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| Titel: |
Sorption of imidacloprid and its metabolites on tropical soils |
| Auteur: |
Oliveira, R. S. Koskinen, W. C. Werdin, N. R. Yen, P. Y. |
| Verschenen in: |
Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes |
| Paginering: | Jaargang 35 (2000) nr. 1 pagina's 39-49 |
| Jaar: |
2000-01 |
| Inhoud: |
The sorption of imidacloprid (l-[(6-chloro-3-pyridinyl)-methyl]-N-nitro-2-imidazolid-inimine) (IMI) and its metabolites imidacloprid-urea (l-[(6-chloro-3-pyridinyl)-methyl]-2-imidazol-idinone) (IU), imidacloprid-guanidine (l-[(6-chloro-3-pyridinyl)-methyl]-4,5-dihydro-lH-imidazol-2-amine) (IG), and imida-cloprid-guanidine-olefin ( 1 -[(6-chloro-3-pyridinyl)methyl]-lH-imidazol-2-amine) (IGO) was determined on six typical Brazilian soils. Sorption of the chemicals on the soil was characterized using the batch equilibration method. The range and order of sorption (Kd) on the six soils was IG (4.75-134) > IGO (2.87-72.3) > IMI (0.55 -16.9) > IU (0.31-9.50). For IMI and IU, Kd was correlated with soil organic carbon (OC) content and CEC, the latter due to the high correlation between OC and cation exchange capacity (CEC) (R2=0.98). For IG and IGO, there was no correlation of sorption to clay, pH, OC or CEC due to the high sorption on all soils. Average Koc values were IU = 170, IMI = 362, IGO = 2433, and IG = 3500. Although Kd and Koc values found were consistently lower than those found in soils developed in non-tropical climates, imidacloprid and its metabolites were still considered to be slightly mobile to immobile in Brazilian soils. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 9 van 9 gevonden artikelen
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