Stability and Mobility of Napropamide Complexed with Dissolved Organic Matter in Soil Columns

• Published in: Journal of environmental quality 2000-11, Vol.29 (6), p.1856-1862
• Main Authors: Nelson, S. D., Farmer, W. J., Letey, J., Williams, C. F.
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Applied sciences; Biological and medical sciences; Biological and physicochemical properties of pollutants. Interaction in the soil; Dissolved organic matter; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Pollution; Pollution, environment geology; Soil and sediments pollution; Soil and water pollution; Soil columns; Soil organic matter; Soil science
• ISSN: 0047-2425; 1537-2537
• DOI: 10.2134/jeq2000.00472425002900060018x

The herbicide napropamide [N,N‐diethyl‐2‐(1‐naphthyloxy)propanamide] has been shown to complex with various sources of dissolved organic matter (DOM), potentially increasing the risk of ground water contamination by facilitating napropamide transport through soil. Two factors that may reduce the threat of facilitated transport of chemicals through soils are soil profile depth and soil horizon variability. Movement through the soil profile may cause herbicide complexed with DOM to break apart and readsorb to the soil. Differences in soil horizon organic matter content throughout the soil profile may also alter the potential for facilitated transport of herbicides. Napropamide was used in column studies to determine if organic matter differences in horizons and soil profile depth would reduce the risk of facilitated transport. A silt loam soil was used with and without sewage sludge amendment (SS and NoSS) to represent differences in organic matter content. Results showed that