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EC number: 202-826-9 | CAS number: 100-18-5
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:
- 2011
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- The study was conducted using a documented method and in compliance with GLP.
- Reason / purpose for cross-reference:
- reference to same study
- 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))
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- HPLC estimation method
- Media:
- soil/sewage sludge
- Specific details on test material used for the study:
- Sponsor's identification p-diisopropylbenzene
Description Clear, colourless liquid
CAS number 100-18-5
Purity Not supplied
Date received 31 August 2011
Expiry date Not supplied
Storage conditions Room temperature, in the dark - Radiolabelling:
- no
- Details on study design: HPLC method:
- EQUIPMENT
HPLC system: Agilent technologies 1100 incorporating auto sampler
Column: Luna 5 μm CN (150* 4.6 mm id)
Column temperature: 30 °C
Mobile phase: methanol : water (55 : 45 v/v)
pH of mobile phase: 6.2
Flow-rate: 1.0 mL/min
Injection volume: 10 μL
UV detector wavelengh: 210 nm
DETERMINATION OF DEAD TIME
- Method: The dead time was determined by measuring the retention time of formamide (purity* 99.94 %) at 664 mg/L in mobile phase.
REFERENCE SUBSTANCES
- Identity: Acetanilide, phenol, atrazine, isoproturon, triadimenol, linuron, naphthalene, endosulfan-diol, fenthion, α-Endosulfan, phenanthrene, DDT - Type:
- log Koc
- Value:
- 3.8
- Temp.:
- 30 °C
- Remarks on result:
- other: Recorded temperature was column temperature.
- Details on results (HPLC method):
- - Retention times of reference substances used for calibration:
Formamide: 1.985 min. (Dead-time)
acetanilide: 2.343 min.
phenol: 2.405 min.
atrazine: 2.743 min.
isoproturon: 2.971 min.
triadimenol: 3.141 min.
linuron: 3.503 min.
naphthalene: 4.451 min.
endosulfan-diol: 3.489 min.
phenanthrene: 5.258 min.
α-endosulfan: 6.006 min.
phenanathrene: 7.315 min.
DDT: 14.818 min.
- Details of fitted regression line (log k' vs. log Koc):
y = 0.3374 x- 1.0141 R^2 = 0.9554
- Average retention data for test substance: 5.658 min. - Validity criteria fulfilled:
- yes
- Conclusions:
- The adsorption coefficient (Koc) of the test item has been determined to be 6.28 x 10E3, log10 Koc 3.80.
- Executive summary:
6.28 x 103, log10Koc 3.80, using the HPLC screening method, designed to be compatible with Method C19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for Testing of Chemicals, 22 January 2001.
Reference
The retention times, capacity factors and logio Koc values determined for the sample are shown in the following table:
| Peak | Retention time (mins) | Capacity factor (k) | Log10 k | Log10 Koc | ||
| injection 1 | injection 2 | Mean | ||||
| 1 | 5.661 | 5.656 | 5.658 | 1.85 | 0.267 | 3.80 |
Log10 Koc : 3.80
Adsorption coefficient: 6.28* 103
Discussion
The mobile phase was used at an approximately neutral pH as the test item had no dissociation constants within the environmentally relevant pH range.
Description of key information
6.28 x 103, log10Koc 3.80, using the HPLC screening method, designed to be compatible with Method C19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for Testing of Chemicals, 22 January 2001.
Key value for chemical safety assessment
- Koc at 20 °C:
- 6 280
Additional information
The adsorption coefficient (Koc) of the test item has been determined in a study according to EU Method C.19 (Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge Using High Performance Liquid Chromatography (HPLC)). The mobile phase was used at an approximately neutral pH as the test item had no dissociation constants within the environmentally relevant pH range.
The adsorption coefficient (Koc) of the test item has been determined to be 6.28 x 10E3, log10 Koc 3.80.
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