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Environmental fate & pathways

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Thymol is readily biodegradable with 83% biodegradation observed in 28 days at 0.8 mg/l test concentration. Meanwhile, it is inherently biodegradable with 94% biodegradation observed in 5 days. No further simulation tests and hydrolysis study are considered necessary, since thymol is readily biodegradable. However, thymol is expected to be hydrolytically stable in water with regard to its chemical structure.

Thymol is not bioaccumulative in aquatic organisms with measured BCF of 48 at 1 µg/l and 7.8 -19 at 10 µg/l. Simultaneously, thymol has a moderate adsorption potential in solid/sludge with an estimated log Koc of 2.9 -3.3.

Thymol is non-volatile with a calculated Henry'law constant of 0.12 Pa*m³/mol. The estimated half-life in air of thymol is 3.6 h, which is much shorter than 48 hours; and hence no potential for long-range transport of thymol in air is expected.

The distribution calculation (Mackay level I) showed that the main target compartment for tyhmol is water of 67.8 %, soil of 10.7 % and sediment of 10.8%, followed by air of 10.6 %.

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