감마선 조사에 의한 Acetylsalicylic Acid의 분해 = Decomposition of Acetylsalicylic Acid by Gamma Ray

다국어 초록 (Multilingual Abstract)

Acetylsalicylic acid (ASA) has been issued recently in contaminated water environmentsbecause of potential impacts on ecosystem and public health. This study was aimed at investigatingthe possibility of ASA degradation using gamma ray irradiation. In addition, the use ofsodium persulfate, hydrogen peroxide, ferrous sulfate were tested in order to examine a synergisticeffect with gamma ray. The absorbed dose was ranged from 0.2 to 10 kGy and the concentrationof oxidants were from 0.1 to 10 mM in this study. The concentration of ASA was graduallydecreased corresponding to the increase of the absorbed dose. When soudium persulfate wassimultaneously applied, most of the parent compound was completely degraded even at a low doseof 0.8 kGy. The removal efficiency of total organic carbon was 90% even at the highest dose of 10kGy without sodium persulfate. However, the efficiency was dramatically enhanced up to 98% atthe same dose by adding 10 mM of oxidants. It was suggested that hydroxyl radical (OH∙) andsulfate radical (SO4-∙) were formed in the system and made roles in degrading ASA at the sametime.