Registration Dossier
Registration Dossier
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EC number: 203-808-3 | CAS number: 110-85-0
Adsorption / desorption
Administrative data
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Study performed according to guidelines, but non GLP .
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 003
- Report date:
- 2003
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
- GLP compliance:
- no
- Type of method:
- batch equilibrium method
- Media:
- soil
Test material
- Reference substance name:
- Piperazine
- EC Number:
- 203-808-3
- EC Name:
- Piperazine
- Cas Number:
- 110-85-0
- Molecular formula:
- C4H10N2
- IUPAC Name:
- piperazine
Constituent 1
- Radiolabelling:
- no
Study design
- Test temperature:
- 21.2°C
Batch equilibrium or other method
- Analytical monitoring:
- yes
Results and discussion
Adsorption coefficientopen allclose all
- Type:
- Koc
- Value:
- 507
- Temp.:
- 21 °C
- % Org. carbon:
- 1.4
- Type:
- Kd
- Value:
- 7.9
- Temp.:
- 21 °C
- % Org. carbon:
- 1.4
Results: Batch equilibrium or other method
- Transformation products:
- not measured
Any other information on results incl. tables
| Adsorption: | sorption (%) | Kd (ml/g) | CEC | f OC(%) | KOC |
| sandy loam | 80.3 | 20.1 | 5.3 | 0.9 | 2233 |
| loam | 61.3 | 7.9 | 13.1 | 1.4 | 507 |
| sand | 75.5 | 15.3 | 11.3 | 2.4 | 637 |
| Desorption: | |||||
| sandy loam | 13.9 | 34.2 | 5.3 | 0.9 | |
| loam | 32.4 | 11.9 | 13.1 | 1.4 | |
| sand | 15.8 | 31.3 | 11.3 | 2.4 | |
| Koc is not correlated to the organic carbon fraction | |||||
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Conclusions:
- The sorption/desorpion study of piperazine on soil, which was performed according to OECD 106 resulted in Kd values for three different soils. For Loam soil, sand soil and Sandy loam soil, Kd values of respectively 7.9, 15.3 and 20.1 L/kg were observed.
The mean value of 14.43 L/kg of these three observed Kd values will be used for risk assessment. The highest sorption was observed in the soil with the lowest OC content. The Koc was therefore not used as sorption occurs based on ionic interaction and not based on hydrophobic inter action. - Executive summary:
An absorption/desorption screening test was performed according to OECD 106 guideline. Three soils were tested, sandy loam, loam and sand. Kd values between 7.9 and 20.1 L/kg was measured.
The mean value of 14.43 L/kg of these three observed Kd values will be used for risk assessment.
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