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)

This study was conducted to estimate the concentration of potassium bromate (KBrO3) in 21 samples of pastries and biscuits, and the absorption of samples was measured using a (Uv-Vis spectrophotometer). The results of this research showed that the amount of potassium bromate in the samples varies according to the sample, and the highest concentration was for the sample of Major Biscuits(567.5ppm). The lowest concentration was for 44 ppm mleeha cake sample. We conclude the use of an internationally banned carcinogen and prohibited by Libyan laws, as this study revealed the presence of high concentrations of it in the tested samples.
ABUBAKER A BASHIR ATRROG(12-2021)

أجري هذا البحث لتقدير فيتامين C في العصائر الطازجة لبعض عينات الليمون والبرتقال المحلي. وتم تقدير تركيزالفيتامين بطريقة المعايرة باستخدام محلول اليود القياسي وأظهرنتائج هذا البحث أن كمية الفيتامين تختلف باختلاف العينة وحتى في عينات نفس النوع، حيث وجد أن تركيز فيتامين C بوحدة ملغ\100مل لعينتين من نفس النوعللبرتقال الدمي (37 و 76) وبرتقال أبو سرة (33 و 64) وللبرتقال الحلو (28 و 40) ولليوسفي (17 و 28) وللبرتقال المر (24.7 و 48) وللبرتقال الحامض (31 و 58) ولليمون (21 و 41) وأعلى تركيز كان لعينة البرتقال الدمي وأقل تركيز كان لعينة الليمون.
رجب علي المختار عيسى(1-2021)