Registration Dossier
Registration Dossier
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EC number: 204-524-2 | CAS number: 122-14-5
Endpoint summary
Administrative data
Description of key information
The following studies are available for fenitrothion:
Relevant studies and endpoints |
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Adsorption/desorption |
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Relevant study |
Endpoints |
5.4.1 Key Study, PTRL West Inc, 2002 (HM-0198)Soil Adsorption/Desorption of[14C] Fenitrothion by the Batch EquilibriumMethod (OECD 106). |
The Freundlich adsorption coefficients (K values) Light clay (Kochi): 24 Loam (Hokkaido): 20 Light clay (Wakayama): 30 Sand (Miyazaki): 9
Adsorption Koc values Light clay (Kochi): 1935 Loam (Hokkaido): 816 Light clay (Wakayama): 1659 Sand (Miyazaki): 938
Desorption Koc values Light clay (Kochi): 2177 Loam (Hokkaido): 1061 Light clay (Wakayama): 2074 Sand (Miyazaki): 1042
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5.4.1 Supporting Study, Stauffer Chemical Company/ Western Research Center, 1979 (HW-91-0188),Adsorptionand/DesorptionofSumithioninVarious Soils(Method: according to Federal Register, 40 (123), 26881 (1975))
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The Freundlich adsorption coefficients (Kf values) (26°C) Silty Clay loam: 13 Silty clay: 18 Sand: 4.9 Sandy loam: 32 pond: 830
Adsorption Koc values (26°C) Silty Clay loam: 350 Silty clay: 252 Sand: 384 Sandy loam: 1022 pond: 1966
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Additional information
HM-0198
Results of HPLC analyses of adsorption and desorption solutions in addition to soil samples extracted after completion of the desorption phase, indicated that fenitrothion was partially degraded to 3-methyl-4-nitrophenol (NMC) under the study conditions. The Koc values for desorption were higher than during the adsorption phase, indicating that once adsorbed to the soil fenitrothion is less likely to be removed with water or to leach in these soils (Koc values ranged from 1042 to 2177).
HW-91-0188
On the basis of these findings, fenitrothion is classified as having medium to low mobility according to the McCall classification. There was no pH dependency on the soil adsorption and desorption for fenitrothion.
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