1,2,3,4-tetrahydronaphthalene

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:

2010-05-04 - 2010-05-25

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: 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:

(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:

(2008)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

HPLC estimation method

Media:

soil/sewage sludge

Radiolabelling:

no

Test temperature:

23-24ºC

Details on study design: HPLC method:

EQUIPMENT
- Apparatus: HPLC System HP 1100 (Agilent) with refractometer HP 1100 (Agilent)
- Type, material and dimension of analytical (guard) column: Zorbax CN, 250 x 4 mm, 5 µm
- Detection system: refractive index

MOBILE PHASES
- Type: methanol / water (purified) 55/45 (v/v)
- Experiments with additives carried out on separate columns: no
- Solutes for dissolving test and reference substances: Solvent 1: methanol / water (purified) 55/45 (v/v); Solvent 2: methanol

DETERMINATION OF DEAD TIME
- Method: by inert substances which are not retained by the column

REFERENCE SUBSTANCES
- Identity: Urea (inert marker),Atrazine, Monuron, Triapenthenol, Linuron, Naphthalene, Fenthion, Trifluralin

DETERMINATION OF RETENTION TIMES
- Quantity of test substance introduced in the column: 49.10 mg /25 mL solvent
- Quantity of reference substances:
Urea 28.37 mg / 25 ml eluent
Atrazine 21.14 mg / 25 ml solvent 1
Monuron 21.42 mg / 25 ml solvent 1
Triapenthenol 21.52 mg / 25 ml solvent 1
Linuron 20.29 mg / 25 ml solvent 1
Naphthalene 25.42 mg / 25 ml solvent 2
Fenthion 34.30 mg / 25 ml solvent 2
Trifluralin 21.80 mg / 25 ml solvent 2

- Intervals of calibration: -

REPETITIONS
- Number of determinations: 2

EVALUATION
- Calculation of capacity factors k':
Atrazine 0.675
Monuron 0.760
Triapenthenol 1.411
Linuron 1.793
Naphthalene 1.667
Fenthion 3.858
Trifluralin 7.695
Test substance1.805

- Calculation of retention times :
Urea 2.46 min.
Atrazine 4.12 min.
Monuron 4.33 min.
Triapenthenol 5.93 min.
Linuron 6.87 min.
Naphthalene 6.56 min.
Fenthion 11.95 min.
Trifluralin 21.39 min.
Test substance 7.01 min.

- Determination of the log Koc value:
Atrazine 1.81
Monuron 1.99
Triapenthenol 2.37
Linuron 2.59
Naphthalene 2.75
Fenthion 3.31
Trifluralin 3.94
Test substance 2.7

Type:

Koc

Value:

501

Temp.:

23 °C

Remarks on result:

other: HPLC method

Details on results (HPLC method):

- Retention times of reference substances used for calibration:
Urea 2.46
Atrazine 4.12
Monuron 4.33
Triapenthenol 5.93
Linuron 6.87
Naphthalene 6.56
Fenthion 11.95
Trifluralin 21.39


- Details of fitted regression line (log k' vs. log Koc): y =1.9767 * x + 2.1695; r2= 0.9939
- Average retention data for test substance: 7.01 minutes

Validity criteria fulfilled:

yes

Conclusions:

The adsorption coefficient on soil (KOC) of the test item 1,2,3,4-tetrahydronaphthalene was determined according to OECD guideline no. 121 [2001] and EU test method C.19 [2008]. The adsorption coefficient on soil (KOC) for this substance was calculated to be KOC = 501 mL/g (log KOC = 2.7; 23-24 ºC).

Executive summary:

The adsorption coefficient on soil (KOC) of the test item 1,2,3,4-tetrahydronaphthalene was determined according to OECD guideline no. 121 [2001] and EU test method C.19 [2008]. According to this method the test substance is passed through an HPLC column.The dual composition of the stationary phase having polar and non-polar sites allows for interaction of polar and non-polar groups in a similar way as 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 through the capacity factor K.

The adsorption coefficient on soil (KOC) for this substance was obtained to be KOC = 501 (log KOC = 2.7; 23 -24 ºC) .

The correlation betwen log K and log Koc was good with an r2= 0.9939.

Description of key information

The adsorption coefficient on soil (KOC) of 1,2,3,4-tetrahydronaphthalene was determined according to OECD guideline no. 121 [2001] and EU test method C.19 [2008]. The resulting KOC was 501 mL/g ( 23-24 ºC).

Key value for chemical safety assessment

Koc at 20 °C:

501

Additional information