| pesticide by-products in the rhône delta (southern france). the case of 4-chloro-2-methylphenol and of its nitroderivative. | a field monitoring campaign for pesticides and their transformation intermediates was carried out in the rhône delta (southern france). it was evidenced the following transformation sequence: mcpa-->4-chloro-2-methylphenol (cmp)-->4-chloro-2-methyl-6-nitrophenol (cmnp). interestingly cmp disappeared about as quickly as mcpa, while cmnp was environmentally more persistent than the parent molecules. this is very relevant to the environmental risk associated with the occurrence of these compounds, ... | 2009 | 18996569 |
| runoff of pesticides from rice fields in the ile de camargue (rhône river delta, france): field study and modeling. | a field study on the runoff of pesticides was conducted during the cultivation period in 2004 on a hydraulically isolated rice farm of 120 ha surface with one central water outlet. four pesticides were studied: alphamethrin, mcpa, oxadiazon, and pretilachlor. alphamethrin concentrations in runoff never exceeded 0.001 microg l(-1). the three other pesticides were found in concentrations between 5.2 and 28.2 microg l(-1) in the runoff water shortly after the application and decreased thereafter. t ... | 2008 | 17562351 |
| occurrence of 2,4-dichlorophenol and of 2,4-dichloro-6-nitrophenol in the rhone river delta (southern france). | the compounds 2,4-dichlorophenol (2,4-dcp) and 2,4-dichloro-6-nitrophenol (6-nitro-2,4-dcp) have been detected at microg l(-1) levels (10(-9)-10(-8) m) during the summer season 2005 in the water of the rhône river delta. compound 2,4-dcp would mainly derive from the transformation of the herbicide dichlorprop, heavily used in flooded rice farming (1400 kg in the delta region in 2005), in addition to being an impurity of the commercial herbicide. field data show a fast concentration decrease of 2 ... | 2007 | 17539515 |