Bioaccessibility of environmentally Aged 14C-Atrazine Residues in an Agriculturally Used Soil and its Particle-Size Aggregates

Jablonowski, N. D.; Schäffer, A.; Burauel, P.; Modler, J.

doi:10.1021/es800196z

Journal Article

Bioaccessibility of environmentally Aged 14C-Atrazine Residues in an Agriculturally Used Soil and its Particle-Size Aggregates

Jablonowski, N. D.FZJ* ; Modler, J. ; Schäffer, A. ; Burauel, P.FZJ*

2008
American Chemical Society Columbus, Ohio

Environmental Science & Technology 42(16), 5904 - 5910 (2008) [10.1021/es800196z]

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Please use a persistent id in citations: http://hdl.handle.net/2128/4609 doi:10.1021/es800196z

Abstract: After 22 years of aging under natural conditions in an outdoor lysimeter the bioaccessibility of C-14-labeled atrazine soil residues to bacteria was tested. Entire soil samples as well as sand-sized, silt-sized, and clay-sized aggregates (> 20, 20-2, and < 2 mu m aggregate size, respectively) were investigated under slurried conditions. The mineralization of residual radioactivity in the outdoor lysimeter soil reached up to 4.5% of the total C-14-activity after 16 days, inoculated with Pseudomonas sp. strain ADP. The control samples without inoculated bacteria showed a mineralization maximum of only about 1% after 44 days of incubation. Mineralization increased in the clay-sized aggregates up to 6.2% of the total residual 14C-activity within 23 days. With decreasing soil aggregate sizes, residual C-14-activity increased per unit of weight, but only minor differences of the mineralization in the soil and soil size aggregates using mineral-media for incubation was observed. Using additional Na-citrate in the incubation,the extent of mineralization increased to 6.7% in soil after 23 days following incubation with Pseudomonas sp. strain ADP. These results show that long-term aged IT-atrazine residues are still partly accessible to the atrazine degrading microorganism Pseudomonas sp. strain ADP.

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