研究论文
刘纪阳,薛爽,张营,刘强.水相和冰相中不同pH条件下溶解性有机质对苊光降解的影响[J].环境科学学报,2021,41(5):1930-1939
水相和冰相中不同pH条件下溶解性有机质对苊光降解的影响
- Effect of dissolved organic matter on photodegradation of acenaphthene under different pH conditions in water and ice
- 基金项目：国家自然科学基金项目（No.41771503）
- 作者
- 单位
- 刘纪阳
- 辽宁大学环境学院, 沈阳 110036
- 薛爽
- 辽宁大学环境学院, 沈阳 110036
- 张营
- 辽宁大学环境学院, 沈阳 110036
- 刘强
- 辽宁大学环境学院, 沈阳 110036
- 摘要：以Suwannee River NOM（SRNOM）和Upper Mississippi River NOM（UMRNOM）两种水源溶解性有机质（DOM）为代表，利用500W高压氙灯作为光源模拟太阳光，进行室内光解实验.考察了冻融前后两种DOM在不同pH条件下的光谱特性参数及其与苊的结合常数（KDOC），同时通过苊的表观光解速率常数（KOBS）研究冰相与水相中不同pH条件下DOM对苊的光解影响，并进行了相关性分析.结果表明，无论在冰相还是水相中，苊都可以直接进行光降解，同时两种DOM均能促进苊的光解.在水相中，随着pH的升高，两种DOM的SUVA254、E2/E3、a254、a350与苊的KOBS均有上升，而KDOC则呈现下降趋势.同时KOBS与KDOC、a350及SUVA254均具有显著相关性.而冰相中，KOBS和KDOC随pH的变化趋势与水相一致，但SUVA254、E2/E3、a254、a350没有明显变化趋势.KOBS和KDOC相比于水相也有明显下降.此外.冰相中的KOBS仅与KDOC存在显著相关，而与其他参数均无相关性，这也说明冰中的光化学反应可能具有更加复杂的机制.
- Abstract：The effect of dissolved organic matter (DOM) on photodegradation of acenaphthene under different pH conditions in ice and water was studied and the apparent photolysis rate constant (KOBS) of acenaphthene was analyzed. In addition, the spectral characteristic parameters of DOM as well as the binding constant (KDOC) of DOM to acenaphthene under different pH conditions were investigated before and after freezing-thawing. The correlation analysis was also performed. Two kinds of DOM extracted in water, Suwannee River NOM(SRNOM) and Upper Mississippi River NOM (UMRNOM), were used as representatives. The results showed that acenaphthene was photodegraded directly in ice and water, and both DOM could promote the photodegradation of acenaphthene. In water, with the increase of pH, all the value of SUVA254、E2/E3、a254、a350 of two DOM and KOBS of acenaphthene increased, while KDOC showed a downward trend. Meanwhile, KOBS was significantly correlated with KDOC, a350 and SUVA254. In ice, the trend of KOBS and KDOC with pH was consistent with that of water, but there was no obvious trend of SUVA254, E2/E3, a254 and a350. Moreover, the value of KOBS and KDOC were significantly lower than that in water. In addition, the value of KOBS in ice was only significantly correlated with KDOC, but had no correlation with other parameters, which indicated that the photochemical reactions in ice might have more complex mechanisms.
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