Mineralization of atrazine in the river water intake and sediments of a constructed flow-through wetland

作者：Douglass James F; Radosevich Mark; Tuovinen Olli H^*

来源：Ecological Engineering, 2014, 72: 35-39.

DOI：10.1016/j.ecoleng.2014.08.016

• Anaerobic electron acceptors
• Atrazine mineralization
• Biodegradation of atrazine
• Constructed wetland
• Wetland

The purpose of this study was to assess the role of anaerobic electron acceptors in the biomineralization of atrazine in an established constructed wetland receiving seasonal fluxes of atrazine runoff from an agricultural watershed. The Olentangy River wetland receives river water with a hydraulic residence of about 36h depending on hydrological conditions. Both sediment samples and suspended solids in the water were of interest in this study. Surface water was collected from the Olentangy River by grab sampling. Samples of sediment top sections were taken from the inlet, middle section, and outlet and combined to a composite for laboratory experiments. Atrazine mineralization in water and sediment samples was based on (CO2)-C-14 release from [U-ring-C-14]-atrazine in biometer enclosures. The half-lives of atrazine mineralization by suspended solids in water ranged from 10 months to 5 years depending on incubation conditions. Sediment samples from the wetland showed considerable variation in the extent of mineralization, shortest half-life of about 7 days and the longest of about 6-7 weeks with or without an anaerobic electron acceptor. The results indicate that trace levels of atrazine entering wetland will likely persist for extended periods, often exceeding the hydrologic residence time of the wetland.

• 出版日期2014-11