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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption to the solid soil phase is expected.

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. 

Assessment:

The substance is an UVCB substance. In accordance with Annex IX, Section 9.3.2 and Section 9.2.1.2 the assessment of bioaccumulation or bioconcentration and biodegradation of each constituent and impurity present in concentrations at or above 0.1% (w/w) must be performed. Since the substance is a complex mixture of isomers and homologues components no purity (% w/w) can be stated. Therefore, the corrected area-% values of constituents were determined by gas chromatography with FID. The evaluated area-% values were corrected with the content of water.

The following five main constituents which concentrations at or above 10 area % along with two constituents with the highest and the lowest molecular weight were analytically determined:

1.    Constituent 1 (CCC(COC(=O)C=C)(COC(=O)C=C)COC(=O)C=C)

2.    Constituent 2 (CCC(COC(C)COC(=O)C=C)(COC(C)COC(=O)C=C)COC(=O)C=C)

3.    Constituent 3 (CCC(COCCOC(=O)C=C)(COC(C)COC(=O)C=C)COC(=O)C=C)

4.    Constituent 4 (CCC(COC(C)COC(=O)C=C)(COC(C)COC(=O)C=C)COC(C)COC(=O)C=C)

5.    Constituent 5 (CCC(COCCOC(=O)C=C)(COC(C)COC(=O)C=C)COC(C)COC(=O)C=C)

6.    Constituent 6 (CCC(COCCOC(=O)C=C)(COCCOC(=O)C=C)COC(C)COC(=O)C=C)

7.    Constituent 7 (CCC(COCCOCCOC(=O)C=C)(COC(C)COC(C)COC(C)COC(=O)C=C)COC(=O)C=C)

Constituent 2 and 3 were determined to have a concentration of 22.4 area %. Constituent 3, 4 and 5 were determined to have a concentration value of 19.9 area %. The constituent 1 has the lowest molecular weight of 296 g/mol and the concentration of 0.6 area %. The highest molecular weight was determined for the constituent 7 (547 g/mol) which concentration was at 2.9 area %.

Therefore, the assessment of the seven constituents of Laromer PO 33F (EC 601-566-7) was performed.

Further experimental studies on adsorption to soil are not provided. Therefore, the Koc values were calculated for the substance with KOCWIN v2.00, implemented in EPISuite v4.11 (BASF, 2019).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.

The following table provides results for the mentioned above constituents of the substance: constituent 1, constituent 2, constituent 3, constituent 4, constituent 5, constituent 6 and constituent 7

 

MCI Method

Koc [L/kg] / Log Koc

Log Kow Method

Koc / Log Koc

AD

Constituent 1

1511 / 3.2

238 / 2.4

Yes

Constituent 2

2574 / 3.4

226 / 2.4

Yes

Constituent 3

1605 / 3.2

133 / 2.1

Yes

Constituent 4

3360 / 3.5

220 / 2.3

No

Constituent 5

2094 / 3.3

129 / 2:1

No

Constituent 6

1305 / 3.1

76.3 / 1.9

No

Constituent 7

1166 / 3.07

46 / 1.7

No

As can be seen from the data compiled above,the predicted log Koc value for all of the constituents of the registration item are slightly above 3 and thus indicate the potential for adsorption. The constituent 1, 2 and 3 are within the applicability domein of the model.

Since Laromer PO 33F is uncharged at physiologically relevant pH values, the estimates are representative for the uncharged molecules of the major components.

Hence, based on the available calculated data the adsorption to the solid soil phase is expected.

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