المنشورات العلمية

Evaluation of Drinking Wall's Water Quality in Murzuq Basin Southwest of Libya

Abstract Groundwater is the most important water source in the study area due to its occurrence within the dry areas, therefore it became necessary to evaluate and study the quality of Murzuq basin water which located in the southern east of Libya. It is a one of the largest reservoirs in Libya, it covers 350.000 km2 containing 7700 km3 of freshwater, about 4100–13800 years old. This study investigated the quality of drinking water supplied from the Murzuq basin to the general drinking water network of Murzuq city and suburbs. A total of 10 sites were selected for water analysis. Chemical and physical parameters were determined and compared to the WHO and Libyan Standard. The results obtained from this study showed in terms of a difference in the concentrations of salts in drinking water, the pH values were between 5.50 - 7.73, while the concentration of Total dissolved salts TDS range between 54 - 1903 mg/L, the water sample of wall No. 7 exceeded the permissible limit within the specifications, the EC value is between 85 - 2970 μs/cm³, while the total hardness concentration was between 20 - 992 mg/L and there are samples of water No. 7 and No. 8 have exceeded the limits. while the calcium concentration was between 6 - 306 mg/L and the water sample No. 7 exceeded the limit, the concentration of magnesium ranged between 2 - 55 mg/L, As for the concentration of sodium, it was between 4 - 183 mg/L, and potassium was between 6 - 39 mg/L, while the concentration of chloride was between 10 - 344 mg/l where the water sample No. (8, 9) exceeded the permissible level according to specifications, and concentration values Bicarbonate ranged between 33 - 122 mg/L.
Wafa Khalleefah Amhimmid1, , (11-2020)
موقع الناشر

Audit Team Characteristics, and External Environment Audit Factors: Effects on Audit Quality in Libya

Abstract: Purpose: The paper aims to analyse audit team characteristics that were perceived to be affected on audit quality. Specifically, it focuses principally on whether audit team characteristics, i.e., independence, continuous education and training, experience and professional conduct enhances audit quality. This study examines the moderating effect of the external environment audit i.e., professional bodies, laws and regulations, and recognized standards in the relationship between audit team characteristics and audit quality. Design/methodology/approach: Multiple regression analysis is applied to examine the association between variables of the study. A questionnaire survey was conducted of 251 external auditors, by personally administered questionnaire from Libyan the Association of Accountants and Auditors (LAAA) . Findings: the audit team characteristics have positively and significantly related to audit quality. As well as the regression analysis at dimension level shows positively and significantly related to audit quality. The findings also indicate that the external environment audit factors moderates the relationship between variables of study. Practical implications: The instrument presented will provide to measure audit quality in Libya, with a practical understanding in the area of audit quality. Moreover, researchers and practitioners from other may be able to use these models in future to measure audit quality. Originality/value: This is the first study examining the impact of external environmental factors on audit quality and the findings demonstrated its moderating effect on audit quality. Keywords: Audit team characteristics, External environment audit factors, Audit quality, Libya
Fuad Elmahedi Hussein, Khaled Ali Endaya, (10-2020)
موقع الناشر

A Study of Some Specific Properties of the Irrigation Water Quality for Artesian Self-propelled Wells in Wadi Al-shatti Region in Southern Libya

Abstract This research was conducted with the purpose of studying some specific properties of irrigation water quality for artesian selfpropelled wells in Wadi Shati region in southern Libya, and assessing the quality of chemical water properties and their suitability for irrigation. This study included 10 artesian self-propelled wells where the results showed that all the chemical properties of irrigation water were within the permissible limits of the Food and Agriculture Organization of the United Nations and the American Salinity Laboratory standards. except for potassium (K) that exceeded the permissible limits, where the results showed that the (K) concentration is between 0.51-0.59 meq/L, and the values of electrical conductivity ranged between 917-1035 s/m³μ, while the total dissolved salts were between 587-662 mg/L, also the exponent values The pH is between 6.9-7.7, while the sodium (Na) concentration is between 2.48-3.09 meq/L, and the calcium (Ca) results ranged between 0.6-0.9 meq/L, and the chloride concentration ranged between 4.37 and 4.90 meq/L, and these sulphate concentrations were between 1-2.54 meq/L, while the bicarbonate concentration ranged between 1.25-1.51 meq/L, The results of the basic indicators in irrigation water indicated that the percentage of sodium ranged between 49-59%, and the rate of sodium adsorption ranged between 2.45-3.45 meq/L, and the modified sodium adsorption ratio was 3.13-4.07 meq/L and the magnesium (Mg) risk ratio 43-67%, Thereby the water studied was classified as highly salty and low in sodium risk.
Wafa Khalleefah Amhimmid1, *, Emhemmad Jumha Emhemmad2,, (9-2020)
موقع الناشر

Removal of Multi-heavy Metals from Simulated Wastewater using Hybrid Modified Carbonized Palm Shell and Rice Husk Adsorbents

It necessary to remove heavy metals from wastewater in order to comply with environmental regulations and for sake of human health and safety. The purposes of the present study was to prepare hybrid modified adsorbent from the carbonized palm shell and rice husk by physical treatment for the removal of 13 multi heavy metal component from simulated wastewater by single bed adsorption column. The Metals being studied are Cadmium, Chromium, Copper, Iron, Magnesium, Manganese, Lead, Lithium, Molybdenum, Nickel, Antimony, Vanadium and zinc. Six types of adsorbents were used for metal removal which are (100% BRH) adsorbent; (100% CPS) adsorbent , and four hybrids adsorbent prepared by mixing the blended rice husk and carbonized palm kernel shell with mixing ratios 20% , 40% , 60% , 80% wt Blended Rice Husk . The obtained results of the individual area under the graph analysis showed that cadmium, copper, lithium; vanadium elements were strongly adsorbed by hybrid adsorbents with achieved removal efficiency of 99.95%, 99.97%, 31.23%, and 89.58% with least area under the graph values of 3294.65, 2015.52, 118.231, and 115.18 respectively. As a conclusion, the mixing of blended rice husk and carbonized palm shell as hybrid adsorbent contributed to enhance the adsorption performance of cadmium, copper, lithium, vanadium, elements which demonstrated by less area under the graph values compared with pure carbonized palm shell and pure rice husk adsorbents.
Alsadek Ali Alguail, Ali Hussien Al-Eggiely, Waleed M. Omymen, (7-2020)
موقع الناشر

Audit Firm Factors, and External Environment Audit Factors: Effects on Audit Quality in Libya

Abstract: Purpose – This paper investigates in the relationship between the audit firm factors; i.e., planning, supervision, specialization in the industry, and audit firm size and audit quality. This study examines the moderating effect of the external environment audit i.e., professional bodies, laws and regulations, and recognized standards in the relationship between audit firm factors and audit quality. Design/methodology/approach – The sample comprises the external auditors from Libyan Association of Accountants and Auditors (LAAA). Data was collected 253 auditors by personally administered questionnaire. Multiple regression analysis is applied to examine the association between audit office factors and external environment audit, and audit quality. Findings – The regression analysis supported a postulate that the audit firm factors have significant positive relationship with the audit quality. But the results indicate that the external environment audit factors cannot moderate the relationship between the audit firm factors and audit quality. Originality/value – This is the first study examining the impact of external environmental factors moderating between audit firm factors and audit quality. Keywords: Audit firm factors, External environment audit factors, Audit quality, Libya.
Fuad Elmahedi Hussein, (6-2020)
موقع الناشر

Manipulation Of Marcaine As A Spinal Anesthetic Agent At The Educational Hospital Of Tarhuna

Marcaine is widely used as a local anesthetic agent in the Cesarean sections, and it acts by blocking the sodium channels. This work aims to study the effect of Marcaine as a spinal anesthetic agent, its onset, duration, and its side effects. The results of the current study showed that Marcaine has rapid onset of action. Generally, it started to achieve its purpose during the first 5 minutes of injection. In 50% of cases, the drug induced its effect by not more than sixth minute. Secondly, 40% of patients got affected by the anesthetic by the eighth the 9th and 10th minutes respectively. Marcaine has shown a long period of influence as it lasts from 2-4 hours. For instance, it continued to work for two hours in 30% of cases. But the highest ratio of effect was clearly recorded for 3 hour of injection in 50% of cases. On the other hand, only in 20% of patients the effect persisted for 4 hrs. This medication caused side effects in 86% of the cases, these side effects were headache (34% of cases), vomiting (19% of cases), hypotension 14% of cases), insomnia (14% of cases) and asthma (5% of cases). Eventually, this indicates that Marcaine has a low safety margin.
Ali Guma Azbida, Hussein Faraj Salama, Munder Mokhtar Zaid, Mohamed Mftah Zayed, (6-2020)
موقع الناشر

Manipulation Of Marcaine As A Spinal Anesthetic Agent At The Educational Hospital Of Tarhuna

Marcaine is widely used as a local anesthetic agent in the Cesarean sections, and it acts by blocking the sodium channels. This work aims to study the effect of Marcaine as a spinal anesthetic agent, its onset, duration, and its side effects. The results of the current study showed that Marcaine has rapid onset of action. Generally, it started to achieve its purpose during the first 5 minutes of injection. In 50% of cases, the drug induced its effect by not more than sixth minute. Secondly, 40% of patients got affected by the anesthetic by the eighth the 9th and 10th minutes respectively. Marcaine has shown a long period of influence as it lasts from 2-4 hours. For instance, it continued to work for two hours in 30% of cases. But the highest ratio of effect was clearly recorded for 3 hour of injection in 50% of cases. On the other hand, only in 20% of patients the effect persisted for 4 hrs. This medication caused side effects in 86% of the cases, these side effects were headache (34% of cases), vomiting (19% of cases), hypotension 14% of cases), insomnia (14% of cases) and asthma (5% of cases). Eventually, this indicates that Marcaine has a low safety margin.
Ali Guma Azbida, Hussein Faraj Salama, Munder Mokhtar Zaid, Mohamed Mftah Zayed, (6-2020)
موقع الناشر

Removal of Everzol Orange and Supra Yellow Dyes from Simulated Wastewater Using Hybrid Modified Rice Husk and Carbonized Palm Shell Adsorbents

One of the important classes of the pollutants is dyes, once they discharge in to the water receiving bodies causes several human and environmental problems. The aim of this work was to investigate the adsorption of Everzol orange 3R (EO-D), and Supra yellow RL (SY-D) dyes from synthetic waste water using hybrid modified adsorbent from blended rice husk (BRH) and carbonized palm shell (CPS) in single layer bed column adsorption study . For this purpose, six types of adsorbents were used for dyes removal which are one unmixed rice husk (100% BRH) adsorbent ; one unmixed carbonized palm kernel shell (100% CPS) adsorbent ; and four hybrid adsorbents prepared by mixing (BRH) and (CPS) with mixing ratios 20%,40%,60%,80% wt of BRH . Each adsorbent was characterized individually by elemental analysis, BET surface area, and Field Emission Scanning Electron Microscope (FESEM). Evaluating the performance of the columns was carried out by means of removal efficiency and area under the graph analysis. The result showed that, both dyes were strongly adsorbed by 0% (BRH)) with removal efficiency of 89.7%, and 96.8%, with least area under the graph of 1282, and 1164, respectively. As a conclusion, using unmixed carbonized palm shell as adsorbent for (EO-D) and (SY-D) dyes removal showed a maximum removal efficiency with least area under the graph and mixing of rice husk with CPS as a hybrid adsorbent did not reveal any beneficial effect for increasing the removal efficiency of studied dyes
Ali Hussien Al-Eggiely, Ahmed M. Bshish , Alsadek Ali Alguail , (5-2020)
موقع الناشر