N,N',N'',N'''-tetrakis(4,6-bis(butyl-(N-methyl-2,2,6,6-tetramethylpiperidin-4-yl)amino)triazin-2-yl)-4,7-diazadecane-1,10-diamine

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:

From Jun. 20, 1995 to Aug. 2, 1995

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP-guideline study with acceptable deviations

Qualifier:

according to guideline

Guideline:

OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)

Deviations:

yes

Remarks:

Not possible to perform the complete adsorption/desorption test, therefore the test performance included only a screening test.

GLP compliance:

yes (incl. QA statement)

Type of method:

batch equilibrium method

Media:

soil

Radiolabelling:

no

Test temperature:

room temperature

Analytical monitoring:

yes

Details on sampling:

- Concentrations: 1.11 mg/L initial exposure concentration
- Sampling interval: after 2 hours

Details on matrix:

COLLECTION AND STORAGE
Soils were provided by the Ispra Establishment / Joint Research Centre and no further pretreatment (e.g. sieving, sterilization etc.) was carried out.

Matrix PROPERTIES
See Table. 1: Pedological characterization of the soils

Details on test conditions:

TEST SYSTEM
For every soil 2 samples were prepared. Every test vial (250 ml glass centrifuge vial with ground glass stopper) was filled with 20 g of soil (dry weight), after which 100 ml of test solution (concentration 1.11 mg/l in 0.01 M CaCl2-solution) were added. So the ratio soil/solution was 1/5 (w/w). The soil/water-mixtures were agitated on a mechanical shaker to maintain the soil in suspension. The test was performed at room temperature.

After 2 h the aqueous phase was separated by centrifugation. The concentrations of the test substance in the supernatants were determined by HPLC after concentrated by liquid/liquid phase extraction.

Sample No.:

#1

Duration:

2 h

Initial conc. measured:

0.222 other: mg/kg soil d.w., nominal

Sample No.:

#2

Duration:

2 h

Initial conc. measured:

0.222 other: mg/kg soil d.w., nominal

Sample No.:

#3

Duration:

2 h

Initial conc. measured:

0.222 other: mg/kg soil d.w., nominal

Sample No.:

#4

Duration:

2 h

Initial conc. measured:

0.222 other: mg/kg soil d.w., nominal

Sample No.:

#5

Duration:

2 h

Initial conc. measured:

0.222 other: mg/kg soil d.w., nominal

Type:

Koc

Value:

> 4 682

Adsorption and desorption constants:

See Table 2

Transformation products:

no

	Eurosoil 1	Eurosoil 2	Eurosoil 3	Eurosoil 4	Eurosoil 5
Final concentration after correction (blank subtracted) [µg/l]	< detect. limit	< detect. limit	< detect. limit	< detect. limit	< detect. limit
Concentration of substance in the soil after adsorption [µg/g]	>4.10	>4.10	>4.10	>4.10	>4.10
Quantity adsorbed [%]	>92.4	>92.4	>92.4	>92.4	>92.4
Adsorption partition coefficient (k’)	>60.9	>60.9	>60.9	>60.9	>60.9
K'oc	>4682	>1645	>1739	>3804	>662

Detect. limit: 67.4 µg/l

 

Table 2: Adsorption of Chimassorb 119 / Eurosoils 1 – 5 (mean values) (concentration of the test solution: 0.43 µg/l)

For all soils the values of the concentrations of the test substance in equilibrium state were below the detection limit. Therefore the adsorption as well as the K'oc-values could only be estimated from the detection limit.

Description of key information

Adsorption to solid soil phase is expected.

Additional information

In a GLP-study according to OECD guideline 106, the adsorption/desorption characateristics were tested for 5 soils. In the equilibrium state for all soils the values of the concentrations of the compound in the extracts were below the detection limit (67.4 µg/l) and the adsorption as well as the K’oc-values could only be estimated from the detection limit. The resulting K’oc-values ranged from >662 to >4682.