Registration Dossier

Environmental fate & pathways

Phototransformation in air

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

DT50 (24 h-day): 10.3 h (AOPWIN v1.91, M-243077-01-1)

Key value for chemical safety assessment

Half-life in air:
10.3 h

Additional information

Since no experimental study is available investigating the phototransformation of the test item in air (Q)SAR modelling was applied (M-243077-01-1). AOPWIN estimates the rate constant for the atmospheric, gas-phase reaction between photochemically produced hydroxyl radicals and organic chemicals. The rate constants estimated by the program are used to calculate atmospheric half-lives for organic compounds based upon average atmospheric concentrations of hydroxyl radicals and ozone. The photochemical half-life of the test item in air was estimated by use of the AOPWIN, version 1.91. When the OH concentration is assumed to be 1.5E+06 radicals/cm³ (12 h day), for the reaction with evaporated compound in air, a half-life of 3.4 h (0.3 d) was calculated. The corresponding chemical lifetime is 4.9 h (0.4 d). When the OH concentration is assumed to be 0.5E+5 radicals/cm³ (24 h day), the half-life is 10.3 h (0.4 d) and the corresponding chemical lifetime is 14.8 h (0.6 d).