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- Title
Sorption of s-triazine herbicides in organic matter amended soils: fresh and incubated systems
- Authors
Graber, E. R.; Sluszny, C.; Gerstl, Z.
- Abstract
Fresh amendment of soil with sewage sludge and composted sewage sludge resulted in increased sorption of three s-triazine herbicides: atrazine, ametryn and terbuthylazine. The extent of increased sorption (as evaluated by sorption coefficients Kd or Kf)was a function of soil type, such that sorption in amended organic carbon-poor soil (0.4% OC) was more enhanced than in amended organic carbon-rich soil (1.55% OC). Despite significant differences between the organic amendments in terms of humic and fulvic acid content, humin content, soluble organic matter content, total organic matter content, and H/C and O/C atomic ratios, organic matter composition had no discernible effect on either sorption distribution coefficients or onisotherm linearity in amended soils. Soils amended with composted sludge had the same sorption potential as did soils amended with the analogous uncomposted sludge. After incubating soil-sludge mixtures fora year at room temperature, organic matter content decreased to original pre-amendment levels. Sorption coefficients for the three compounds similarly decreased to initial pre-amendment values. Organic carbon normalized sorption coefficients (Koc) were essentiallyidentical in the soils, amended soils, and incubated amended soils, indicating that sludge and compost derived organic matter does not have a significantly different sorption capacity as compared with the original soils, despite compositional differences.
- Subjects
HERBICIDES; SOIL chemistry; SLUDGE management
- Publication
Water, Air & Soil Pollution, 1999, Vol 115, Issue 1-4, p395
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1023/a:1005105020757