Persistence of aldicarb residues in the sandstone aquifer of Prince Edward Island, Canada / by R.E. Jackson, J.P. Mutch and M.W. Priddle.: En13-5/89-145E-PDF

"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.

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