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EC number: 620-056-5 | CAS number: 874195-61-6
Phototransformation in soil
Administrative data
Link to relevant study record(s)
Description of key information
DT50 = 0.4-2.5 days (OECD draft guideline)
Degradation of triafamone in soil is mainly caused by microbial activity. Photodegradation of triafamone on soil surfaces is not regarded as a significant degradation process.
Key value for chemical safety assessment
Additional information
The photolytic route and rate of degradation of triafamone (CAS No. 874195-61-6) was studied on soil under exposure to simulated sunlight and aerobic conditions in the laboratory for 8 days at 20 °C and 55% of the maximum water holding capacity in comparison to samples incubated in the dark. A study application rate of 5.1 - 5.2 μg per test system (1.7 mg per kg soil dry weight) was applied. In a supplementary test, the photodegradation of triafamone was studied additionally on dry soil. The experimental data were described by a single first order (SFO) kinetic model. The half-life (DT50) for triafamone was 1.1-2.5 and 0.4-0.5 days in the irradiated and dark samples, respectively. Based on the experimental DT50 value of 1.1-2.5 days for irradiated samples, the environmental DT50 value is calculated to be e.g. 4.1-13.7 solar summer days at Phoenix, Arizona, USA, or 8-26.6 solar summer days at Tokyo, Japan. The results show that photodegradation of triafamone on soil surfaces is not regarded as a significant degradation process in the overall degradation of triafamone in the environment. Additionally, the results show that the rapid degradation of triafamone in soil is mainly caused by microbial activity and also that soil moisture content has a significant influence on the degradation.
Reference:
Heinemann, O., Unold, M., 2012: [Triazine-UL-14C]AE 1887196: Phototransformation on Soil. unpublished data, Testing laboratory: Bayer CropScience AG Research&Development Environmental Safety Metabolism/ADME and Environmental Fate. Report no.: MEF-10/636. Owner company: Bayer CropScience AG. Study number: M-426859-02-1. Report date: 2012-03 -18
Heinemann, O., Unold, M., 2012: [Phenyl-UL-14C]AE 1887196: Phototransformation on Soil. unpublished data, Testing laboratory: Bayer CropScience AG Research&Development Environmental Safety Metabolism/ADME and Environmental Fate. Report no.: MEF-10/604. Owner company: Bayer CropScience AG. Study number: M-427573 -01-1. Report date: 2012-03-08
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