Volatilization and mineralization of C-14-labelled pesticides on lysimetersurfaces

The volatilization and mineralization of C-14-labelled chemicals applied on soil surfaces in lysimeters was determined continuously with a new develop ed test-system. C-14-Terbuthylazine and C-14-Pendimethalin were applied on two different types of soil, one typical for a sandy agricultural soil and the second one simulating a soil of an adjoining forest ecosystem. Volatili zation of terbuthylazine within 32 - 36 days was 0.26 - 0.65 % of the amoun t initially applied, that of pendimethalin 1.24 - 2.78 within 28 days. Mine ralization was 1.02 - 7.41 % for terbuthylazine and 2.79 - 5.39 % for pendi methalin within 28 - 36 days. (C) 1999 Elsevier Science Ltd. All rights res erved.