1,4-Dioxaspiro[4.5]decane, 8-[4-(4-methylphenyl)-3-cyclohexen-1-yl]-

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:

2017-10-14 to 2018-05-07

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))

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))

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

HPLC estimation method

Media:

soil/sewage sludge

Details on study design: HPLC method:

EQUIPMENT
- Apparatus: HPLC equipment
- Column:
Stationary phase: Zorbax Eclipse XDB-CN
Material: stainless steel
- Detection system: variable wavelength detector

MOBILE PHASES
- Type: Methanol / demineralized water 55:45 % (v/v)
- pH: 6.4

DETERMINATION OF DEAD TIME
- Method: the dead time is determined by using a “dead time marker”

Key result

Type:

log Koc

Value:

5.5 dimensionless

pH:

6.4

Temp.:

25 °C

Details on results (HPLC method):

- Details of fitted regression line (log k' vs. log Koc): Details available in the section “Any other information on results including tables”
- Graph of regression line attached: Yes, in the section “Attached background material”

Individual results

Table 1: Determination of the dead time t₀

 

Dead time marker	tR / min 1^st Measurement	tR / min 2^nd Measurement	tR / min Mean
Formamide	1.71	1.71	1.71

 

Dead time: t₀ = 1.71 min

 

Table 2: Calibration data - 1^st measurement

 

Calibration substance	1^st Inj. tR / min	k	log k	log Koc
Acetanilide	2.16	0.27	-0.57	1.25
Atrazin	2.59	0.52	-0.28	1.81
Triadimenol	3.50	1.05	0.02	2.40
Linuron	3.96	1.32	0.12	2.59
Pyrazophos	6.93	3.06	0.49	3.65
Diclofop-methyl	9.01	4.28	0.63	4.20
4,4' DDT	24.74	13.50	1.13	5.63

 

Regression: LogK_oc =a + b . logk

Parameters: a = 2.506

b = 2.602

r²= 0.9864

 

Table 3: log K_oc of the test item - 1^st measurement

 

Test Item	1^st Inj. tR / min	k	log k	log Koc
Test item	25.24	13.80	1.14	5.47

 

Table 4: Calibration data – 2^nd measurement

 

Calibration substance	1^st Inj. tR / min	k	log k	log Koc
Acetanilide	2.17	0.27	-0.57	1.25
Atrazin	2.60	0.52	-0.28	1.81
Triadimenol	3.50	1.05	0.02	2.40
Linuron	3.94	1.31	0.12	2.59
Pyrazophos	6.90	3.05	0.48	3.65
Diclofop-methyl	9.00	4.27	0.63	4.20
4,4' DDT	24.65	13.45	1.13	5.63

 

Regression: log Koc = a + b . logk

Parameters: a = 2.504

b = 2.612

r²= 0.9870

 

Table 5: log K_oc of the test item - 2^nd measurement

 

Test Item	1^st Inj. tR / min	k	log k	log Koc
Test item	24.86	13.57	1.13	5.46

 

The test item had a mean adsorption coefficient log K_oc of 5.5.

Validity criteria fulfilled:

yes

Conclusions:

The adsorption coefficient of the test item was found to be log Koc= 5.5. The Koc was calculated to be 316227.77 L/kg.

Executive summary:

The adsorption coefficient of the test item was determined according to the HPLC method described in the EU Method C.19 and OECD TG 121. Under the test conditions, the adsorption coefficient of the test item was found to be log Koc= 5.5. The Koc was calculated to be 316227.77 L/kg.

Description of key information

The adsorption coefficient of the test item was found to be log K_oc= 5.5. The Koc was calculated to be 316227.77 L/kg (reference 5.4.1-1).

Key value for chemical safety assessment

Koc at 20 °C:

316 227.77

Additional information

The adsorption coefficient of the test item was determined according to the HPLC method described in the EU Method C.19 and OECD TG 121. Under the test conditions, the adsorption coefficient of the test item was found to be log Koc= 5.5. The Koc was calculated to be 316227.77 L/kg.