Registration Dossier
Registration Dossier
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EC number: 202-951-9 | CAS number: 101-54-2
Endpoint summary
Administrative data
Description of key information
Additional information
At 25°C the hydrolysis half-lives of 4-ADPA of 42 days at pH 7.0 and 75 days at pH 4 with light excluded were observed. In nutrient medium same as the one used in algal inhibition test, the half-life of 4-ADPA decreased to 3.5 d in presence of light and oxygen. 4-hydroxydiphenylamine and aniline were observed as main metabolites. The obtained half-life of 3.5 d was used to estimate the effective concentrations from nominal concentrations in ecotoxicity studies.
The UV spectrum of 4-ADPA indicates that photodegradation under environmental conditions is possible. 4-ADPA can be completely photocatalytically oxidized in water using TiO2 and/or SnO2 in 3.5 hours (Hilmi A, 1998). The indirect atmospheric oxidation rate by reaction with OH-radicals was estimated by using AOPWIN v1.90 to be 2*10-10 cm³ molecule-1 s-1and half-life thus 1.92 h. The estimated half-life in air of 4-ADPA is much shorter than 48 hours and hence no potential for long-range transport of 4-ADPA in air is expected.
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