Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 202-870-9 | CAS number: 100-61-8
Adsorption / desorption
Administrative data
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study
Data source
Reference
- Reference Type:
- publication
- Title:
- Sorption of Nonpolar and Polar Compounds to Soils: Processes, Measurements and Experience with the Applicability of the Modified OECD-Guideline 106
- Author:
- Von Oepen B., Koerdel W. and Klein W.
- Year:
- 1 991
- Bibliographic source:
- Chemosphere, Vol. 22, Nos 3-4, pp. 285- 3()4. 1991
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
- Version / remarks:
- Older version
- Principles of method if other than guideline:
- Use of two soils and one sediment instead of five type of soils recommended in the present guideline.
- GLP compliance:
- no
- Type of method:
- other: Soil-Column Chromatography & Batch Equilibrium Studies
- Media:
- other: Two soils and one sediment
Test material
- Reference substance name:
- N-methylaniline
- EC Number:
- 202-870-9
- EC Name:
- N-methylaniline
- Cas Number:
- 100-61-8
- Molecular formula:
- C7H9N
- IUPAC Name:
- N-methylaniline
Constituent 1
- Radiolabelling:
- no
Study design
- Test temperature:
- Not specified, but all samples were tested under the same conditions.
Batch equilibrium or other method
- Analytical monitoring:
- yes
- Details on sampling:
- The soil samples were shaken for 0.5, 1, 1.5, 5, 24 respectively 72 hours. Then an aliquot of 1 ml of the water-phase was removed to determine the
concentration of the substance in the aqueous phase.
- Details on matrix:
- Soil Corg (%) pH [CaCl2] CEC mval CaCO3 (%) Sand (%) Silt (%) Clay (%)
100 g
Podzol 4.85 2.8 15.1 - 89.2 8.2 2.6
Alfisol 1.25 6.7 12.3 0.4 69.7 14.4 15.9
Sediment 1.58 7.1 13.4 38.9 5.5 58.8 35.7 - Details on test conditions:
- The sorption coefficients were determined according to the test sequence of the modified version of the OECD-Guidcline 106. The steps of the test-scquence were completely performed without considering the criteria for stopping the test-sequence.
Sorption coefficients independent of the concentration are obtained by fitting the Freundlich equation (Kf):
x/m
Kf = _______
C.e^1/n
kt = Freundlich adsorption constant
1/n = compound dependent constant
Results and discussion
Adsorption coefficientopen allclose all
- Type:
- Koc
- Value:
- 460
- % Org. carbon:
- 4.85
- Remarks on result:
- other: Soil type: Podzol; no data on test temperature.
- Type:
- other: Kf
- Value:
- 22.29
- % Org. carbon:
- 4.85
- Remarks on result:
- other: Soil type: Podzol; no data on test temperature.
- Type:
- Koc
- Value:
- 47
- % Org. carbon:
- 1.25
- Remarks on result:
- other: Soil type: Alfisol; no data on test temperature
- Type:
- other: Kf
- Value:
- 0.59
- % Org. carbon:
- 1.25
- Remarks on result:
- other: Soil type: Alfisol; no data on test temperature
- Type:
- Koc
- Value:
- 71
- % Org. carbon:
- 1.58
- Remarks on result:
- other: Soil type: Sediment; no data on test temperature
- Type:
- other: Kf
- Value:
- 1.12
- % Org. carbon:
- 1.58
- Remarks on result:
- other: Soil type: Sediment; no data on test temperature
Any other information on results incl. tables
Results show that the variation in Kf-values for the different sorbents is up to two orders of magnitude for acids, one order of magnitude for esters and amides and up to a factor of 20 for the amines. All correlation coefficients obtained were highly significant (about 1). The slopes of the regression equations varied between 0.6 and 1.2.
Comparison of the sorption coefficients of the test substance with those of aniline and N,N-Dimethylaniline:
Soil | Kf | Koc | r | 1/n |
Test substance: | ||||
Podzol | 22.29 | 460 | 1.00 | 0.89 |
Alfisol | 0.59 | 47 | 1.00 | 0.78 |
Sediment | 1.12 | 71 | 0.99 | 0.77 |
aniline: | ||||
Podzol | 6.34 | 131 | 1.00 | 0.76 |
Alfisol | 1.39 | 111 | 1.00 | 0.72 |
Sediment | 1.78 | 113 | 1.00 | 0.65 |
N,N-dimethylaniline: | ||||
Podzol | 16.33 | 337 | 1.00 | 0.96 |
Alfisol | 1.21 | 97 | 0.99 | 0.60 |
Sediment | 1.84 | 116 | 1.00 | 0.91 |
Applicant's summary and conclusion
- Validity criteria fulfilled:
- not applicable
- Conclusions:
- Aromatic amines mainly sorb to the organic matter of the soil. The sorption of amino-groups to clay-minerals or pH-dependent sorption of acids plays a key role. A normalization to the organic matter of the soil does not significantly reduce the variation in polar substances' sorption coefficients. For polar compounds like the amines, the calculation of a koc-value is of no use. The variation of the sorption behaviour of a polar substance between two soils impedes the applicability to other soils.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
