00000nam 2200000zi 4500 9.873805 CaOODSP 20241203113649 m o d f cr ||||||||||| 190529e198906##oncabd #ob f000 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn-pi En13-5/89-145E-PDF Jackson, R. E. (Richard Ervin) author. Persistence of aldicarb residues in the sandstone aquifer of Prince Edward Island, Canada / by R.E. Jackson, J.P. Mutch and M.W. Priddle. Burlington, Ontario : National Water Research Institute, Canada Centre for Inland Waters, June 1989. 1 online resource (15 pages, 10 unnumbered pages) : illustrations, maps, graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; 89-145 "RRB 89-51." Title from cover. Digitized edition from print [produced by Environment and Climate Change Canada]. "This manuscript has been prepared for the Journal of Contaminant Hydrology." Includes bibliographical references. "Aldicarb residues are found in the shallow ground waters of the fractured, sandstone aquifer of Prince Edward Island, Canada, well over two years after the last application of this pesticide. Furthermore, the concentrations of aldicarb measured are relatively constant with time. The chemical and hydrogeological mechanisms by which such persistence occurs are discussed. It is deduced that aldicarb degradation is inhibited by the low pH and temperature of the soil and ground water, the former being partly due to the pH buffering effects of ammonium fertilizer oxidation on the hydrolytic degradation of aldicarb. The aldicarb residues are prevented from migrating from beneath the fields on which they were applied by in-situ storage processes associated with diffusion from the aquifer fractures into the interstitial matrix of the sandstone and reverse diffusion into the fractures, thereby maintaining constant and relatively high concentrations in ground water"--Abstract. Includes abstract and management perspective in English and French. gccst Pesticides gccst Groundwater gccst Water pollution Mutch, James Percy, 1949- author. Priddle, Mark William, 1963- author. Canada. Environment Canada. Canada Centre for Inland Waters. National Water Research Institute (Canada) NWRI contribution ; 89-145. (CaOODSP)9.844121 PDF 1.88 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-89-145-eng.pdf