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TECHNICAL REPORT
Organic Compounds in the Environment

Degradation of ¹⁴C-Atrazine Bound Residues in Brown Soil and Rendzina Fractions

^a Centre de Pédologie Biologique, CNRS, 17 rue Notre Dame des Pauvres, BP 5, 54501, Vanduvre-lès-Nancy Cedex, France
^b UMR-CNRS 5561 Biogéosciences, 6 bd Gabriel, 21000 Dijon, France

* Corresponding author (munier{at}cpb.cnrs-nancy.fr)

Received for publication December 29, 2000. The remobilization and the fate of ¹⁴C-ring labeled atrazine (6-chloro-N²-ethyl-N⁴-isopropyl-1,3,5-triazine-2,4-diamine) bound residues was examined in relation with the turnover of natural soil organic matter. Soil fractions of a brown soil and a rendzina were incubated under controled laboratory conditions. The mineralization of natural organic matter and atrazine-bound residues was respectively estimated by the amounts of CO₂ and ¹⁴CO₂ evolved during the incubation. The remobilization and distribution of ¹⁴C residues among the soil organic fractions were achieved after physical–chemical extractions of the samples. Comparisons of samples in abiotic and biotic conditions allowed us to assess the influence of microbial activity on the fate of atrazine-bound residues. The mineralization curves showed that natural organic matter and atrazine-bound residues had similar decomposition patterns. After 100 d of incubation, 0.8 to 3.6% of total organic C was evolved as CO₂, while only 0.1% of the initial radioactivity was mineralized as CO₂, and 7 to 15% was becoming extractable with water and methanol. Few differences were observed in the distribution of residues within organic compounds for both fractions of the rendzina, except a decrease of the ¹⁴C radioactivity of the 50- to 5000-µm fraction and a slight increase of that of humin. For the 0- to 5000-µm brown soil fraction, increased radioactivity in humin at the expense of humic (HA) and fulvic (FA) acids was detected after incubation, while for the 0- to 50-µm fraction more radioactivity was recovered with FA.

Abbreviations: FA, fulvic acid • HA, humic acid