Abstract
The degradation of 14C-naproanilide [1-(2-naphthoxy) propionanilide] labelled at the naphthalene-ring in three different soils under oxidative (aerobic) and reductive (anaerobic) flooded conditions was studied in the laboratory. 14C-Naproanilide was rapidly degraded under both conditions, and the difference in rates among the different soils was small. The degradation products in the organic solvent extracts detected by thin layer chromatography were composed of 1-(2-naphthoxy) propionic acid, the major product, and methyl 1-(2-naphthoxy) propionate, 2-naphthol, 2-hydroxy-1, 4-naphthoquinone and 2, 3-, 2, 6- and 2, 7-dihydroxynaphthalenes, minor products. A larger amount of 14CO2 was liberated under oxidative than reductive conditions. Soil-bound residues of the radioactive materials in the two mineral soils increased to a larger extent under oxidative than reductive conditions, but the increase under both conditions was small in volcanic ash soil.
