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Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption
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:
1981
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
Name:
Unnamed
Type:
Constituent
Test material form:
other: liquid
Details on test material:
No data
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.