A weight-of-evidence approach to assess chemicals: case study on the assessment of persistence of 4,6-substituted phenolic benzotriazoles in the environment

Environmental Sciences Europe

Table 8 Summary of dissipation half-lives of M1 for water and sediment under different test conditions (DT₅₀ values for 20 °C)

Water/sediment study (OECD 308) for metabolite M1 of P	Water DT₅₀ ^a (days)	Sediment DT₅₀ ^a (days)
Aerobic conditions
River system (low org. C)	3	32
Pond system (high org. C)	4	248
Anaerobic conditions
Pond system (high org. C)	12	238

^aThe KinGUI-software does not compute the significance of the individual DT₅₀-values. Given the few data points and their trend it is rather low, but for the sediment of the pond systems well above the relevant trigger value of 180 days