지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2014.1
- 수록면
- 147 - 156 (10page)
이용수
초록· 키워드
오류제보하기
Objectives: This study was carried out to examine whether the apparent photolysis with or without sensitizers[NaOH and humic acid (HA)] was prompted photodegradation of polychlorinated biphenyl (PCB) in aqueoussolution.
Methods: PCBs photodegradation occurred using fluorescence black lamps at λmax = 300 nm. PCB congenerswere exposed in 10 ppm HA or 0.05N NaOH solutions, to investigate the decreasing profile of PCBconcentration with time. The PCBs were then analyzed by gas chromatography/mass spectrometry (GC-MS).
Reductive degradation profile of PCB congeners in the presence of both sensitizers under oxygen-saturatedprotic conditions was described using the wind-rose diagrams.
Results: Use of HA or NaOH decreased PCB concentration with time in the dark and on irradiation, indicating thatphotolysis underwent through reductive dechlorination through energy transfer and possibly with reactive oxygens.
The dechlorination was marked by a chromatographic shift, observed in the GC-MS plots. Therefore it is logicalto assume that increasing the dose of sensitizers would increase the photodegradation rates of PCBs. The half-livesof pentachloro-PCB (penta-3) in 0.05N NaOH and 10 ppm HA were estimated at about 47 hours and 39 hours,respectively, under the same experimental conditions of photolysis. It was found that the rate of photolysis ofpentachloro-PCB in aqueous solution followed apparent first-order kinetics compared to other congeners.
Conclusion: Photochemical degradation (using 328 nm UV light) of penta- and hexa-PCBs in HA or alkalinesolution is a viable method for pretreatment method. The results are helpful for the further comprehension of thereaction mechanism for photolytic dechlorination of PCBs in aquatic system.
목차
등록된 정보가 없습니다.
참고문헌 (22)
참고문헌 신청
Bergman A / 2012 / A novel abbreviation standard for organobromine, organochlorine, and organophosphorus flame retardants and some characteristics of the chemicals / Environ
Capasso S / 2007 / Removal of humic substances from water by means of calcium-ion-enriched natural zeolites / Water Environ Res 79 (3) : 305 ~ 309
Carpenter DO / 2006 / Polychlorinated biphenyls (PCBs):routes of exposure and effects on human health / Rev Environ Health 21 (1) : 1 ~ 23
Chiarenzelli J / 1995 / Photodecomposition of PCBs absorbed on sediment and industrial waste:Implications for photocatalytic treatment of contaminated solids / Chemosphere 3
Christl I / 2001 / Relating ion binding by fulvic and humic acids to chemical composition and molecular size. 1. Proton binding / Environ Sci Technol 35 (12) : 2505 ~ 2511
Capasso S / 2007 / Removal of humic substances from water by means of calcium-ion-enriched natural zeolites / Water Environ Res 79 (3) : 305 ~ 309
Carpenter DO / 2006 / Polychlorinated biphenyls (PCBs):routes of exposure and effects on human health / Rev Environ Health 21 (1) : 1 ~ 23
Chiarenzelli J / 1995 / Photodecomposition of PCBs absorbed on sediment and industrial waste:Implications for photocatalytic treatment of contaminated solids / Chemosphere 3
Christl I / 2001 / Relating ion binding by fulvic and humic acids to chemical composition and molecular size. 1. Proton binding / Environ Sci Technol 35 (12) : 2505 ~ 2511
이 논문의 저자 정보
최근 본 자료
댓글(0)
0