Formaldehyde, oligomeric reaction products with diethylenetriamine and phenol

Adsorption / desorption

Link to relevant study record(s)

Reference

Endpoint:

adsorption / desorption: screening

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))

Deviations:

no

GLP compliance:

yes

Type of method:

HPLC estimation method

Media:

soil

Radiolabelling:

no

Remarks on result:

not determinable because of methodological limitations

Remarks:

An assessment of the test item indicated that it would be at least partially ionized across the environmentally relevant pH range (pH 5 to 7). Therefore, it is anticipated that adsorption to the organic carbon content of soils and sediments would not be the dominant mechanism controlling the mobility of the test item in the environment. Adsorption of cationic species occurs primarily by an ion-exchange mechanism and depends on the cation-exchange capacity of the soils as well as a variety of other parameters (Boethling, R. S. 1994. Environmental aspects of cationic surfactants. In J. Cross and E. J. and Singer (ed.), Cationic Surfactants: Analytical and Biological Evaluation, vol. 53. Marcel Dekker, Inc., New York, USA.). Consequently, the true adsorption coefficient of the test item would be significantly higher than a Koc value determined by the methods C.19 and OECD 121 or via any computer-based Koc estimation software.

Validity criteria fulfilled:

not applicable

Executive summary:

Testing was not carried out using Method C.19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for Testing of Chemicals, 22 January 2001, as they were considered not applicable due to the following reason:

• An assessment of the test item indicated that it would be at least partially ionized across the environmentally relevant pH range (pH 5 to 7).  Therefore, it is anticipated that adsorption to the organic carbon content of soils and sediments would not be the

dominant mechanism controlling the mobility of the test item in the environment.  Adsorption of cationic species occurs primarily by an ion-exchange mechanism and depends on the cation-exchange capacity of the soils as well as a variety of other parameters (Boethling, R. S. 1994. Environmental aspects of cationic surfactants. In J. Cross and E. J. and Singer (ed.), Cationic Surfactants: Analytical and Biological Evaluation, vol. 53. Marcel Dekker, Inc., New York, USA.).  Consequently, the true adsorption coefficient of the test item would be significantly higher than a Koc value determined by the methods C.19 and OECD 121 or via any computer-based Koc estimation software.

Therefore, based on the expected high cation-exchange ability of the test item, the test item is anticipated to lack mobility in soils.

Description of key information

Testing was not carried out using Method C.19 Adsorption Coefficient of Commission

Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for

Testing of Chemicals, 22 January 2001, as they were considered not applicable due to the

following reason:

• An assessment of the test item indicated that it would be at least partially ionized

across the environmentally relevant pH range (pH 5 to 7).  Therefore, it is anticipated

that adsorption to the organic carbon content of soils and sediments would not be the

dominant mechanism controlling the mobility of the test item in the environment.  

Adsorption of cationic species occurs primarily by an ion-exchange mechanism and

depends on the cation-exchange capacity of the soils as well as a variety of other

parameters (Boethling, R. S. 1994. Environmental aspects of cationic surfactants. In

J. Cross and E. J. and Singer (ed.), Cationic Surfactants: Analytical and Biological

Evaluation, vol. 53. Marcel Dekker, Inc., New York, USA.).  Consequently, the true

adsorption coefficient of the test item would be significantly higher than a Koc value

determined by the methods C.19 and OECD 121 or via any computer-based Koc

estimation software.

Therefore, based on the expected high cation-exchange ability of the test item, the test item is

anticipated to lack mobility in soils.