Cyclopropanemethanol, 1-methyl-2-[(1,2,2-trimethylbicyclo[3.1.0]hex-3-yl)methyl]-

Adsorption / desorption

Link to relevant study record(s)

Reference

Endpoint:

adsorption / desorption: screening

Type of information:

experimental study

Adequacy of study:

key study

Study period:

04 October, 2019 - 18 November, 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

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))

Version / remarks:

22 January, 2001

Deviations:

no

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))

Version / remarks:

30 May, 2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

HPLC estimation method

Media:

other: HPLC Method

Specific details on test material used for the study:

JAVANOL :
Batch No. : VE00594779
Purity : 91.9% (sum of the two isomers)
Expiry Date : 04 March, 2021

Radiolabelling:

no

Test temperature:

The determination was performed at 25 °C (temperature of the column), but the value obtained above can 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 tabulated reference substances log KOC values were determined. Adsorption coefficients of the test and reference substances are assumed to vary with temperature in the same way.

Details on study design: HPLC method:

Principle of the method :

Reverse phase High Performance Liquid Chromatography on cyanopropyl-modified silica stationary phase, containing lipophilic and polar moieties, is used.

While passing through the column among with the mobile phase the test substance interacts with the stationary phase. As a result of the partitioning between the mobile and stationary phase the test substance is retarded. The dual-composition of the stationary phase having polar and non-polar sites allows for interaction of polar and non-polar groups of a molecule in a similar way as it is the case for organic matter in soil or sewage sludge matrices. This enables the relationship between the retention time on the column and the adsorption coefficient on organic matter to be established.


Equipment and conditions :

HPLC equipment: Perkin Elmer (series 200) HPLC system comprising:
- a high pressure pump (module N2910102, serial number: 291N8051901A)
- an auto-sampler (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, Nucleodur 100-5 CN-RP
(Macherey-Nagel)
serial number: E15120578, batch 34514011

- Mobile phase : methanol / water 55/45 (v/v)

- Flow rate : 1.0 ml/min.

- Column temperature : 25 °C

- Injected volume : 100 µL


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.

On the day of the determination a calibration mixture of these seven substances in methanol / water 55/45 (v/v) was prepared.

Reference Substance LogKoc
Formamide dead-time
2-Nitrobenzamide 1.45
Methyl Benzoate 1.80
Naphthalene 2.75
1,2,3-Trichlorobenzene 3.16
Phenanthrene 4.09
4,4'-DDT 5.63

Key result

Sample No.:

#1

Type:

log Koc

Remarks:

HPLC Method

Value:

3.8 L/kg

Temp.:

25 °C

Matrix:

HPLC Method

Sample No.:

#2

Type:

log Koc

Value:

3.8

Temp.:

25 °C

Matrix:

HPLC Method

Details on results (HPLC method):

The chromatograms of Javanol show one main peak (~99.4% rel. peak area) at an average retention time of 9.488 minutes, corresponding to an adsorption coefficient (log value) of 3.8, and one minor peak (~0.6% rel. peak area) at an average retention time of 14.668 minutes, corresponding to an adsorption coefficient (log value) of 4.5.


Therefore: Adsorption coefficients (KOC) of Javanol:


log Koc = 3.8 (main peak)

A further minor peak (representing 0.6% of relative surface area) was observed to have a LogKoc of 4.5.

Validity criteria fulfilled:

yes

Conclusions:

The chromatograms of Javanol show one main peak (~99.4% rel. peak area) at an average retention time of 9.488 minutes, corresponding to an adsorption coefficient (log value) of 3.8, and one minor peak (~0.6% rel. peak area) at an average retention time of 14.668 minutes, corresponding to an adsorption coefficient (log value) of 4.5.


Therefore: Adsorption coefficients (KOC) of Javanol:


log Koc = 3.8 (main peak)

A further minor peak (representing 0.6% of relative surface area) was observed to have a LogKoc of 4.5.

Description of key information

The Log Koc for JAVANOL is 3.8.

This value of Log Koc suggests strong sorption to soil and sediment, negligible to slow migration potential to groundwater.

.

Key value for chemical safety assessment

Koc at 20 °C:

6 310

Additional information

The Log Koc for JAVANOL is 3.8.

This value of Log Koc suggests strong sorption to soil and sediment, negligible to slow migration potential to groundwater.