title: Study of the bioremediation of atrazine under variable carbon and nitrogen sources by mixed bacterial consortium isolated from corn field soil in Fars province of Iran.
abstract: Atrazine herbicide that is widely used in corn production is frequently detected in water resources. The main objectives of this research were focused on assessing the effects of carbon and nitrogen sources on atrazine biodegradation by mixed bacterial consortium and by evaluating the feasibility of using mixed bacterial consortium in soil culture. Shiraz corn field soil with a long history of atrazine application has been explored for their potential of atrazine biodegradation. The influence of different carbon compounds and the effect of nitrogen sources and a different pH (5.5-8.5) on atrazine removal efficiency by mixed bacterial consortium in liquid culture were investigated. Sodium citrate and sucrose had the highest atrazine biodegradation rate (87.22%) among different carbon sources. Atrazine biodegradation rate decreased more quickly by the addition of urea (26.76%) compared to ammonium nitrate. Based on the data obtained in this study, pH of 7.0 is optimum for atrazine biodegradation. After 30 days of incubation, the percent of atrazine reduction rates were significantly enhanced in the inoculated soils (60.5%) as compared to uninoculated control soils (12%) at the soil moisture content of 25%. In conclusion, bioaugmentation of soil with mixed bacterial consortium may enhance the rate of atrazine degradation in a highly polluted soil.
authors.affiliation: Environmental Health Engineering Department, School of Health, Health Faculty, Shiraz University of Medical Sciences, Shiraz, Iran. mdehghany@sums.ac.ir
authors.forename: Mansooreh
authors.initials: M
authors.lastname: Dehghani
authors.forename: Simin
authors.initials: S
authors.lastname: Nasseri
authors.forename: Hassan
authors.initials: H
authors.lastname: Hashemi
mesh_terms: D001280:Atrazine / Q000378:metabolism*; D001673:Biodegradation, Environmental / Q000187:drug effects; D002021:Buffers; D002244:Carbon / Q000494:pharmacology; D002951:Citrates; D005240:Feasibility Studies; D005947:Glucose / Q000494:pharmacology; D006540:Herbicides / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007492:Iran; D009584:Nitrogen / Q000494:pharmacology; D000644:Quaternary Ammonium Compounds / Q000494:pharmacology; D000077559:Sodium Citrate; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*; D013213:Starch / Q000494:pharmacology; D013395:Sucrose / Q000494:pharmacology; D014508:Urea / Q000494:pharmacology; D003313:Zea mays
chemical_list: D002021:Buffers; D002951:Citrates; D006540:Herbicides; D000644:Quaternary Ammonium Compounds; D012989:Soil Pollutants; D000077559:Sodium Citrate; D013395:Sucrose; D002244:Carbon; D014508:Urea; D013213:Starch; D005947:Glucose; D009584:Nitrogen; D001280:Atrazine