Digital Repository for Department of Chemistry

The adsorption of acid red 186(AR) onto activated carbon prepared from Libyan farms was studied, the effect of solution pH, contact time, adsorption dose and initial dye concentration was evaluated. The adsorption studied included Langmuir and Freundlish isotherms were applied to experimental results. The experimental results fitted very well to both adsorption isotherms. The mixture mono layer capacity obtained from Langmuir is q_e =7.62mg/g for activated carbon (100-45um) and q_e=7.194mg/g for activated carbon (lees than 45um).Therefore, activated carbon has the potential to be used as a low cost eco-friendly adsorbent for removal “activated carbon” dye from aqueous solution. arabic 11 English 57
ezouldeen(5-2015)

مدينة مزدة هي أحد اكبر المدن الليبية في الجبل الغربي من حيث الكثافة السكانية , تقع مدينة مزدة في منتصف الشمال الغربي من ليبيا بين خطي عرض 13.4 شمالا و 28.17 جنوبا وخطي طول 14.10 شرقا و11.40 غربا وتقع جنوب مدينة طرابلس( بحوالي 200 كم) . تعتبر المياه الجوفية هي المصدر الرئيسي للمياه في هذه المنطقة والتي يعتمد عليها السكان في تلبية جميع احتياجاتهم من شرب ، زراعة ، صناعة , بالإضافة إلى الاستخدامات الأخرى. ويوجد بها العديد من الآبار والتي يتراوح عمقها من 500 متر إلى 750 متر. في هذه الدراسة تم اختيار عدد 4 آبار منتشرة بالمنطقة لغرض تصنيف نوعية المياه وتقييم استخدامها للأغراض المختلفة. تم قياس درجة الحموضة لعينات المياه في آبار قيد الدراسة ، بالإضافة إلى تقدير العناصرالثقيلة الرئيسية في المختبر كما تم تقدير العسرة الكلية للمياه والأملاح الذائبة الكلية.كما تم اجراء الفحص الميكروبي للكشف عن إمكانية وجود البكتريا من عدمه. بينت نتائج الاختبارات المعملية للمياه الجوفية للمنطقة بأن مياهها تعتبر متدنية النوعية وغير صالحة للشرب وذلك استنادا إلى مواصفات مياه الشرب في ليبيا لسنة (2008)الصادرةعن المركز الوطني للمواصفات والمعايير القياسية , معاييرمنظمة الصحة العالمية ((WHO لسنة (2011)، منظمة والأغذية الزراعة ( FAO), وأيضا وكالة حماية البيئة الأمريكية EPA) ). arabic 112 English 0
عزالدين محمد ابراهيم(8-2020)

تضمنت الدراسة تقدير تركيز بعض العناصر الثقيلة (الرصاص Pb , النحاس uC , الكادميوم dC) في عضلات أربعة أنواع من الأسماك المجمعة من الساحل الليبي قبالة شواطئ طرابلس ومصراته وقسمت الأسماك المصطادة إلى ثلاث أطوال وأوزان مختلفة (كبير,متوسط,صغير). أجريت هذه الدراسة في فصل صيف 2019 , وأوضحت نتائج الدراسة أن تراكم العناصرالثقيلة كان في عضلات أسماك البوري أكثر من أنواع الأسماك الأخرى وكان للطول والوزن علاقة طردية في زيادة تركيز العناصر الثقيلة في عضلات هذه الأسماك إذ كانت تزداد بزيادة الطول والوزن وفي جميع الأنواع الأربعة المدروسة. وتشير النتائج إلى أن: تركيز الرصاص في عضلات أسماك ( التريليا,المرجان,الشكورفو)كانت ضمن الحدود المسموح بها حسب منظمة الصحة العالمية وحسب FAO أما عضلات أسماك البوري فقد كان تركيز الرصاص فيها أعلى من الحدود المسموح بها حسب WHO وحسب FAO. كما لوحظ أن تركيز الكادميوم في كل العينات كان ضمن الحدود المسموح بها حسب WHOوحسب FAO. أما تركيز النحاس في عضلات أسماك( البوري , الشكورفو) فقد كان أعلى من الحدود المسموح بها حسب(WHO,FAO ) أما (التريليا ,المرجان) فقد كانت ضمن الحدود المسموح بها حسب (WHO,FAO). arabic 183 English 0
عزالدين محمد ابراهيم, خديجة محمد السموعي(12-2020)

Salvia officinalis L. is a Mediterranean species, naturalized in many countries. The composition of essential oil isolated from Salvia officinalis L, wild growing in Libya, was analyzed. In this study, essential oils from fresh and dry leaves of Salvia officinalis L, Libya, were extracted with ethanol, hexane or chloroform as solvents using Soxhlet apparatus and the extracts were analyzed using gas chromatography/mass spectrometry method. Each solvent showed differences in the extraction yields between fresh and dry leaves. Physical constants of the extracts were shown variation in color, viscosity, density, PH and percentage of production between fresh and dry leaves for each solvent. GC-MS results showed that ethanol could extract the most compounds compared to hexane and chloroform from both fresh and dry leaves. In total 41, 28 and 31 compounds were identified in the essential oils of fresh and dry leaves of Salvia officinalis L using ethanol, hexane or chloroform respectively. For each solvent the number of compounds extracted from dry leaves was bigger than the number extracted from fresh leaves. arabic 33 English 104
ABUBAKER A BASHIR ATRROG, abdunnaser mohamed mohamed megrahi, Fathia Mousa H Altalhi(4-2018)

Twenty-five authentic samples of Prunus amygdalus gum samples were collected from five different locations in northwest of Libya. Different physicochemical methods were used to characterize this type of gum samples. The mean values of the moisture ranged from 12.55 to 14.93%, ash mean values 4.03 to 4.62%, pH 3.89 to 4.40, W.H.C 52.85 to 60.0%, and O.H.C 136.2 to 156.3%. Solubility of Prunus amygdalus gum showed that it had low solubility in distilled water with the mean values ranged from 20.01 to 35.40%, but it dissolved perfectly in alkali media where solubility increased to 96.3% in 0.05 M Na2CO3. The study exhibited that the mean values of cationic concentration in %(w/w) such as calcium was ranged from 0.552 to 0.585, potassium 0.402 to 0.505, iron 0.0975 to 0.1125, and sodium 0.064 to 0.079, which indicates that Ca has the highest concentration of metallic ions present. Atomic absorption method indicate that all samples contain traces of elements, Li, Cr, Mn, Ni, Zn, Pb, Hg, and Cd. The main functional groups recorded from FTIR spectrum included bands at 3293 cm-1 (O-H in carboxylic group), 1601.77 cm-1 (C=O, amide N-H bend, and C=C), 1357.53 cm-1 (CH3-, and C-O-H in- plane bending vibration), and 1025.74 cm-1 (C-O stretching). arabic 16 English 99
Aborawi M. Elgornazi, M.H. Awad, Nouri M.A. Soleiman(2-2021)

ABSTRACT The physical and chemical properties of ground water from thirty wells in Sug al Juma’a area in Tripoli, Libya were analyzed using standard methods. Ground water samples were collected from three locations (Al-Shat Road (A), Sug al Juma’a Road (B) and Arada Road (C)). The physical and chemical parameters such as pH, Total Dissolved Solids (TDS), Total Hardness (TH), Electrical Conductivity (EC), Calcium (Ca2+), Magnesium (Mg2+), Sodium (Na+), Potassium (K+), Chloride (Cl-), Sulfate (SO4 2-), Bicarbonate (HCO3 -), Nitrate (NO3 -) were analyzed to study the present status of the ground water quality. The results were compared to the Libyan Standard No. 82 for Drinking Water and the World Health Organization (WHO). The understudy samples showed significantly higher values of TDS and EC than Libyan Standard and WHO. Permissible limits which may greatly influence the health conditions of the residents of this area. It is concluded from this study that the ground water of the area needs a substantial degree of purification treatment before using for drinking and domestic purposes. arabic 8 English 56
Aburawi Elgornazi, Ali Bukhzam, Nessma Alshelmani, Nabil Bader(1-2021)

Abstract: Rheological properties of Gum Habeil collected during three seasons had been studied. Intrinsic viscosity of aqueous solution of Gum Habeil was calculated by Fedor's equation. At a low concentration of aqueous deacetylated gum solution, the G' (viscoelastic) was appeared higher than G'' (viscosity) at frequency ranged from 1 to 10 Hz, but with increases concentration of deacetylated gum solutions G'' line was trend to appear higher than G' line at low frequency region. However, a crossover of G' and G'' lines was observed as the frequencies increased to 1.26, 3.97, and 9.99 Hz for 1.5, 3, and 5% w/w of gum solutions respectively. The concentrated crude gum dispersions 12.5 and 15% w/w were exhibited viscoelastic behavior, in contrast the 10% w/w of crud gum solution in distilled water appeared G'' higher than G' with the crosslink points at the middle of frequency range. The critical concentration C* of deacetylated gum solutions in deionized water, in sodium hydroxide alone, and in alkali with addition salt were determined to be 2.34, 2.37, and 2.41 g/dl respectively. The effect of temperature on rheological behavior was also studied. arabic 8 English 57
Aborawi M. Elgornazi, M. H. Awad, Nouri M. A. Soleiman(2-2020)

Ten vinegar samples were collected from the Libyan local market in the city of Tripoli. The elements have been investigated were:As, Pb, Cu, Fe and Zn. The samples were treated and prepared according to Indian standard IS 14703-1999, and the measurements have been done by using inductively coupled plasm – atomic emission spectroscopy (ICP-AES) available in the Libyan Petroleum Institute. The analysis indicated that the concentration of Arsenic of all the samples was less than 0.02mg/kg whereas, the concentration of lead is less than 0.03mg/kg. The concentration ranges of Cu, Fe and Zn were 0.11-0.59mg/kg, 0.72-2.67mg/kg and 0.08-0.28mg/kg respectively. The concentrations of the elements AS, Pb, Cu, Fe and Zn are within the limits of a variety of standards such as Libyan, Indian and Pakistani ones. arabic 21 English 134
ABUBAKER A BASHIR ATRROG, RAGIAB ALI MOKHTAR ISSA, ِAburawi Mohammed Aburawi Algornazi(11-2020)