University of Abidjan Cocody

Abidjan, Ivory Coast

University of Abidjan Cocody

Abidjan, Ivory Coast
SEARCH FILTERS
Time filter
Source Type

Ake Assi Y.,Central University of Costa Rica | Biego G.H.M.,University of Abidjan Cocody | Sess A.D.,Sudan University of Science and Technology | Koffi K.M.,Central University of Costa Rica | And 4 more authors.
European Journal of Scientific Research | Year: 2012

This study aimed to meet the need for a reliable method for the quantification of polycyclic aromatic hydrocarbons in fish. To this end, the standard NFV03-110 was used to validate internally a method for the determination of six polycyclic aromatic hydrocarbons (PAHs): Benzo(a)pyrene (BaP), benzo(b)fluoranthene (BbF), benzo(g,h,i)perylene (BghiP), benzo(k)fluoranthene (BkF), fluoranthene (F), indeno(1,2,3-c,d)pyrene (IcdP) in samples of fresh and smoked fish. This study was conducted in accordance with the specific requirements of the standard ISO/DIS/15753 applicable to the High Performance Liquid Chromatography. Pearson coefficients for the six PAHs ranged from 0.998 to 0.999. The limits of detection were between 0.04 μg/kg for benzo(g,h,i)perylene and 0.15 μg/kg for benzo(b)fluoranthene and benzo(k)fluoranthene. The limits of quantification varied between 0.1 μg/kg for benzo(g,h,i)perylene and 0.15 μg/kg for benzo(b)fluoranthene and benzo(k)fluoranthene. The coefficients of variation for the repeatability and reproducibility tests were less than 4% for standards at 2.5 μg/L and 5 μg/L. The recovery percentages for the tests of adequacy were close to 100%. Moreover, the compliance test revealed no significant differences between PAHs concentrations and the certified values. As a result, the method used to determine PAHs concentrations is valid. This method was then used to quantify PAHs concentrations in samples of fresh and smoked fish intended for human consumption. The concentrations measured varied from one molecule to another and according to the physiological status of the fish. © EuroJournals Publishing, Inc. 2012.


Kone M.,University of Abidjan Cocody | Illien B.,University of Reunion Island | Laurence C.,University of Nantes | Graton J.,University of Nantes
Journal of Physical Chemistry A | Year: 2011

The thermodynamics and some vibrational properties of hydrogen-bonded complexes of methanol with 23 hydrogen-bond acceptors (HBAs) have been determined in CCl 4 by FTIR spectrometry. The experimental sample contains carbon, nitrogen, oxygen, sulfur, fluorine, and chlorine organic bases and covers an energetic range of 13 kJ mol -1 in the basicity scale (-ΔG), 22 kJ mol -1 in the affinity scale (-ΔH), and 400 cm -1 in the spectroscopic scale (Δν (OH)) (from benzene to trimethylphosphane oxide and amines). The experimental results in CCl 4 are compared to those computed in the gas phase at various levels of theory. Ninety five percent of the variance of the red shift and 89% of the variance of the intensification of the OH stretching upon hydrogen bonding are explained by gas-phase B3LYP/6-31+G(d,p) calculations. However, this level does not satisfactorily explain the thermodynamic properties. Only 68% of the variance of the methanol affinity (-ΔH) is taken into account. MP2/aug-cc-pVTZ//B3LYP/6-31+G(d,p) affinity calculations raise the explanation to 77% for all HBAs and to 93% when three outliers (Me 2SO, Me 3PO, and tetrahydrothiophene) are excluded. Discrepancies are analyzed in terms of experimental errors, calculation approximations, and solvation. © 2011 American Chemical Society.


Djue N.R.,University of Abidjan Cocody | Kramoh Y.,University of Abidjan Cocody | Danho E.,University of Abidjan Cocody | Asseke D.B.,University of Abidjan Cocody
Advances and Applications in Fluid Mechanics | Year: 2014

This paper focuses on the influence of self-conversion and capture processes on the stability of close clouds cells in absence of gravity. Evidence is given that self-conversion is a stabilizing mechanism, whereas the capture process leading to droplets growth is destabilizing. Furthermore, both the analytical and numerical computation permitted to parameterize the processes and investigate the antagonist effects of the self-conversion and the capture processes on the flow stability. Along with this competition between the processes to impact the flow stability during the cloud movement, the stability diagram reveals the presence of a bifurcation curve in the mixing ratio plane representation similar to those found in Rayleigh-Bénard or Fredericks or else Brün-Väisälä mechanisms. © 2014 Pushpa Publishing House, Allahabad, India.


PubMed | University of Abidjan Cocody
Type: Journal Article | Journal: The journal of physical chemistry. A | Year: 2011

The thermodynamics and some vibrational properties of hydrogen-bonded complexes of methanol with 23 hydrogen-bond acceptors (HBAs) have been determined in CCl(4) by FTIR spectrometry. The experimental sample contains carbon, nitrogen, oxygen, sulfur, fluorine, and chlorine organic bases and covers an energetic range of 13 kJ mol(-1) in the basicity scale (-G), 22 kJ mol(-1) in the affinity scale (-H), and 400 cm(-1) in the spectroscopic scale (((OH))) (from benzene to trimethylphosphane oxide and amines). The experimental results in CCl(4) are compared to those computed in the gas phase at various levels of theory. Ninety five percent of the variance of the red shift and 89% of the variance of the intensification of the OH stretching upon hydrogen bonding are explained by gas-phase B3LYP/6-31+G(d,p) calculations. However, this level does not satisfactorily explain the thermodynamic properties. Only 68% of the variance of the methanol affinity (-H) is taken into account. MP2/aug-cc-pVTZ//B3LYP/6-31+G(d,p) affinity calculations raise the explanation to 77% for all HBAs and to 93% when three outliers (Me(2)SO, Me(3)PO, and tetrahydrothiophene) are excluded. Discrepancies are analyzed in terms of experimental errors, calculation approximations, and solvation.

Loading University of Abidjan Cocody collaborators
Loading University of Abidjan Cocody collaborators