Registration Dossier
Registration Dossier
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EC number: 202-809-6 | CAS number: 100-00-5
Adsorption / desorption
Administrative data
- Endpoint:
- adsorption / desorption
- Remarks:
- adsorption/desorption
- Type of information:
- experimental study
- Adequacy of study:
- other information
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: acceptable, well documented publication which meets basic scientific principles
Data source
Reference
- Reference Type:
- publication
- Title:
- Adsorption of Substituted Nitrobenzenes and Nitrophenols to Mineral Surfaces.
- Author:
- Haderleln S.B. and Schwarzenbach R.P.
- Year:
- 1 993
- Bibliographic source:
- Environ. Sci. Technol., Vol. 27, No. 2, pp. 316-326
Materials and methods
- Principles of method if other than guideline:
- The adsorption of a large number of nitroaromatic compounds (NACs) (e.g. 4-chloronitrobenzene) to mineral surfaces, particularly to homoionic kaolinites, has been investigated.
- GLP compliance:
- no
- Type of method:
- HPLC estimation method
- Media:
- other: mineral surfaces, particulary to homoionic kaolinites
Test material
- Reference substance name:
- 1-chloro-4-nitrobenzene
- EC Number:
- 202-809-6
- EC Name:
- 1-chloro-4-nitrobenzene
- Cas Number:
- 100-00-5
- Molecular formula:
- C6H4ClNO2
- IUPAC Name:
- 1-chloro-4-nitrobenzene
Constituent 1
Results and discussion
Results: Batch equilibrium or other method
- Adsorption and desorption constants:
- Kd = 44 L/kg
Any other information on results incl. tables
An apparent sorption equilibrium was always attained within a few minutes. After this time no detectable concentration changes occurred; thus typical equilibration times between 30 - 60 minutes were used in all experiments. Desorption kinetics of NACs were also investigated, and it was also found that desorption equilibrium was reached within a few minutes. The results demonstrate that nitroaromatic compounds may adsorb specifically and reversible to the negatively charged siloxane surface of kaolinite. At high surface coverage the adsorption isotherms generally exhibit a saturation-type curvature approaching a maximum surface concentration of ca. 2.5 mmol of NAC/kg of kaolinite. At low surface coverage the isothermes were linear and a constant distribution coefficient Kd (L/kg), can be defined for this part of the isotherm. The Kd calculated for p-chloronitrobenzene is 44 L/kg.
Applicant's summary and conclusion
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