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  • 1 Korea Atomic Energy Research Institute 150 Dukjin-dong Yusong-gu, Daejon 305-353 Korea
  • 2 Korea University Division of Environmental Science and Ecological Engineering 5-1 Anam Dong Sungbuk-ku, Seoul 136-701 Korea
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Carbonate ions significantly inhibit the decomposition of TCE (trichloroethylene) and PCE (perchloroethylene) by gamma-rays. The inhibition effect is larger in the case of TCE than PCE due to a greater dependence of TCE decomposition on hydroxyl radicals. The inhibition effect of carbonate ions was characterized by an EPR/spin-trapping technique. The intensity of DMPO-OH adduct signal decreased as the carbonate ion concentration increased and the percent of signal reduction was linearly proportional to the logarithm of carbonate ion concentration. This directly proves that the carbonate ions inhibit the decomposition of TCE and PCE by scavenging hydroxyl radicals.