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R6 AM Plant Uptake of Organic Pollutants - Processes and Modeling
(DET-1117-734891) Fate of 14C Nonylphenol (NP), Nonylphenol Tetraethoxylate (NPE4), and Nonylphenol Nonylethoxylate (NPE9) in Biosolids/Soil Systems Planted with Crested Wheatgrass.
Dettenmaier, E1, Doucette, W1, 1 Utah State University, Logan, Utah, USA
ABSTRACT- Microcosm experiments, 150 days in duration, were conducted to evaluate the fate of 14C-labeled nonylphenol (NP), nonylphenol tetraethoxylate (NPE4), and nonylphenol nonylethoxylate (NPE9) in a soil/biosolids (99.5:0.5% w/w) environment planted with crested wheatgrass (Agropyron cristatum). Three concentrations 6, 24, and 47 mg/kg dry wt of NP, NPE4 and NPE9 were examined along with unplanted and unplanted poisoned controls. A single concentration of phenol 22 mg/kg was also evaluated as a more degradable reference compound. The biosolids were obtained from a municipal wastewater treatment plant receiving industrial, commercial and domestic wastewater. The loamy sand soil (1.6 %OC) was collected from a former agricultural field. Mineralization was quantified by collecting the 14CO2 produced during the course of the study. Roots and foliar tissue were analyzed for 14C and parent compound. The extent of mineralization at the end of the study ranged from 7% for NP to 53% for phenol. No enhancement of mineralization was observed in the planted systems. 14C concentrations in the foliar tissues were proportional to the exposure concentration but were 10 times lower than concentration in the roots and 2-3 times lower than the soil.
Key words: Plant Uptake, Mineralization, Alkylphenol Ethoxylates, Microcosm
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