M.A. Al-Rajhi

The date palm (Phoenix dactylifera L.) as a biomonitor of lead and other elements in arid environments

The date palm (Phoenix dactylifera L.) has been tested as a possible biomonitor of metal pollution in Riyadh city, Saudi Arabia. The metal content (Pb, Zn, Cu, Ni, Cr and Li) was determined for washed and unwashed leaflets collected from a wide range of sites with different degrees of metal pollution (urban, suburban, highway and industrial areas) and from a rural (control) site. Differences between washed and unwashed samples revealed that metal pollutants exist as superficial contaminants, especially levels of Pb and Zn, which varied according to the metal source. However, P. dactylifera leaflets were found to be suitable biomonitors for metal pollution in Riyadh and similar arid and semi-arid environments.

Particle size effect for metal pollution analysis of atmospherically deposited dust

The metallic compositions of 231 atmospherically deposited dust samples obtained from widely-differing environments in Riyadh city, Saudi Arabia, have been investigated in relation to the particle size distributions. Sample data are presented which show that particle size classification is very important when analysing dust samples for atmospheric metal pollution studies. By cross-correlation and comparison, it was found that the best way to express the results of the metal concentration trend was as an average of particle ratios. Correlations between the six metals studied, namely Pb, Cr, Ni, Cu, Zn and Li, were found for every particle size (eight categories) and reveal that the metal concentrations increased as the particle size decreased. On the basis of this work, it is strongly recommended that future international standards for metal pollutants in atmospherically deposited dusts should be based on particle size fractions.

Assessment of health risks from aflatoxins in rice commercialised in Riyadh, Kingdom of Saudi Arabia

This study aimed to assess the occurrence and health risk of aflatoxins (AF) in rice imported to Riyadh, Kingdom of Saudi Arabia (KSA). Rice samples (n=41) including long grain white rice (LGW), sh...

Synthesis and Characterization of an Efficient New Liquid Laser Dye Material - Chalcone (DMAPPP)

Synthesis and Characterization of an Efficient New Liquid Laser Dye Material — Chalcone (DMAPPP) A.O. Elzupirc,d,∗, K.H. Ibnaouf, H. Idriss, M.A. Ibrahem, S. Prasad , M.A. Alrajhi, M.S. AlSalhi and A.S. Alaamer Al Imam Mohammad Ibn Saud Islamic University (IMSIU), College of Science, Physics Department, P.O. Box 90950, Riyadh, 11623, Saudi Arabia Alneelain University, School of Physics, Faculty of Science and Technology, P.O. Box 12702, Khartoum, 11121 Sudan Al Imam Mohammad Ibn Saud Islamic University (IMSIU), College of Science, Committee on Radiation and Environmental Pollution Protection, Riyadh, KSA Ministry of Higher Education, Central Laboratory, Khartoum, Sudan Ministries of Higher Education and Scientific Research, Sudan Atomic Energy Commission, Khartoum, Sudan KSU Research Chair on Laser Diagnosis of Cancers, College of Science, King Saud University, Riyadh, 11451 Saudi Arabia Department of Physics and Astronomy, College of Science, Riyadh, 11451 Saudi Arabia

Proton Induced X-ray Emission Study on the Content of Whale Tooth

The use of Ion beam technique for assaying small amounts of trace elements and major elements distribution has grown rapidly in recent years. Major and minor elemental composition of teeth has been extensively studied. In this work, elements content in teeth of whale were analyzed by the Proton Induced X-ray Emission (PIXE). This work is an attempt to investigate the history of mammals different annual rings layer of whale tooth. High levels of Trace elements such as Zn and Sr were detected in the teeth. By analysis of elemental composition and evaluation of trace elements in different layer, the route of the whale movement and the status of pollution of environment were obtained. The result indicated that the technique is suitable to obtain minor and trace constituents of the teeth. The obtained results are discussed in detail and these results are compared withavailable data. The methods which are widely used in the analysis of trace elements were reported elsewhere (12). In this work, PIXE (13) was used to investigate the history of history of mammals by analyzing different annual rings layer of whale tooth. . Information about the trace elements in tooth is important for several reasons. (i) Most mammals have life spans that exceed 1 year. (ii) Information can be used for evaluation the environmental pollution in the Sea or Ocean (ii) Information also can be used to know the migration, seasons and the diets of mammals.