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Environmental fate & pathways

Phototransformation in air

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Description of key information

After evaporation or exposure to air, AMIX TE (CAS 68953 -70 -8) 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 AMIX TE and its constituents (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:

No experimental data on the phototransformation in air are available for AMIX TE or its three major constituents. Therefore, the assessment is based on estimated data for the major constituents 2,2’,2’’-nitriloethanol (CAS 102-71-6), 2,2’-[[2-(2-Hydroxyethoxy)ethyl]imino]bisethanol (CAS 17626-34-5) and N.N.N'.N'-Tetra-(2-hydroxyethyl)-bis 2.2'-aminoethylether (CAS 55468-09-2). The photodegradation potential was calculated with AOPWIN v1.92 (EPISuite v4.11; BASF SE, 2016/2017). All three substances were within the applicability domain of the model; however, as the substances are tertiary amines, the estimates may be highly uncertain. The results are summarized in the table below:

CAS no.

Typical conc.

Transformation rate constant

[cm³/molecule/s]

Half-life

[h]

102-71-6

86%

1.105E-10

3.5

17626-34-5

6%

1.443E-10

2.7

55648-09-2

7%

2.662E-10

1.5

The calculated half-lives indicate that the substances will be rapidly degraded by photochemical processes (T1/2 < 24 h). It can be concluded that AMIX TE will be rapidly degraded by photochemical processes after evaporation or exposure to the air.