly (4-vinylpyridinium)-maghnite

December 2011

The objective of this study is to investigate the effects of the degree of α ionization on the rate uptake of organic pollutant (toluene) by poly (4-vinylpyridinium)-maghnite. Two-step experiment was carried out where the organophilic maghnite adsorbent was prepared in the first step and toluene was adsorbed on maghnite in the second step. This material organophilic maghnite was prepared by exchanging the organic...

Author(s): M. A. Zenasni, S. Benfarhi, A. Mansri, H. Benmehdi, B. Meroufel, J. Desbrieres and R. Dedriveres

Spectrophotometric determination of cobalt (ii) in low concentrations using hydroxytriazene as selective chelating agents

December 2011

The present work describes a selective, rapid and simple spectrophotometric method for the determination of cobalt (II) at trace levels using some selected hydroxytriazene. The method is based on the reaction of hydroxytriazene at pH 5.5 to 6.2, 6.0 to 6.8, 7.1 to 7.35, 7.3 to 7.9, 6.75 to 7.25 and 7.2 to 7.75 for hydroxytriazenes no (i), (ii), (iii), (iv), (v) and (vi) respectively and ethanol media with cobalt (II) to...

Author(s): Ombaka O. and Gichumbi J. M.

Modification of some organic compounds of pharmaceutical interest

November 2011

In this article, the modification of the chemical structure of acetaminophen and ibuprofen is described. The esterification, acetaylation and hydrolysis products of acetaminophen and the nitration product of ibuprofen were prepared. The newly synthesized compounds were characterized by IR, 1H NMR and mass spectral analysis. The synthesized products will be tested and evaluated as antimicrobial...

Author(s): H. R. Lotfy, H. N. Ssematala and M. Kandawa-Schulz

Studies on the adsorption efficiency of activated carbon for pesticide vapour

November 2011

Chlorpyrifos pesticides are endocrine disruptors, inhibitors of acetyl cholinesterase, used to control pests and prime contributors to indoor pollution in retail stores. Seven selected locally sourced adsorbents; Bone charcoal (BCA), corncobs, cotton seed, kokoli, sawdust, coconut shell (CSA) and Muruchi were evaluated. Only BCA and CSA shows peaks and were further examined at adsorptive temperatures of 283, 293, 303,...

Author(s): A. J. Hotton, J. T. Barminas and S. A. Osemeahon

Study of physical chemistry on biosorption of zinc by using Chlorella pyrenoidosa

November 2011

Discharge of heavy metals from metal processing industries is known to have adverse effects on the environment. Biosorption of heavy metals by metabolically inactive biomass of microbial organisms is an innovative and alternative technology for removal of these pollutants from aqueous solution. Presence of heavy metals in the aquatic system is posing serious problems and zinc has been used in many industrials and...

Author(s): Hassan Rezaei, Satish D. Kulkarni and Praveen G. Saptarshi

Complexes of Nile Red and b- or g-cyclodextrin: A semiempirical-density functional theory-molecular dynamics route

November 2011

The association of Nile Red (NR) with b-, and g-cyclodextrins (CDs) was analyzed by semiempirical parametric method 3 (PM3), density functional theory-Becke, three-parameter, Lee-Yang-Parr hybrid functional (DFT-B3LYP/6-31G), and molecular dynamics (MD) and Langevin dynamics (LD) calculations, including annealing and molecular mechanics (MM) geometry optimization. Our results suggest that inclusion complexes...

Author(s): Ruth Hojvat, Dora A. Barbiric and Eduardo A. Castro

Syntheses and crystal structures of two o-phthalate based transition metal complexes

November 2011

We report the synthesis and the crystal structures of two complexes. The two metal complexes; (1) [Zn(bipy)2(HPht)](HPht)·H2O and (2) [Cu2(Pht)2(Bipy)2] ·4H2O (where Pht2― = dianion of o-phthalic acid, HPht― = anion of o-phthalic acid, Bipy = 2, 2′-bipyridine) have been synthesized and their crystal structures were determined by elemental analyses, IR and single crystal diffraction...

Author(s): Xuehui Zhao, Hongmei peng and Liangcai Yu

Simple and simultaneous spectrophotometric determination of Pd (II) in alloys using hydrazone compounds

November 2011

A highly selective, reproducible and rapid spectrophotometric method for the determination of palladium (II) is developed based on the reaction of Pd (II) with 2,4-dihydroxyl acetophenone-p- hydroxylbenzoylhydrazone [RPPHBH] in the pH range 5 to 6 which forms a stable pale green complex. The complex shows absorbance maximum at 375 nm at pH of 5.5. Beer’s law is obeyed in the range 1.06 to 8.51 µg/ml of...

Author(s): Malathi Challa and T. Srinivasulu Reddy

Effect of additive for efficient combustion of cracked furnace oil

November 2011

Present communication deals with evaluation of various additives, formulations and chemicals that are either commercially available or synthesized in authors’ laboratory for cracked residual fuel oil. The objective of this study is to assess the suitability of these additives and chemical components with regard to sediment and deposit inhibiting characteristics and study the effect of the additives on actual fuel...

Author(s): Arun K. Singh and Satish Kumar

Emamectin benzoate residue analysis in ground and terrestrial field water in Lahore suburban area

November 2011

High performance liquid chromatography with diode array detector was used to determine the ememactin residue in ground water in Lahore suburban area. The samples were extracted with chloroform through solvent extraction by using a separating funnel. The chemicals used were chloroform, methanol (HPLC grade) and acetonitrile (HPLC grade). Mobile phase used was acetonitrile (98%) and methanol (2%). 10 samples were analyzed...

Author(s): Sheraz Ahmed, Fahim A. Qureshi, Amjad Islam, and Ahmed Adnan  

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