Phytoremediation Of Uranium And Thorium In Some Limited Areas Old And Reclaimed Soils.

This study investigates some radioactive elements in reclaimed phosphate mine soil and old soil fertilized with phosphate by Phytoremediation using 3 types (Helianthus annuus L, Phragmites australis and Cyperus) over harvest periods of 30,45 and 60 day from start planting so as ascertain of uranium, thorium being absorbed by plant.and changes concentrations over time in different types plant, by cultivating previous plant types in pots 2 kg from 3 soil type. Two soils examined was taken from East, West Nile. The phosphate mines soil of Nasr Mining Company in Aswan governorate (reclaimed soil) that has been cultivated Wadi al-shaghb (East Nile) more than 20 years, (the reclaimed soil) and soil Sebaiya (reclaimed soil) more than 3 years of (West Nile) near phosphate crushers site. The third was taken from permanent experiment of Bahteem Agricultural Research Station Qalyubiya Governorate (old soil fertilized with Phosphate fertilizer since 1912). The plant harvested after three periods 30,45 and 60 day from cultivation of 75 pots for each sample.
The results showed that, the concentration of elements uranium and thorium was as follows.
1- The highest concentration uranium element in shoots Helianthus annuus L, was 211.3 mg kg-1 at 60-day soil Bahteem old, while lowest concentration shoots Helianthus annuus L, was 8.37 mg kg-1 at 30 day of Wadi al-shaghb.
2- The highest thorium concentration roots Cyprus was 28.8 mg kg-1 at 30 day in Wadi al-shaghb, while lowest concentration roots was 1.11 mg kg-1 roots Helianthus annuusL at 30 day in soil Wadi al-shaghb