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Sorption and photolysis studies in soil and sediment of the herbicide napropamide |
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| Authors: | JP Aguer L Cox C Richard MC Hermosin J Cornejo |
| Institution: | 1. Laboratoire de Photochimie , UMR 6505, Aubière Cedex, F‐63177, France;2. Instituto de Recursos Naturales y Agrobiologia de Sevilla , CSIC , Apartado 1052, Sevilla, 41080, Spain;3. Instituto de Recursos Naturales y Agrobiologia de Sevilla , CSIC , Apartado 1052, Sevilla, 41080, Spain E-mail: mchermosín@irnase.csic.esa |
| Abstract: | Abstract The influence of soil and sediment composition on sorption and photodegradation of the herbicide napropamide N, N‐diethyl‐2‐(1‐naphthyloxy)propionamide] was investigated. Five soils and one sediment were selected for this study and the clay fractions were obtained by sedimentation. Sorption‐desorption was studied by batch equilibration technique and photolysis in a photoreactor emitting within 300–450 nm wavelenght with a maximum at 365 nm. Sorption increased with clay content and was not related to organic matter *content. High irreversibility of sorption was related to the greater montmorillonite content. The presence of soil or sediment reduced photolysis rate due to screen effect and this process did not depend on solid composition but on particle size distribution. |
| Keywords: | Napropamide sorption desorption soils sediment clay photolysis |