腐殖酸和铁对阿特拉津光降解影响的研究

为考察除草剂在水体中的自净性能，对模拟太阳光(λ> 290 nm)下腐殖酸和铁元素对阿特拉津的光化学降解进行了研究。结果表明，单独辐照阿特拉津几乎不降解。在分别加入3、5和10 mg/L的腐殖酸时，阿特拉津的降解率分别为34.36 %、40.74%和15.66 %；在Fe(Ⅲ)投加量从0.01 mmol/L增加到0.2 mmol/L时，阿特拉津的降解率从24.36 %增加到34.97 %。而在当腐殖酸与铁共存时，阿特拉津降解率则进一步提高。紫外可见光谱和荧光光谱均表明，腐殖酸-铁络合物的形成及其光化学作用，促进了阿特拉津的降解。

Effects of humic acid and iron on photodegradation of atrazine

To understand self-purification of herbicide in natural water body,effects of humic acid(HA) and/or iron on the photodegradation of atrazine(ATZ) under a stimulated sunlight(λ>290 nm) were investigated.The results showed that almost no degradation of atrazine was observed for the irradiation alone group.However,the degradation of atrazine reached 34.36%,40.74% and 15.66% with HA dosage of 3 mg/L,5 mg/L and 10 mg/L,respectively.With increasing Fe(Ⅲ) dosage from 0.01 mmol/L to 0.2 mmol/L,the degradation rate ranged from 24.36% to 34.97%.When adding HA and Fe(Ⅲ) simultaneously into the irradiation system,a greater degradation rate could be obtained.UV-Vis spectrum and fluorescence spectrum suggested that the formation of a complex of Fe(Ⅲ) and HA with photochemical activity was responsible for the enhancement of atrazine degradation.