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Bioaccessibility of Environmentally Aged 14C-Atrazine Residues in an Agriculturally Used Soil and Its Particle-Size Aggregates.
- Source :
-
Environmental Science & Technology . 8/15/2008, Vol. 42 Issue 16, p5904-5910. 7p. - Publication Year :
- 2008
-
Abstract
- After 22 years of aging under natural conditions in an outdoor lysimeter the bioaccessibility of 14C-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 <2μm 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 14C-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 claysized aggregates up to 6.2% of the total residual 14C-activity within 23 days. With decreasing soil aggregate sizes, residual `4C- 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 showthat long- term aged 14C-atrazine residues are still partly accessible to the atrazine degrading microorganism Pseudomonas sp. strain ADP. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ATRAZINE
*SOILS
*PARTICLES
*BACTERIA
*SAND
*RADIOACTIVITY
*CLAY
*SOIL structure
Subjects
Details
- Language :
- English
- ISSN :
- 0013936X
- Volume :
- 42
- Issue :
- 16
- Database :
- Academic Search Index
- Journal :
- Environmental Science & Technology
- Publication Type :
- Academic Journal
- Accession number :
- 34120550
- Full Text :
- https://doi.org/10.1021/es800196z