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Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
Experimental test result performed using standard test guidelines
Qualifier:
according to
Guideline:
OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))
Principles of method if other than guideline:
Adsorption coefficient of test chemical Tetraethylammonium chloride (CAS No. 56-34-8) was determined by using HPLC method.
GLP compliance:
no
Type of method:
HPLC estimation method
Media:
soil/sewage sludge
Radiolabelling:
no
Test temperature:
25°C
Details on study design: HPLC method:
HPLC Procedure:
The solutions of the test substance and reference substances were prepared in solvent mentioned in 4.3. Each of the reference substance and test substance were analysed by HPLC at 210 nm. After equilibration of the HPLC system, Urea was injected first, the reference substances were injected in duplicate, followed by the test chemical solution in duplicate. Reference substances were injected again after test sample, no change in retention time of reference substances was observed. Retention time tR were measured, averaged and the decimal logarithms of the capacity factors k were calculated. The graph was plotted between log Koc versus log k(table 3).The linear regression parameter of the relationship log Koc vs log k were also calculated from the data obtained with calibration samples and therewith, log Koc of the test substance was determined from its measured capacity factor.

Operating Conditions:
HPLC Model No. : Agilent Technologies,1260 Infinity
Flow Rate : 1.0ml/min
Column : ZORBAX Eclipse Plus C18, 4.6×100mm, 3.5 μm
Mobile phase : ACN : water (55:45)
Temperature : 25°C
Detector : Diode Array Detector @210nm
Injector : Autosampler
Injector volume : 10μl
Data Acquisition software : ChemStationOpen lab Control Panel
Analytical monitoring:
not specified
Key result
Sample No.:
#1
Type:
Koc
Value:
1.808 dimensionless
Temp.:
25 °C
Remarks on result:
other: other details not specified
Details on results (HPLC method):
The Adsorption coefficient (KOC) on soil and on sewage sludge of the test chemical was determined to be 1.808 ± 0.002 at 25°C
Transformation products:
not specified

Tables:

Table 1:

Reference substance

Log Koc

Rt1

Rt2

Rt3

Mean Rt ± S.D.

k

Log k

Urea

NA

0.968

0.968

NA

0.968±0.000

0

0

2-nitrophenol

2.47

3.108

3.108

NA

3.108±0.000

2.21

0.3444

Nitrobenzene

2.35

3.117

3.121

NA

3.119±0.003

2.222

0.3467

4-Nitrobenzamide

1.43

1.519

1.519

NA

1.519±0.000

0.569

-0.2449

N,Ndimethylbenzamide

1.52

1.717

1.719

NA

1.718±0.001

0.774

-0.1113

N-methylbenzamide

1.3

1.472

1.47

NA

1.471±0.001

0.519

-0.2848

Benzamide

1.239

1.333

1.334

NA

1.3335±0.001

0.3775

-0.4231

 

Table 2:

Test substance

Tetraethylammonium chloride

K

Log K

Log Koc

by Generalized Calibration

Graph

Mean of Log Koc ± S.D.

Rt1

1.919

0.982

-0.008

1.806

1.808 ± 0.002

Rt2

1.923

0.987

-0.006

1.809

 

Validity criteria fulfilled:
yes
Conclusions:
The Adsorption Coefficient of test substance was determined as per the HPLC method (OECD Guideline-121). The Log Koc value was determined to be 1.808 ± 0.002 at 25°C. Thus based on the result it is concluded that the test substance has a low sorption to soil and sediment and therefore has moderate migration potential to ground water.
Executive summary:

The adsorption coefficient Koc in soil and in sewage sludge of test chemical was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 121 for testing of Chemicals. The solutions of the test substance and reference substances were prepared in appropriate solvents. A test item solution was prepared by accurately weighing 5 mg of test item and diluted with Methanol up to 10ml. Thus, the test solution concentration was 500 mg/l. The pH of test substance was 6.3. Each of the reference substance and test substance were analysed by HPLC at 210 nm. After equilibration of the HPLC system, Urea was injected first, the reference substances were injected in duplicate, followed by the test chemical solution in duplicate. Reference substances were injected again after test sample, no change in retention time of reference substances was observed. Retention time tR were measured, averaged and the decimal logarithms of the capacity factors k were calculated. The graph was plotted between log Koc versus log k(Annex - 2).The linear regression parameter of the relationship log Koc vs log k were also calculated from the data obtained with calibration samples and therewith, log Koc of the test substance was determined from its measured capacity factor. The six reference substances, 2 - nitrophenol, Nitrobenzene, 4-Nitrobenzamide, N,N-dimethylbenzamide, Nmethylbenzamide, Benzamide were chosen having Koc value range from 1.239 to 2.47 .The Log Koc value of test chemical was determined to be 1.808 ± 0.002 dimensionless at 25°C.This log Koc value indicates that the substance has a low sorption to soil and sediment and therefore have moderate migration potential to ground water.

Description of key information

The Adsorption Coefficient of test substance was determined as per the HPLC method (OECD Guideline-121). The Log Koc value was determined to be 1.808 ± 0.002 at 25°C. Thus based on the result it is concluded that the test substance has a low sorption to soil and sediment and therefore has moderate migration potential to ground water.

Key value for chemical safety assessment

Koc at 20 °C:
64.26

Additional information

The adsorption coefficient Koc in soil and in sewage sludge of test chemical was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 121 for testing of Chemicals. The solutions of the test substance and reference substances were prepared in appropriate solvents. A test item solution was prepared by accurately weighing 5 mg of test item and diluted with Methanol up to 10ml. Thus, the test solution concentration was 500 mg/l. The pH of test substance was 6.3. Each of the reference substance and test substance were analysed by HPLC at 210 nm. After equilibration of the HPLC system, Urea was injected first, the reference substances were injected in duplicate, followed by the test chemical solution in duplicate. Reference substances were injected again after test sample, no change in retention time of reference substances was observed. Retention time tR were measured, averaged and the decimal logarithms of the capacity factors k were calculated. The graph was plotted between log Koc versus log k(Annex - 2).The linear regression parameter of the relationship log Koc vs log k were also calculated from the data obtained with calibration samples and therewith, log Koc of the test substance was determined from its measured capacity factor. The six reference substances, 2 - nitrophenol, Nitrobenzene, 4-Nitrobenzamide, N,N-dimethylbenzamide, Nmethylbenzamide, Benzamide were chosen having Koc value range from 1.239 to 2.47 .The Log Koc value of test chemical was determined to be 1.808 ± 0.002 dimensionless at 25°C.This log Koc value indicates that the substance has a low sorption to soil and sediment and therefore have moderate migration potential to ground water.