Registration Dossier
Registration Dossier
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EC number: 202-045-3 | CAS number: 91-16-7
Adsorption / desorption
Administrative data
- Endpoint:
- adsorption / desorption, other
- Remarks:
- adsorption
- Type of information:
- experimental study
- Adequacy of study:
- other information
- Reliability:
- 3 (not reliable)
- Rationale for reliability incl. deficiencies:
- other: A number of information necessary to validate the quality of the experimental information is not available in the paper.
Data source
Reference
- Reference Type:
- publication
- Title:
- Adsorption of pesticides by some Australian soils
- Author:
- Briggs GG.
- Year:
- 1 981
- Bibliographic source:
- Aust J Soil Res. 1981;19:61-8.
Materials and methods
Test guideline
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Method not stated specifically for veratrole, but for a number of pesticide the methods was described. It is assumed that the same method was used for veratrole.
- GLP compliance:
- no
- Type of method:
- batch equilibrium method
- Media:
- soil
Test material
- Reference substance name:
- Veratrole
- EC Number:
- 202-045-3
- EC Name:
- Veratrole
- Cas Number:
- 91-16-7
- Molecular formula:
- C8H10O2
- IUPAC Name:
- 1,2-dimethoxybenzene
- Test material form:
- other: liquid
- Details on test material:
- No data
Constituent 1
- Radiolabelling:
- no
Study design
- Test temperature:
- No data
Batch equilibrium or other method
- Analytical monitoring:
- no
- Details on sampling:
- No data
- Details on matrix:
- COLLECTION AND STORAGE
- Geographic location: Warracknabeal, Victoria, South Australia
- Collection procedures: No data
- Sampling depth (cm): Surface horizon
- Storage conditions: No data
- Storage length: No data
- Soil preparation: ground to pass a 2 mm mesh
PROPERTIES
- Soil texture: No data
- Horizon: Surface
- Soil taxonomic classification: Dr 2.33
- Soil classification system: Northcote
- Soil series: No data
- Soil order: No data
- pH: 8.0
- Organic carbon (%): 1.09 (organic matter)
- CEC (meq/100 g): No data
- Carbonate as CaCO3: No data
- Insoluble carbonates (%): No data
- Extractable Cations (Ca, Mg, Na, K, H) (MEQ/100 g): No data
- Special chemical/mineralogical features: No data
- Clay fraction mineralogy: No data
- Moisture at 1/3 atm (%): No data
- Bulk density (g/cm3): No data
- Biomass (e.g. in mg microbial C/100 mg, CFU or other): No data - Details on test conditions:
- TEST CONDITIONS
- Buffer: None
- pH: No data
- Suspended solids concentration: 1-3 g/10mL
- other: 10 mg veratrole/L 0.01 M CaCl2
TEST SYSTEM
- Type, size and further details on reaction vessel: Glass-stoppered tubes
- Water filtered (i.e. yes/no; type of size of filter used, if any): No data
- Measuring equipment: No data
- Test performed in closed vessels due to significant volatility of test substance: Yes
- Method of preparation of test solution: 10 mg veratrole dissolved in 1L of 0.01 M CaCl2
- Are the residues from the adsorption phase used for desorption: no data
Duration of adsorption equilibration
- Sample No.:
- #1
- Duration:
- 2 h
- Initial conc. measured:
- 10 other: mg/L
- Computational methods:
- - Adsorption and desorption coefficients (Kd): 0.67
Results and discussion
Adsorption coefficient
- Type:
- Kd
- Value:
- 0.67
Results: Batch equilibrium or other method
- Adsorption and desorption constants:
- Kd = 0.67
- Details on results (Batch equilibrium method):
- No data
Any other information on results incl. tables
For 24 pesticides and 17 Australian soils (organic matter contents 0.19 -6.62%) the following relation was found: logKom = 0.52 logKow + 0.69. Using this equation Kd was calculated to 0.59 for veratrole (logKow = 2).
For the same 24 pesticides and the actual soil (organic matter content 1.09%) the following relation was found: LogKom = 0.59 logKow + 0.62. Using this equation Kd was calculated to 0.69 for veratrole (logKow = 2).
Applicant's summary and conclusion
- Validity criteria fulfilled:
- no
- Remarks:
- A number of information necessary to validate the quality of the data is not given in the paper.
- Conclusions:
- Adsorption coefficient was found as Koc = 0.67 (referred to as Kd) for one Australian soil with organic matter content of 1.09%.
This value fits very well with values that may be calculated from equations found for 24 pesticides and 17 Australian soils with organic matter contents of 0.19-6.62%, and the same 24 pesticides and the specific soil (organic matter content 1.09%): Koc equals 0.59 and 0.69, respectively.
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