黄河包头段冻融期水体荧蒽残留及光降解行为  

Residue and Photodegradation of Fla in the Baotou Section of the Yellow River in Freezing-thawing Period

作　　者：张琦[1] 梅小乐[1] 南艳霞 于淑玉[1] 杨红[1] ZHANG Qi;MEI Xiaole;NAN Yanxia;YU Shuyu;YANG Hong(College of Water Conservancy and Civil Engineering,Inner Mongolia Agriculture University,Hohhot 010018,China)

机构地区：[1]内蒙古农业大学水利与土木建筑工程学院,内蒙古呼和浩特010018

出　　处：《环境科学与技术》2024年第5期71-76,共6页Environmental Science & Technology

基　　金：内蒙古自治区自然科学基金项目(2021MS04012);内蒙古自治区直属高校青年教师科研能力提升基金项目(BR230158)。

摘　　要：作者分别于流凌期、封河期及开河期,采集黄河包头段干流水体样品,分析该河段荧蒽(Fla)的残留水平及时空变异特性,通过光降解实验探究Fla的降解过程及光敏化剂对降解行为的影响。结果表明,冻融过程中8个采样断面均有Fla检出,且未超过标准值。大部分采样点Fla含量在稳定封河期及开河期较高,各个采样点Fla含量在0.05水平上具有显著性差异,S2、S5断面浓度相对较高,S4、S6和S7点浓度较低。水中Fla可以发生直接光降解,且符合一级反应动力学方程,72 h后降解率几乎达到90%。在避光进行暗反应时,Fla浓度基本不发生变化。添加丙酮、泥沙及低浓度H2O2均可抑制Fla的降解,反应仍符合一级反应动力学方程,而较高浓度的H2O2会促进Fla的光降解,且降解反应不再符合一级反应动力学方程。Water samples were collected during freezing and flowing conditions from eight sites along the Baotou section of the Yellow River.The main aims of this study were to obtain information on the fluoranthene concentrations in freezing-thaw-ing process;to determine how fluoranthene concentrations were distributed in water;to discuss the photodegradation of fluor-anthene in the water phase;to investigate the influence of light-sensitive materials(H2O2,acetone and sediment)on the photo-degradation of fluoranthene in the water phase.The results indicated that fluoranthene concentrations were relatively high at sites S2 and S5,and residue levels were lower at points S4,S6 and S7.The fluoranthene light experiment was carried out under exposure to UV light with low fluoranthene concentrations,using a light conversion function in the water and ice phase,after 72 h the concentration the degradation rate reached 90%.The degradation rates of fluoranthene in water phase were lower with acetone,sediment and low concentrations of H2O2 than without,and the fluoranthene degradation was consistent with a first-order kinetics reaction,likewise,high H2O2 concentrations promoted photoconversion.

关 键 词：黄河包头段 冻融过程 荧蒽 变异特性 光降解 

分 类 号：X522[环境科学与工程—环境工程]