研究报告
季跃飞,曾超,周磊,杨曦,高士祥.阿替洛尔在模拟太阳光照射下的光解[J].环境科学学报,2012,32(6):1357-1363
阿替洛尔在模拟太阳光照射下的光解
- Photodegradation of atenolol under simulated solar irradiation
- 基金项目：国家自然科学基金项目(No. 20977045)
- 作者
- 单位
- 季跃飞
- 污染控制与资源化研究国家重点实验室,南京大学环境学院,南京 210046
- 曾超
- 污染控制与资源化研究国家重点实验室,南京大学环境学院,南京 210046
- 周磊
- 污染控制与资源化研究国家重点实验室,南京大学环境学院,南京 210046
- 杨曦
- 污染控制与资源化研究国家重点实验室,南京大学环境学院,南京 210046
- 高士祥
- 污染控制与资源化研究国家重点实验室,南京大学环境学院,南京 210046
- 摘要：以1000 W氙灯为光源,研究了阿替洛尔在模拟太阳光照射下的光降解行为,采用HPLC和SPE-LC-MS技术鉴定了阿替洛尔在250~600 nm波长照射下的主要光解产物并提出了可能的光解途径.探讨了溶液pH值、硝酸根离子浓度、腐殖质和碳酸氢根离子等因素对阿替洛尔在模拟太阳光照射下光解的影响.结果表明,阿替洛尔在模拟太阳光下的直接光解很难发生,且改变溶液pH值不能促进直接光解.而在250~600 nm波长照射下,阿替洛尔4 h光解率达42%,光解途径主要有母体羟基化和支链的断裂反应.在模拟太阳光照下,NO3-对阿替洛尔光解有显著的光敏化作用,而富里酸(SRFA)光敏化作用微弱.HCO3-抑制了模拟太阳光照下阿替洛尔在NO3-溶液中的光解,腐殖质则通过自由基淬灭和内滤机制抑制了阿替洛尔在NO3-溶液中的光解.
- Abstract：The photodegradation of atenolol was studied under simulated solar irradiation by a 1000 W xenon lamp. Photoproducts of atenolol under irradiation of 250~600 nm wavelength were identified by using HPLC and SPE-LC-MS techniques. Possible photoinduced degradation pathways were proposed. The effects of solution pH value, concentration of nitrate, presence of humic substance and bicarbonate on the photodegradation of atenolol under simulated solar irradiation were investigated. The results showed that direct photolysis of atenolol was unlikely to occur under simulated solar irradiation. Solution pH value had little effect on the kinetics of direct photolysis of atenolol. While under the irradiation of 250~600 nm wavelength, atenolol could undergo photolysis and the degradation ratio could reach 42% for 4 h irradiation. Hydroxylation of the parent compound and the cleavage of side chain were found to be the main degradation pathways. Under simulated solar irradiation, NO3- played a significant role in photosensitized degradation of atenolol, while SRFA showed limited promoting effect. It was evident that bicarbonate decreased the photodegradation of atenolol in the presence of NO3-, while humic substance inhibited the photolysis as a radical quencher and a light filter.
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