Di-tert-butyl sec-butylidene diperoxide

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:

Experimental starting date: 8-1-2016 Experimental completion date: 8-1-2016

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))

GLP compliance:

yes (incl. QA statement)

Type of method:

HPLC estimation method

Media:

soil/sewage sludge

Specific details on test material used for the study:

Batch/Lot no.: 1211442406
Appearance: Colorless clear liquid
Storage: Approx. 5°C
Expiry date: December 1, 2022

Radiolabelling:

no

Test temperature:

30°C

Details on study design: HPLC method:

Column: Grace Platinum Cyano 5μ, 150x4.6mm
Column temperature: 30°C
Injection volume: 20 μL
Mobile phase: Methanol:HPLC grade water = 25:75 (v/v%)
Flow rate: 0.7 mL/min
Detection: UV, 210 nm
Integration software: Chromeleon version 7.2

Key result

Sample No.:

#1

Type:

log Koc

Value:

1.91 dimensionless

Temp.:

20 °C

Details on results (HPLC method):

In the test, the average log Koc value for the test substance was calculated with the retention time of two injections, using the calibration plot of log k’ versus log Koc of the selected reference substances. The average measured log Koc value for the test substance, as determined from the test, was calculated to be 1.91. The test substance had a Koc of 81.

The average retention times of the reference substances as well as the test substance, corrected for the dead time, are presented below. This table contains also the theoretical log K_oc values of the

reference substances as taken from the OECD guideline 121 and the calculated values for log k’.

Average retention times of the reference substances and test substance

Substance	log Koctheoretical	Average retention time (min)	Average net retention time (min)	Average log k’	log Koccalculated
Thiourea (dead time)		2.64	0
Acetanilide	1.25	3.14	0.51	-0.72
Methyl benzoate	1.80	3.61	0.98	-0.43
Aniline	2.07	3.39	0.76	-0.54
Napthalene	2.75	5.25	2.62	0.00
1,2,3-trichlorobenzene	3.16	5.04	2.41	-0.04
Phenanthrene	4.09	10.40	7.76	0.47
Test substance T14013		3.51	0.88	-0.48	1.91

In the test, the average log K_oc value for the test substance was calculated with the retention time of two injections, using the calibration plot of log k’ versus log Koc of the selected reference substances. The average measured log K_oc value for the test substance, as determined from the test, was calculated to be 1.91. The test substance had a K_oc of 81.

Conclusions:

The adsorption coefficient (Koc) of the test substance was estimated using the High Performance Liquid Chromatography (HPLC) method. The Koc test was performed in accordance with the OECD guideline
121. The data on Koc can be used to predict the potential of the test substance to partition to soil, sediment or sewage sludge.
The average log Koc value for the test substance calculated from the test was 1.91, which is equal to a Koc of 81.

Executive summary:

The adsorption coefficient (K_oc) of the test substance was estimated using the High Performance Liquid Chromatography (HPLC) method. The K_oc test was performed in accordance with the OECD guideline

121. The data on K_oc can be used to predict the potential of the test substance to partition to soil, sediment or sewage sludge.

The average log K_oc value for the test substance calculated from the test was 1.91, which is equal to a K_oc of 81.

Description of key information

The adsorption coefficient (Koc) of the test substance was estimated using the High Performance Liquid Chromatography (HPLC) method. The Koc test was performed in accordance with the OECD guideline

121. The average log Koc value for the test substance calculated from the test was 1.91, which is equal to a Koc of 81.

Key value for chemical safety assessment

Koc at 20 °C:

81

Additional information

[LogKoc: 1.91]