Photolysis of 14C-sulfadiazine in water and manure.
Photolysis of 14C-sulfadiazine in water and manure.
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DOI：
10.1016/j.chemosphere.2007.10.045
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发表时间：
2008-03
期刊：
影响因子：
8.8
通讯作者：
P. Sukul;M. Lamshöft;S. Zühlke;M. Spiteller
中科院分区：
文献类型：
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作者：
P. Sukul;M. Lamshöft;S. Zühlke;M. Spiteller
在模拟阳光下，14c -磺胺嘧啶在水溶液中的光解反应符合一级动力学。研究了H2O2、腐植酸、黄腐酸和丙酮对磺胺嘧啶（SDZ）光降解的影响。鉴定出6种光产物：4- oh - sdz、5-OH-SDZ、n -甲酰基sdz、4-[2-亚氨基嘧啶-1(2H)-基]苯胺、2-氨基嘧啶和苯胺。在辐照过程中，so2的挤出是主要的降解过程。当土壤被肥料中含有的SDZ处理时，这些光产物可以在阳光照射下在水和土壤中发生。由于光降解，SDZ在水中的实验半衰期为32h，在光敏剂存在时，H2O2、腐殖酸、黄腐酸和丙酮的半衰期分别为19.3 ~ 31.4h、17.2 ~ 31.4h、12.6 ~ 29.8h和3.8 ~ 30.7h，取决于光敏剂的浓度。光敏剂的存在显著降低了SDZ的持久性，表明间接光解过程是控制SDZ在水环境中光降解的重要因素。调查进一步揭示了SDZ在粪便中的持续行为。SDZ在粪便中的半衰期值为158h。
Photolysis of14C-sulfadiazine in aqueous solution under simulated sunlight followed first-order kinetics. The impact of H2O2, humic acid, fulvic acid and acetone to enhance the photodegradation of sulfadiazine (SDZ) was studied. Six photoproducts, 4-OH-SDZ, 5-OH-SDZ, N-formyl-SDZ, 4-[2-iminopyrimidine-1(2H)-yl] aniline, 2-aminopyrimidine, and aniline were identified. Extrusion of SO2was found to be the main degradation process during irradiation. These photoproducts can occur in water and soil upon sunlight exposure, when soil is treated with SDZ contained in manure. Due to photodegradation the experimental half-life of the SDZ in water was 32h and in the presence of photosensitizers the half-life values were 19.3–31.4h, 17.2–31.4h, 12.6–29.8h, and 3.8–30.7h for H2O2, humic acid, fulvic acid, and acetone, respectively depending on the concentration of the photosensitizers. The presence of photosensitizers markedly reduced SDZ persistence, indicating that indirect photolytic processes are important factors governing the photodegradation of SDZ in aqueous environments. Investigation revealed further persistence behavior of SDZ in manure. The half-life value of SDZ in manure was 158h.