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Environmental fate & pathways

Biodegradation in soil

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Description of key information

Half-lives between 16 and 377 days have been determined for main constituents of AOH. A value in the upper part of this range is considered to represent best the overall biodegradation of AOH in soil.

Key value for chemical safety assessment

Half-life in soil:
260 d

Additional information

Biodegradation in soil of the substance distillates (coal tar), heavy oils (anthracene oil >50 ppm BaP, AOH), will best be characterised by half-lives determined for individual constituents of the substance. Main components are 3-ring and 4-ring PAH (phenanthrene, anthracene, fluoranthene and pyrene, see Chapter 1.2). For these substances, half-lives have been determined to be between 16 and 377 days (see table above). Results for three ring PAH indicate half-lives predominantly below 120 days while half-lives of 4-ring PAH have been determined to be above 180 days.

Half-lives for 4-ring PAH reported in the Park study imply some uncertainty as duration of the test was only 196 and 105 days for soil #1 and #2 respectively.