Department of Chemistry

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Department of Chemistry has more than 9 academic staff members

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خديجة السموعي هي احد اعضاء هيئة التدريس بقسم الكيمياء بكلية التربية طرابلس. تعمل السيدة خديجة السموعي بجامعة طرابلس كـمحاضر مساعد منذ 2015-12-20 ولها العديد من المنشورات العلمية في مجال تخصصها


Some of publications in Department of Chemistry

Production of Biodiesel From Waste Cooking Oil

The use of waste cooking oil for biodiesel synthesis reduces the cost of raw materials. After studying the appropriate conditions for biodiesel production in terms of the ratio of waste oil to methanol, the effect of reaction temperature, and the effect of reaction time by conducting a transesterification reaction with 1.0 %w/v sodium hydroxide as a catalyst. It was found from the analysis that the best ratio for biodiesel production is 1:3 ratio of waste oil to methanol, the best reaction temperature is at 60oC, and the best stirring time for the reaction mixture is 40 minutes. A large amount of biodiesel was prepared by applying the best conditions required to obtain the highest yield of the biodiesel, which was equal to 87.19% w/w after a five times wet washing process by 30 mL of distilled water. It was also found that the acid equivalent of biodiesel was 2.53 mg KOH /g, and biodiesel density ranged from 0.80 to 0.843 g / mL. The study proved that the biodiesel production process using waste cooking oil is technically feasible and inexpensive.
Khaled Asagheer O Hreeba(1-2022)
Publisher's website

Residual Bromate Assessment in Bread Samples from Tajoura city bakeries, Libya

A total of 25 randomly purchased bread samples were analyzed in this study from 25 different bakeries in Tajoura city. Bread in Libya is highly consumed among all socioeconomic groups; it is mainly consumed in breakfast, dinner and school meals. Potassium bromate is the most popular additive used in bakery industry worldwide. Bakeries in the US used Potassium bromate as bread improver since 1914 to increase bread volume and texture and improve bread production. The main aim of this study is to assess the safety of bread by the measurement of residual potassium bromate using a rapid and reliable method and to investigate the level of compliance to the ban fourteen years later. This method is based on the reaction between bromate and iodide in acidic medium to produce iodine (I2). The absorbance of I2 was measured spectrophotometrically at 488nm. The calibration curve was linear (R2=0.9996) over the range 1.0 – 5.0mg/L of potassium bromate. Despite the ban of potassium bromate in Libya since 2005 due to its classification as a potential carcinogen it is still detected in local bread loaves. All samples showed high levels of potassium bromate to be 300 to 1333 more than the permissible level set by the American Food and Drug Administration (FDA) which is highly toxic for consumers and could threaten their health over prolonged regular consumption. A continuous pursuance and implementation of the ban on use of potassium bromate in baking industry in Libya is recommended. arabic 11 English 67
Publisher's website

تقييم جودة مصادر المياه الجوفية في مدينة جنزور - ليبيا

In this study the quality of ground water in the city of Janzour ± Libya was studied. 27 samples of well water were collected with depths ranging between 18 - 160 m covered most areas in the city and some of their chemical properties including pH, electrical conductivity, total dissolved salts, and the concentration of nitrate, sulfate, sodium, potassium and calcium ions were determined and compared with the Libyan National Center for Standardization and Metrology. The results showed that the most samples did not exceed the maximum limit according to Libyan and world standard except W6 (Alirifi Asharif school) and W10 (Abd Aljalil Alirifi farm) which have high concentration of Sodium (200mg/l). Also noted that the amount of total dissolved salts is 50% of the samples were less than 100 mg/l which is the minimum amount according to the Libyan sta ndard.
خالد الصغير عمر حريبة(1-2018)
Publisher's website

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