DISTRIBUTION AND NATURE OF BOUND (NONEXTRACTABLE) RESIDUES OF ATRAZINE IN A MINERAL SOIL 9 YEARS AFTER THE HERBICIDE APPLICATION

Uniformly 14C ring-labeled atrazine was applied to a mineral soil under field conditions. Nine years after application of the herbicide soil samples were collected for analysis. The soil contained about 50% 14C residues in the bound (nonextractable) form. The bound 14C residues were distributed among the various soil humic fractions. In addition to the parent herbicide a considerable proportion of these residues was comprised of the hydroxy analogs of atriazine and their dealkylated products.