Analytical Sciences

Identification of Photolytical Transformation Products of Pentachlorophenol in Water

Jongki HONG,* Ž€Û¥o-Gyun KIM,* Chaejoon CHEONG,* Seung-Yong JUNG,** Mi-Ran YOO,**Kang-Jin KIM,** Tae-Kwan KIM,*** and Yoon-Chang PARK***

*Korea Basic Science Institute, 52 Eoun-Dong, Yusung-Ku, Taejeon, Korea
**Department of Chemistry, Korea University, Seoul, Korea
***Department of Chemistry, Sungkyunkwan University, Suwon, Korea

The photodegradation of pentachlorophenol in water was examined with a high-pressure mercury lamp. A number of photodegradation products of pentachlorophenol, such as less-chlorinated phenols through reductive dechlorination, and catechol and trihydroxylated products via the addition of hydroxyl radicals, were observed as major products. Moreover, polychlorinated biphenylethers, hydroxylated polychlorobiphenylethers and polychlorinated dibenzo-p-dioxins as minor products were also formed by dimerization process during the photolysis of pentachlorophenol. These compounds were identified by gas chromatography-mass spectrometry. The degradation rate of PCP in water was measured against the UV-irradiation time. After the irradiation for 15 min, 75% of PCP was converted into a number of products through reductive dechlorination and oxidation. On the basis of the identified products, the photodegradation pathways of PCP under UV irradiation were proposed.

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