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Volume 7, No. 4, December 2012, Safar 1434 H 

Articles

 

 

A Study of theThermal C-C and C-H Bond Cleavage in the Aromatic Molecules: Acenaphthene and Acenaphthylene

The thermal decomposition of the two aromatic hydrocarbons Acenaphthene and Acenaphthylene is studied applying the open shell semiempirical (Hartree-Fock) PM3 method. In this study all internal coordinates were varied, except the coordinate chosen to describe the reaction. All possible intermediates were considered on describing the reaction scheme. The preferred reaction path was assigned on the basis of comparing the activation energies of the different paths. The treatment shows that the preferred reaction paths lead to the formation of acetylene as a final product. This result is similar, but in the reverse direction, to former theoretical and experimental results reported in the literature, which showed that acetylene is a basic building unit within the natural formation reactions of Polycyclic Aromatic Hydrocarbon molecules.

 

 

Muthana Shanshal*
and Hassan H. Abdullah

JJC, 2012, 7(4), 329-337

The Chemical Speciation of Trace-Metals in Street Dusts of Irbid, Jordan

Street dust samples were collected from different locations in Irbid city, Jordan. The concentrations of Pb, Cu, Zn, Cd, Ni, Mn, Cr and Al in these samples were determined using Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES) after chemical fractionation according to the modified Community Bureau of Reference (BCR) sequential extraction procedure. The street dusts were sequentially extracted into three operationally defined fractions; exchangeable and bound to carbonates, bound to Fe-Mn oxides and residual. The order of bioavailability of measured elements (exchangeable and bound to carbonates) is found to follow the order: Zn > Cu > Mn > Cd > Pb > Ni > Cr > Al. However, the relative abundance of the metals in mobile phases of the samples based on the sum of acid-extractable and oxidizable fractions are in the following sequence: Pb (96.2%) > Mn (92.9%) > Zn (77.2%) > Cu (76.3%) > Cd (65.7%) > Ni (44.5%) > Cr (33.4%) > Al (28.4%). Enrichment factor calculations indicated that Zn, Cu, Pb and Cd are highly enriched (EF values > 100), which indicates a widespread contamination of these elements by human sources. However, enrichments of other elements were moderate and show large variability. The highest EF values for Cr and Ni are found in the residential areas followed by the main roads.

 

 

Ahmed Alomary, Safwan M. Obeidat, Abdulrahman S. Attiyat, Adnan M. Massadeh, Talal M. Al-Momani, Idrees F. Al-momani*

JJC, 2012, 7(4), 339-348

Persistent Organic Pollutants in Soil Samples from Industrial Vicinity East of Zarqa City, Jordan

The levels of 13 Polyaromatic hydrocarbons (PAHs) and 12 Polychlorinated biphenyls (PCBs) were   determined in 23 soil samples collected from the vicinity of the Jordan petroleum refinery and Al-Hussein thermal power stations in Zarqa region. The total concentrations of PAHs were  ranged between 0.94 g/kg  (site 13) and 191 g/kg (site 19), while none of the samples was containing any of the studied PCBs. Recoveries of PAHs and PCBs were found between 82 -106% and 91-114% respectively. Precision of the method for both PAHs and PCBs, calculated as relative standard deviation (RSD) was ranged between 0.6 7%. The limit of detection for PAHs and PCBs were between 0.006- 0.070 g/kg and 0.149-0.330 g/kg respectively. The total estimated cancer risks of exposure to PAHs in the soil samples were ranged from 8.56 10-9 to 5.53 10-6. By multiplying these numbers of cancer risks of exposure to soil sample-PAHs by 106, it is possible to determine the maximum theoretical number of cancer cases per million of people. The maximum estimated cancer risks cases determined in this study (6 out of million) are well within the acceptable range of excess cancer risk specified by the US Environmental Protection Agency. In general, the studied area shows very low pollution level.

 

 

Ibrahim Tarawneh, Yahya Kusbe, Mahmoud Alawi*

JJC, 2012, 7(4), 349-363

Microwave Assisted Synthesis and Antimicrobial Activity of New Pyrazolo[5,1-c][1,2,4]triazines and Thieno[2,3-b]pyridine Derivatives

Microwave assisted synthesis of pyrazolo[5,1-c][1,2,4]triazine and thieno[2,3-b]pyridine derivatives from the reaction of diazonium chlorides with methylene active compounds and the reaction of pyridinethione derivatives with α-haloketones and α-haloesters, respectively. The preliminary assay of biological activity as antibacterial and antifungal agents was studied.

 

 

Sayed Abdelkader Ahmed and Mahmoud Al Refai*

JJC, 2012, 7(4), 365-381

A Comparison of SEM-EDS with ICP-OES for the Quantitative Elemental Determination of Algerian Mediterranean Sea Sediments

The aim of this work is to compare analytical results obtained by Inductively Coupled Plasma Optical Emission Spectroscopy ICP-OES and a Scanning Electron Microscope (SEM-EDS). Surface sediment samples used in this study were collected from the Algerian Mediterranean coasts. For ICP-OES analysis the collected sediments have been subjected to a total acid digestion.  In this study, we found that there is a good correlation between the results obtained by ICP-OES and those obtained by SEM-EDS.  Moreover, good correlation was found for each sample between SEM-EDS and ICP-OES results.  Most sample-sample correlations were very high which indicates that the results of SEM-EDS and ICP-OES are almost comparable. In order to estimate and compare the relative order (Cd, Cr, Cu, Fe, K, Na, Ni, Sr, and Zn) of metal concentrations in the samples analyzed, correlation coefficients between samples with respect to that order were calculated for ICP results and SEM results, the correlation coefficients were all positive, very high, and equal unity in the case of ICP results. This suggests that no significant anthropogenic impacts in term of pollution can be considered between our samples. Correlation coefficients between samples with respect to that order for SEM results range from 0.18 1.00. This suggests that although there is a difference in the results of the two techniques, however the results of the two techniques are almost comparable.

 

 

Ahmed Alomary*, Soraya Belhadj, Safwan Obeidat, Idrees Al-Momani and Abdulrahman Attiyat

JJC, 2012, 7(4), 383-391

Melamine Trisulfonic Acid Acetalization of Carbonyl Compounds under Solvent-Free Conditions

Melamine trisulfonic acid has been used as an efficient and recyclable catalyst for acetalization of carbonyl compounds with various alcohols. Aldehydes and ketones are rapidly transformed into acetals, and ketals at room temperature in high yields using catalytic quantities of melamine trisulfonic acid. The advantage of this method is the use of a catalyst which is inexpensive, green and stable with an easy procedure and short reaction times.

 

 

Mehdi Fallah-Mehrjardi*, Kamal Ghanemi

JJC, 2012, 7(4), 393-399

Synthesis, Crystal Structure and Properties of a New Compound, K8Nb7As7O39

 

 

Sada Fatma Chrif, Mohamed Faouzi Zid* and Ahmed Driss

JJC, 2012, 7(4), 401-412

Determination of Perindopril Erbumine in Tablets by Spectrophotometry

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Four sensitive, accurate, precise and cost-effective spectrophotometric methods (M1-M4) have been proposed for the determination of perindopril erbumine in tablet dosage forms. M1 and M2 involve the formation of colored chloroform extractable ion-pair complex of the drug with safranine O and bromothymol blue, respectively. M3 is based on the oxidation of the drug with alkaline potassium permanganate. M4 is based on ternary complex formation of the drug with molybdenum(V)thiocyanate binary complex. Under optimized experimental conditions, Beers law is obeyed in the concentration ranges of 525 μg ml-1 (M1) and 2-20 μg ml-1 (M2, M3 and M4). Analytical performances of all the methods were statistically validated.

 

 

 

Avula Prameela Rani, Chatragadda Nagalakshmi, Sunkara Bhawani, Chandra Bala Sekaran*

JJC, 2012, 7(4), 413-426