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8375119 
Journal Article 
溶解性有机物对冰相中蒽和芘光降解的影响 
Xue, S; Sun, J; Guan, X; Zhao, S; Liu, J; Zhang, Y; Liu, Q 
2019 
Yes 
Huanjing Kexue Xuebao / Acta Scientiae Circumstantiae
ISSN: 0253-2468 
Science Press 
39 
11 
3898-3905 
Chinese 
The effect of dissolved organic matter (DOM) on the photodegradation of anthracene and pyrene in ice was evaluated by means of simulated photodegradation experiments in laboratory in this study. Four DOM samples with different origins, including Suwannee River Fulvic Acid Standard II (SRFA), Upper Mississippi River NOM (UMRN), Elliott Soil Humic Acid Standard IV (ESHA) and Leonardite Humic Acid Standard (LHA), were taken as the research objects. SRFA and UMRN are aquatic originated DOM, while ESHA and LHA are errestrial DOM. A 125 W high-pressure mercury lamp was used as the simulated light source. The results show that both anthracene and pyrene underwent direct photolysis in ice. four DOM samples had different influence on the photodegradation of anthracene and pyrene in ice. The extent of influence of aquatic originated DOM on the photodegradation of anthracene and pyrene in ice was weaker than that of errestrial DOM. The inhibition of DOM on the photodegradation of anthracene and pyrene in ice was dominated by the quenching effect. four DOM with different origins had different quenching effects on the photodegradation of anthracene and pyrene in ice. DOM exhibited greater quenching effect on the excited state of anthracene than that of pyrene. The apparent photodegradation rate constant of pyrene with DOM present in ice had an significant positive correlation with SUVA values of DOM (p<0.01). © 2019, Science Press. All right reserved. 
DOM; Ice; Inhibition mechanism; Photodegradation