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环境化学  2015 

水体中亚硝酸盐的光降解

Keywords: 亚硝酸盐,光降解,水溶液,模拟太阳光,一氧化氮

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Abstract:

一定浓度的亚硝酸盐溶液经太阳光模拟器照射一定时间后,观测溶液中亚硝酸盐的含量变化.改变溶液条件(介质、pH)和光照条件(时间、光强)等实验条件,同时进行黑暗对照实验,探求影响亚硝酸盐光解的因素和规律.结果表明,在光照的8h内,时间越长亚硝酸盐的降解率越大,基本符合一级反应动力学曲线;光照强度越大亚硝酸盐的降解程度越大,光照强度分别为765、500、250W·m-2的条件下,光化学降解一级动力学常数分别为0.0244h-1、0.0102h-1和0.0042h-1;不同介质中亚硝酸盐降解程度为Milli-Q水、去离子水>人工海水,盐度对亚硝酸盐降解有显著的影响;pH越小越有利于亚硝酸盐光解.光降解产生的一氧化氮(NO)有随亚硝酸盐浓度的增加而增加的趋势.

References

[1]  Zafiriou O C, McFarland M. Nitric oxide from nitrite photolysis in the central equatorial Pacific [J].Journal of Geophysical Research, 1981, 86(C4): 3173-3182
[2]  Zafiriou O C, True M B. Nitrite photolysis in seawater by sunlight [J].Mar Chem, 1979, 8: 9-32
[3]  祝陈坚,海水分析化学实验[M]. 青岛: 中国海洋大学出版社,2006:62
[4]  Daniels M, Meyers R V, Belardo R V. Photochemistry of the aqueous nitrate systems. 1. Excitation in the 300-rap band [J]. Phys Chem, 1968, 72: 389
[5]  Arakaki T, Miyake T, Hirakawa T, et al. pH dependent photoformation of hydroxyl radical and absorbance of aqueous- phase N(Ⅲ) (HNO2 and NO-2) [J]. Environ Sci Technol, 1999, 33: 2561-2565
[6]  Mack J, Bolton J R. Photochemistry of nitrite and nitrate in aqueous solution: a review [J]. Photochem Photobiol, A, 1999, 128:1-13
[7]  Dejam A, Kleinbongard P, Rassaf T, et al. Thiols enhance NO formation from nitrate photolysis [J]. Free Radical Biology & Medicine, 2003, 35(12): 1551-1559
[8]  Fischer M, Warneck P. Photodecomposition of nitrite and undissociated nitrous acid in aqueous solution [J]. Phys Chem, 1996, 100:18749-18756
[9]  Piotr B, Jerzy S, Eulalla O. Oxygen consumption in two aqueous systems: excited nitrite ions-oxygen and nitrite ions-singlet oxygen [J]. Photochem Photobiol A, 1988, 45: 269-288
[10]  Gr?tzel V M, Taniguchi S, Henglein A, et al. Pulse radiolytic investigation of the hydrolysis of dirhodan [J]. Phys Chem, 1970, 74: 1003-1010
[11]  Zellner R, Exner M, Herrmann H. Absolute OH quantum yields in the laser photolysis of nitrate, nitrite and dissolved H2O2 at 308 and 351 nm in the temperature range 278—353 K [J]. Journal of Atmospheric Chemistry, 1990, 10: 411-425
[12]  Zhou X, Mopper K. Determination of photochemically producedhydroxyl radicals in seawater and freshwater [J]. Mar Chem, 1990, 30: 71-88
[13]  刘春颖,张正斌,邢磊,等.一氧化氮的海洋生物地球化学[J].中国海洋大学学报,2004,34(Sup.):19-22
[14]  Zafiriou O C. Geochemical cycles: Laughing gas from leaky pipes [J]. Nature, 1990, 347: 6288
[15]  Mark G, Korth H G, Schuchmann H P, et al. The photochemistry of aqueous nitrate ion revised [J]. Photochem Photobiol, A, 1996, 101:89-103
[16]  Ouyang B, Dong W B, Hou H Q. A laser flash photolysis study of nitrous acid in the aqueous phase [J].Chemical Physics Letters, 2007, 402: 306-311
[17]  丰卫华,刘春颖,杨桂朋,等.化学发光法测定天然海水中一氧化氮[J]. 海洋学报,待发表
[18]  刘国光,丁雪军,张学治,等. 硝酸根对罗丹明B光解的敏化作用[J].环境化学,2003, 22(6):564-567
[19]  Minero C, Chiron S, Falletti G. Photochemincal processes involving nitrite in surface water samples [J]. Aquat Sci, 2007, 69: 71-85

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