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Environmental fate & pathways

Phototransformation in air

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Description of key information

After evaporation or exposure to the air, the reaction mass of 4-methoxyphenol and 4-methoxy-cyclohexanone and 4-methoxy-cyclohexanol (EC 947-389-1; Mochon roh) will be rapidly degraded by photochemical processes.

Key value for chemical safety assessment

Additional information

QSAR-disclaimer:

In Article 13 of Regulation (EC) No 1907/2006, it is laid down that information on intrinsic properties of substances may be generated by means other than tests, provided that the conditions set out in Annex XI (of the same Regulation) are met.

 According to Annex XI of Regulation (EC) No 1907/2006 (Q)SAR results can be used if (1) the scientific validity of the (Q)SAR model has been established, (2) the substance falls within the applicability domain of the (Q)SAR model, (3) the results are adequate for the purpose of classification and labeling and/or risk assessment and (4) adequate and reliable documentation of the applied method is provided.

 For the assessment of reaction mass of 4-methoxyphenol and 4-methoxy-cyclohexanone and 4-methoxy-cyclohexanol (EC 947-389-1; Mochon roh). (Q)SAR results were used for phototransformation in air. The criteria listed in Annex XI of Regulation (EC) No 1907/2006 are considered to be adequately fulfilled and therefore the endpoint(s) sufficiently covered and suitable for risk assessment.

Therefore, further experimental studies on phototransformation in air are not provided.

Assessment

The photodegradation was calculated for 4 -methoxycyclohexanone (CAS 13482-23-0), 4 -methoxycyclohexan-1-ol (CAS 18068-06-9) and mequinol (CAS 150-76-5) which are the representative constituents of the reaction mass of 4-methoxyphenol and 4-methoxy-cyclohexanone and 4-methoxy-cyclohexanol (EC 947-389-1; Mochon roh).

 Substance

OH radical rate constant (cm³/(molecule*sec))

half-life (h)

4-methoxycyclohexanone (CAS 13482-23-0)

2.94E-11

13.1

4-Methoxycyclohexan-1-ol (CAS 18068-06-9)

3.47E-11

11.1

Mequinol (CAS 150-76-5)

2.99E-11

12.9

 

Based on the respective estimated OH radical rate constants between of 2.94E-11 and 3.47E-11 cm³/(molecule*sec), the half-lives of the constituents were calculated to be in the range from 11.1 to 13.1 h using AOPWIN v1.92 of EPI Suite v4.11 (test conditions: sensitizer for indirect photolysis: OH; 0.5 E06 OH/cm³, 24-h day). All substances were within the applicability domain of the model (BASF SE, 2018).

Therefore, it is can be concluded that after evaporation or exposure to the air, Mochon roh (EC 947-389-1) will be rapidly degraded by photochemical processes.