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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. 

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 3.17.

Thymol is non-volatile with a calculated Henry's law constant of 0.122 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 thymol is water of 67.8 %, soil of 10.7 % and sediment of 10.8%, followed by air of 10.6 %.

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