Registration Dossier
Registration Dossier
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EC number: 943-533-2 | CAS number: -
Adsorption / desorption
Administrative data
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Study performed according to GLP and guideline
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 014
- Report date:
- 2014
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.19 (Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge Using High Performance Liquid Chromatography (HPLC))
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- HPLC estimation method
- Media:
- soil/sewage sludge
Test material
- Reference substance name:
- Reaction mass of 6-ethyl-3-methyloct-5-en-1-ol and 6-ethyl-3-methyloct-6-en-1-ol
- Molecular formula:
- C11H22O
- IUPAC Name:
- Reaction mass of 6-ethyl-3-methyloct-5-en-1-ol and 6-ethyl-3-methyloct-6-en-1-ol
- Test material form:
- other: liquid
- Details on test material:
- Commercial name: Super Muguet
Chemical Nature: 6-ethyl-3-methyl-6-octen-ol and 6-ethyl-3-methyl-5-octen-ol
Molecular formula: C11H22O
Molecular weight: 170.29 g/mol
CAS No.: 26330-64-3, 26330-65-4
Aspect: colourless to pale yellow liquid
Constituent 1
Study design
HPLC method
- Details on study design: HPLC method:
- Equipment and procedures:
HPLC equipment: Perkin Elmer (series 200) HPLC system comprising:
- a high pressure pump (module N2910102, serial number: 291N8051901A)
- an autosampler (module N2930100, serial number: 293N8052404A)
- a column compartment (module N2601581, serial number: OVH0802151130)
- a refractive index detector (series 200a, serial number 125829)
- Column: 250 mm x 4.6 mm i.d., Nucelodur® 100-5 CN-RP (Macherey-Nagel) serial number: N8030929, batch 3034
- Mobile phase: methanol/water 55/45 (v/v))
- Flow rate: 1.0 ml/min
- Column temperature: 35°C
- Injected volume: 100µl
Reference substances:
Six substances were chosen having log Koc ranging from 1.45 to 5.63. Formamide is used as an unretained compound for the determination of the dead time t0.
HPLC procedure:
A solution of the test substance was prepared 10.0 mg in 25 ml methanol/water 55/45 v/v).
After equilibration of the HPLC system, the calibration mixture was injected first, followed by the test chemical solution twice and the calibration mixture again.
Retention times tR were measured and averaged and the decimal logarithms of the capacity factors k were calculated. The linear regression parameters of the relationship
Log Koc = f(log k)
Were also calculated from the data obtained with the calibration mixture and, therewith, log Koc of the test substance was determined from its measured capacity factor.
Finally solutions of the reference substances were injected individually to confirm the peak assignment.
Results and discussion
Adsorption coefficient
- Type:
- log Koc
- Value:
- 3.02
- Temp.:
- 35 °C
Results: HPLC method
- Details on results (HPLC method):
- The chromatograms of Super Muguet show one peak at an average retention time of 5.585 minutes, corresponding to an adsorption coefficient (log value) of 3.02.
Note: The determination was performed at 35°C (temperature of the column), but the value obtained above can only be considered to represent the value at an unspecified, probably ambient temperature since no mention is made in the guidelines of the temperature at which the reference substances logKoc values were determined. Adsorption coefficients of the test and reference substances are assumed to vary with temperature in the same way.
Applicant's summary and conclusion
- Conclusions:
- The adsorption coefficient (Koc) of Super Muguet was log Koc = 3.02
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