Effect Of Rainwater-borne Hydrogen Peroxide On Degradation Of Atrazine In Soil

Soil-borne herbicides have brought global harm to the ecological environment.The rainwater-borne H₂O₂present in natural can efficiently degrade organic pollutants in the environment,and it is still not clear how the herbicides’degradation effect and its environmental behavior in soil.This article takes the herbicide atrazine as the research object to explore the degradation characteristics of soil atrazine by rainwater-borne H₂O₂in the southern soil environment,initially exploring the degradation mechanism of soil atrazine by rainwater-borne H₂O₂,to provide a theoretical basis and data support for the strategy and technology of environmental herbicide pollution control and treatment.There are key research findings below:1.The rainwater-borne H₂O₂in simulated precipitation can promote the degradation of soil ATR and its degradation products,and the degradation amount of soil ATR is negatively correlated with soil iron content.The experiment was divided into three groups:sterilization group,non-sterilization group and blank group,12treatments,and 3 treatments were repeated for each treatment.Compared with the non-sterilized group,the content of the added group decreased significantly by34.13%（P<0.05）;in the non-sterilized group,the added group decreased significantly by 27.41%（P<0.05）.2.Different soil conditions have an effect on the degradation of ATR and its degradation products,of which southern red soil 3（orchard soil）significantly promotes degradation compared to paddy soil 1and red soil 2（vegetable soil）（P<0.05）,the non-sterile added rainwater-borne H₂O₂group had the highest DEA content,and the increase amount relative to the unadded group reached the maximum value of the entire process,which was 236.06%.Significantly higher than the non-added group（P<0.05）.With the increase of time,the DEA gradually degraded and tended to be consistent at 30 days;the DIA content of the degradation product of the sterilized and added rainwater-borne H₂O₂group reached the maximum value at30 days（41μg/kg）,which was significantly increased compared to the non-added group.26.51%（P<0.05）.3.Ultraviolet irradiation promotes the degradation of soil ATR and its degradation products by rainwater-borne H₂O₂in simulated precipitation.The design of the experiment is:non-sterile and light-proof with H₂O₂,non-sterile and light-proof with H₂O₂,non-sterile and light-proof with no H₂O₂,non-sterile UV with no H₂O₂,sterilization Ultraviolet plus H₂O₂,sterilization and light protection without H₂O₂;sterilization UV without H₂O₂.The results showed that in the GK group at 3h,the ATR content of the UV-irradiated group was significantly reduced by 16.62%compared with the light-shielded group（P<0.05）.In the 1d GK group,the ultraviolet irradiation group decreased significantly by 9.03%（P<0.05）relative to the light-shielded group;for the DEA content,in the 10-hour FK group,the UV irradiation group increased significantly by 38.40 compared to the light-shielded group.%（P<0.05）.In the 10d FH group,FK group,and GK group,the amount of DEA generated in the light-shielding group increased significantly by 177.61%,85.60%,and 51.54%compared with the ultraviolet irradiation group（P<0.05）.In the15-day non-sterilized blank group and the sterilized and added group,the amount of DEA generated in the light-shielded group increased by 80.17%and 65.87%compared with the ultraviolet irradiation group（P<0.05）;for the DIA content,the non-sterile blank in 1 hour In the group,the DIA production of the irradiation group decreased significantly by 7.85%（P<0.05）compared with the light-shielding group;in the 15-day non-sterile addition group,the DIA production of the irradiation group decreased significantly by 28.87%（P<0.05）.In summary,rainfall rainwater-borne H₂O₂can effectively degrade soil herbicide ATR,and iron-rich orchard soil and ultraviolet light can promote the degradation of soil ATR.Considering the ecological restoration of soil herbicides,natural precipitation can be used.The micromolar H₂O₂-mediated Fenton-like reaction degrades the soil herbicide atrazine.