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EC number: - | CAS number: 1309389-73-8
Adsorption / desorption
Administrative data
Link to relevant study record(s)
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 30 March 2020 - 30 September 2020
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
- Version / remarks:
- 2000
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- batch equilibrium method
- Media:
- soil
- Radiolabelling:
- no
- Test temperature:
- room temperature
- Details on study design: HPLC method:
- EQUIPMENT
- Apparatus: HPLC (used for tier 1 and tier 2)
- Type: HPLC 2695 (C2019-003) Waters Co. Ltd.
- Column: Agilent Eclipse XDB-C18 /4.6 mm x 150 mm, 5 µm)
- Mobile phase: acetonitrile/water = 60/40
- Flow rate: 1.0 mL/min
- Detector: UV
- detection wavelength: 230 nm
- Injection volume: 10.0 µL
- Oven temp.: 30 °C
- Software: Empower 3
- Apparatus: LC-MS/MS (used for tier 3)
- LC system: Shimadzu LC 20AD
- Mass spectrometer: AB Sciex API 4000 Q Trap
- Column: Agilent Zorbax Extend C18 (2.1 x 50 mm, 3.5 µm)
- Software version: Analyst 1.6.3 - Key result
- Sample No.:
- #1
- Type:
- log Koc
- Value:
- 3.722 dimensionless
- Matrix:
- soil
- Remarks on result:
- other: Red soil, isotherm equation: logCs = 0.9814 x logCe +1.7737
- Key result
- Sample No.:
- #2
- Type:
- log Koc
- Value:
- 4.496 dimensionless
- Matrix:
- soil
- Remarks on result:
- other: Black soil, isotherm equation: logCs = 0.9986 x logCe +2.5609
- Key result
- Sample No.:
- #3
- Type:
- log Koc
- Value:
- 4.812 dimensionless
- Matrix:
- soil
- Remarks on result:
- other: Aquic-brown soil, isotherm equation: logCs = 1.0218 x logCe +2.8893
- Key result
- Sample No.:
- #4
- Type:
- log Koc
- Value:
- 4.048 dimensionless
- Matrix:
- soil
- Remarks on result:
- other: Moisture soil, isotherm equation: logCs = 0.9855 x logCe +2.1674
- Key result
- Sample No.:
- #5
- Type:
- log Koc
- Value:
- 4.487 dimensionless
- Matrix:
- soil
- Remarks on result:
- other: Loess soil, isotherm equation: logCs = 1.0015 x logCe +2.6380
- Validity criteria fulfilled:
- yes
- Conclusions:
- Using the batch equilibrium method according OECD No. 106, the log Koc value was determined for five different soils:
Red soil: log Koc = 3.722
Black soil: log Koc = 4.496
Aquic-brown soil: log Koc = 4.812
Moisture soil: log Koc = 4.048
Loess soil log Koc = 4.487. - Executive summary:
In a batch equilibrium method according OECD No. 106, the logKoc value was determined for five different soils. The five soil samples originated from different locations in China (soils named: red soil, black soil, aquic-brown soil, moisture soil and loess soil).
In the HPLC analyses for tier 1 and tier 2 tests, the recovery was measured in 0.01 mol/L CaCl2 solution at two concentrations: 0.01 mg/L and 0.1 mg/L. The mean recovery rate was in the range of 94 % - 100 % with RSD in the range of 1 to 4 %. The mean recovery in the five soils (0.5 mg/kg) was in the range of 85 to 95 % with RSD of 3 to 15 %. In the tier 3 test, the analysis was performed by LC-MS/MS. The mean recovery in 0.01 mol/L CaCl2 solution at 0.0005 mg/L was 104.2 % with RSD of 3.2 %. The mean recovery in the five soils (0.01 mg/kg) was 92.8 to 95.0 % with RSD of 2.0 to 5.7 %. The present analytical method met the quality criteria.
In the tier 3 test, the solution:soil ratio of 25:1 for red soil, 100:1 for black soil, loess soil, aquic-brown soil and moisture soil was used. An equilibrium time of 24 h was selected for red soil and moisture soil and 28 hour for aquic-brown soil, loess soil and black soil. Both, aqueous and soil, phases were measured. The isotherm equations and logKoc values of the test item on soils were determined as follows:
Red soil: logCs = 0.9814 x logCe +1.7737; logKoc = 3.722
Black soil: logCs = 0.9986 x logCe +2.5609; logKoc = 4.496
Aquic-brown soil: logCs = 1.0218 x logCe +2.8893; logKoc = 4.812
Moisture soil: logCs = 0.9855 x logCe +2.1674; logKoc = 4.048
Loess soil: logCs = 1.0015 x logCe +2.6380; logKoc = 4.487.
Reference
Description of key information
Using the batch equilibrium method according OECD No. 106, the log Koc value was determined for five different soils:
Red soil: log Koc = 3.722
Black soil: log Koc = 4.496
Aquic-brown soil: log Koc = 4.812
Moisture soil: log Koc = 4.048
Loess soil log Koc = 4.487.
Key value for chemical safety assessment
- Koc at 20 °C:
- 4.812
Additional information
In a batch equilibrium method according OECD No. 106, the logKoc value was determined for five different soils. The five soil samples originated from different locations in China (soils named: red soil, black soil, aquic-brown soil, moisture soil and loess soil).
In the HPLC analyses for tier 1 and tier 2 tests, the recovery was measured in 0.01 mol/L CaCl2 solution at two concentrations: 0.01 mg/L and 0.1 mg/L. The mean recovery rate was in the range of 94 % - 100 % with RSD in the range of 1 to 4 %. The mean recovery in the five soils (0.5 mg/kg) was in the range of 85 to 95 % with RSD of 3 to 15 %. In the tier 3 test, the analysis was performed by LC-MS/MS. The mean recovery in 0.01 mol/L CaCl2 solution at 0.0005 mg/L was 104.2 % with RSD of 3.2 %. The mean recovery in the five soils (0.01 mg/kg) was 92.8 to 95.0 % with RSD of 2.0 to 5.7 %. The present analytical method met the quality criteria.
In the tier 3 test, the solution:soil ratio of 25:1 for red soil, 100:1 for black soil, loess soil, aquic-brown soil and moisture soil was used. An equilibrium time of 24 h was selected for red soil and moisture soil and 28 hour for aquic-brown soil, loess soil and black soil. Both, aqueous and soil, phases were measured. The isotherm equations and logKoc values of the test item on soils were determined as follows:
Red soil: logCs = 0.9814 x logCe +1.7737; logKoc = 3.722
Black soil: logCs = 0.9986 x logCe +2.5609; logKoc = 4.496
Aquic-brown soil: logCs = 1.0218 x logCe +2.8893; logKoc = 4.812
Moisture soil: logCs = 0.9855 x logCe +2.1674; logKoc = 4.048
Loess soil: logCs = 1.0015 x logCe +2.6380; logKoc = 4.487.
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