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Environmental fate & pathways

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Though the test substance is hydrolytically stable, it is rapidly removed from surface waters via adsorption to underlying sediment. In an aerobic mineralisation study the test substance did not mineralise and was stable in surface water during the 60-day study.  In a laboratory water/sediment study, the half-life (DT50) of the test substance in the water phase was 7.3–17.4 days. Once in the sediment the test substance is degraded with an overall whole system DT50 of 47-56.7 days. The rate of aerobic degradation of the test substance in the laboratory was measured in four different soils. Under laboratory conditions, the test substance degraded quickly with DT50 values ranged from 19.1 to 31.8 days at 20°C. No correlation was observed between the rate of degradation of the test substance and soil pH.

 

The test substance is not classified as readily biodegradable. After 29 days of incubation with activated sludge, the test substance degradation reached a maximum mean of 5.4% ThCO2. The test substance was not inhibitory to the microbial activity of the inoculum. In an anaerobic soil metabolism test, [Pyridine-3-14C] and [Phenyl-14C(U)]test substance degraded slowly under anaerobic conditions.

 

The measured bioconcentration factor (BCF) in whole fish for the test substance was 290 in blue gill, which is less than 500, the value considered as indicative of the potential to bioconcentrate.

 

The vapour pressure and Henry’s law constant of the test substance indicate that it has no potential to volatilize and therefore could not have any global warming potential (GWP), ozone depleting potential (ODP), photochemical ozone creation potential (POCP) or be expected to accumulated in the troposphere. The test substance is not listed in Annex I to Regulation (EC) No 2037/2000 of the European Parliament and of the Council of 29 June 2000 on substances that deplete the ozone layer and its subsequent amendments.

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