ِAccumulation coefficient and translocation factor of heavy metals through Rhazya stricta grown in the mining area of Mahad AD'Dahab, Saudi Arabia

Conference Paper

Al-Farraj, Abdullah S. . 2010

• نوع عمل المنشور: بحث
• رابط المنشور على الويب: http://library.witpress.com/pages/PaperInfo.asp?PaperID=21283
• الوسوم: تلوث، مهد الذهب، تعدين، معادن، الحرمل
• اسم المؤتمر: Waste Management and teh Environment V
• تاريخ المؤتمر: الاثنين, تموز (يوليو) 12, 2010
• المنظمة الراعية: Wessex Institute

مستخلص المنشور

Plant species Rhazya stricta, which naturally grown around Mahad AD’Dahab Mine, have been selected to study its ability to accumulate heavy metals (Cd, Cu, Pb, Zn). Twenty four samples from roots, stems, and leaves of Rhazya stricta were collected at 0, 1, 2, 3, 4, 5, 6, and 7 km far from the landfill. Moreover, eight soil samples compost were collected from each site to collect plant samples. Plant and soil samples were analyzed for total concentration of Cd, Cu, Pb, and Zn. Results showed soil contamination with respect to Cd, Cu, Pb and Zn. The concentration of those metals was very high at near the landfill area (first and second locations) comparing with others. Therefore, enrichment factor (EF) indicated to very highly polluted (20 <EF ≤ 40) with Cd (33) and Zn (22) at the first location, whereas, EF was 8 and 10 for Cd and Zn respectively at 1km far from first location, which means a significant contamination (5 <EF ≤ 20). Furthermore, the results showed the reduction of the accumulation coefficient (<1) of heavy metals (Cd, Cu, Pb, Zn). Nevertheless, the high concentration of heavy metals in soil, reflected positively on the absorption by Rhazya stricta. Therefore, Rhazya stricta, in first and second locations, had higher concentrations of heavy metals in their roots, stems, and leaves. The study clarified that accumulation factor for Cd, Pb, and Zn was high in roots comparing with stems or leaves of Rhazya stricta. The accumulation coefficient of Cu was higher in stem followed by leaves then roots. Translocation factor of Cu from roots to stems was (0.76), while it was (0.63) for cadmium. However, based on translocation factor from stems to leaves, heavy metals can be ordered as follows: Cd> Zn> Cu> Pb. These results indicated that Rhazya stricta might not appropriate to extract heavy metals in contaminated soil, but it could be used to stabilize soil and thus prevent soil erosion, which result in reducing pollution in the surrounding areas. Also, Rhazya stricts could be used as an indicator to soil contamination with heavy metals (Cd, Cu, Pb, Zn). On other hand, the practice of providing foliage and pods as fodder for live stock should be avoided in Mahad AD’Dahab area.