Coupled Transport and Photodegradation of Napropamide in Soils Undergoing Evaporation from a Shallow Water Table

Autor:	Susan G. Donaldson, Glenn C. Miller
Rok vydání:	1996
Předmět:	chemistry.chemical_classification Base (chemistry) Chemistry Loam Environmental chemistry Soil water Evaporation Environmental Chemistry Photic zone Sorption General Chemistry Photodegradation Soil contamination
Zdroj:	Environmental Science & Technology. 30:924-930
ISSN:	1520-5851 0013-936X
Popis:	Photolysis in soils is effectively limited to the top 0.5 mm of the soil surface. Consequently, processes that move contaminants to this sunlight-irradiated zone may have a significant impact on the degree of photolysis in soils. The effect of upward transport in translocating napropamide [2-(a-naphthoxy)-N,N-diethylpropionamide] into the photic zone was examined using an experimental system in which soils were supplied with water at their base. Sunlight photolysis rates were much greater than predicted if photolysis had been limited to the soil surface, with up to 70% lost in a 3 cm deep loamy sand soil after 14 days of irradiation as compared to dark controls. Rates of loss were slower in a sandy clay loam, with 29% loss over 14 days. Rates of transport were affected by sorption, with measured values of the distribution coefficient K d of 0.4-0.72 and 6.6-7.2 mL/g in loamy sand and sandy clay loam soils, respectively.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e3b96edd981436d72b23c5eddbb8b183 https://doi.org/10.1021/es9503950 Zobrazit plný text záznamu