TAILIEUCHUNG - Decomposition of brominated organic compounds in environment water by-ray irradiation

Brominated compounds have received much attention recently because their toxic effects, including teratogenicity, carcinogenicity and neutrotoxicity, have been observed, in particular the brominated diphenyl ethers (Darnerud et al., 2001; Linda S. et al. 2003; Peter Alexander et al. 2003, Juliette Legler et al. 2003). The environmental behavior and fate of many brominated compounds are thought to be similar to those of chlorinated pollutants in the environment | Journal of Chemistry Vol. 44 5 P. 648 - 653 2006 DECOMPOSITION OF BROMINATED ORGANIC COMPOUNDS IN ENVIRONMENT WATER BY y-RAY IRRADIATION Received 4 October 2005 HOANG HOA MAI1 M. TAGUCHI2 AND T. KQJIMA2 institute for Nuclear Science Technique -Vietnam Atomic Energy Commission 2Takasaki Radiation Chemistry Research Establishment Japan Atomic Energy SUMMARY In this work decomposition of the toxic brominated compound namely 2 4 6-tribromophenol TBP in water using y-irradiation method was investigated. The TBP in aqueous solution was effectively decomposed by y-rays. Irradiation up to a dose of 300 Gy of y-rays can absolutely decompose a concentration of 25 ụM of TBP in water. OH radicals and hydrated electrons produced by radiolysis of water are main reactive species taking part in the decomposition of the TBP. The chemical-radiation yield of decomposition depends on the concentration of TBP in solution. The presence of acetone or alcohol in solution plays as scavengers of OH radicals and solvated-electrons resulting in decrease of the decomposition yield of TBP. The present of oxygen is not much effect to the efficiency of decomposition of the parent chemical. Decomposition yield of TBP depends on the concentration of TBP and pH of water. However in the range of pH from 5 - 9 the decomposition yield get the maximum value and it decreased when pH less than 4 or bigger than 9. Keywords gamma radiation radiation decomposition dose toxic brominated organic compounds endocrine instructor 2 4 6-treibromophenol OH radical solvated electron. I - INTRODUCTION Brominated compounds have received much attention recently because their toxic effects including teratogenicity carcinogenicity and neutrotoxicity have been observed in particular the brominated diphenyl ethers Darnerud et al. 2001 Linda S. et al. 2003 Peter Alexander et al. 2003 Juliette Legler et al. 2003 . The environmental behavior and fate of many brominated compounds are thought to be similar to those of .

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