Sodium naphthalene-1-sulphonate

Adsorption / desorption

Link to relevant study record(s)

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:

Data is from experimental study performed using standard OECD Guideline

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))

Principles of method if other than guideline:

To determine Adsorption coefficient (KOC) on soil and on sewage sludge of the test chemical sodium naphthalene-1-sulfonate (CAS No. 130-14-3) using HPLC.

GLP compliance:

no

Type of method:

HPLC estimation method

Media:

soil/sewage sludge

Specific details on test material used for the study:

- Name of test material: sodium naphthalene-1-sulfonate
- Molecular formula: C10H7NaO3S
- Molecular weight: 230.218 g/mol
- Smiles notation: c12c(S(=O)(=O)[O-])cccc1cccc2.[Na+]
- InChl: 1S/C10H8O3S.Na/c11-14(12,13)10-7-3-5-8-4-1-2-6-9(8)10;/h1-7H,(H,11,12,13);/q;+1/p-1
- Substance type: Organic
- Physical state: Solid

Radiolabelling:

not specified

Test temperature:

25°C

Details on study design: HPLC method:

The solutions of the test substance and reference substances were prepared in appropriate solvents. 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.

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 : Acetonitrile: 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

Details on sampling:

- Concentrations: 400 mg/l
- Sampling interval: A test item solution was prepared by accurately weighing 4 mg of test item and diluted with Acetonitrile up to 10 ml. Thus, the test solution concentration was 400 mg/l. The pH of test substance was 6.5.

Key result

Type:

log Koc

Value:

1.255 dimensionless

pH:

6.5

Temp.:

25 °C

Remarks on result:

other: Log Koc value reported as 1.255 ± 0.008

Details on results (HPLC method):

The Adsorption coefficient (KOC) on soil and on sewage sludge of the Sodium naphthalene-1-sulphonate (CAS No. 130-14-3) was determined to be 1.255 ± 0.008 at 25°C

Transformation products:

not specified

Table: 1

Reference substance	Log Koc	Rt1	Rt2	Rt3	Mean Rt ± S.D.	k	Log k
Urea	NA	0.887	0.887	0.888	0.887±0.008	0	0
Acetanilide	1.25	1.265	1.267	NA	1.266±0.001	0.4273	-0.3693
N-methylaniline	2.28	2.303	2.294	NA	2.2985±0.006	1.5913	0.2018
p-toluamide	1.78	1.18	1.182	NA	1.181±0.001	0.3315	-0.4796
2,5-Dichloroaniline	2.58	3.548	3.574	NA	3.561±0.018	3.0147	0.4792
4-nitrophenol	2.46	1.559	1.56	NA	1.5595±0.001	0.7582	-0.1202
2-nitrophenol	2.47	2.213	2.224	NA	2.2185±0.008	1.5011	0.1764
2-nitrobenzamide	1.45	1.091	1.094	NA	1.0925±0.002	0.2317	-0.6351
3-nitrobenzamide	1.95	1.159	1.158	NA	1.1585±0.001	0.3061	-0.5142
Nitrobenzene	2.35	2.426	2.429	NA	2.4275±0.002	1.7368	0.2397
4-Nitrobenzamide	1.93	1.161	1.159	NA	1.16±0.001	0.3078	-0.5118
1-naphtol	3.3	2.41	2.403	NA	2.4065±0.005	1.7131	0.2338
Direct Red 81	3.43	0.827	0.818	NA	0.8225±0.006	-0.0727	1.139
Benzoic acid methylester	1.8	2.585	2.61	NA	2.5975±0.018	0.1917	-0.7175
Carbendazim	2.35	1.193	1.193	NA	1.193±0.000	0.345	-0.4622
Benzoic acid phenylester	2.87	6.57	6.642	NA	6.606±0.051	6.4476	0.8094
Xylene	2.58	6.241	6.232	NA	6.2365±0.006	6.031	0.7804
Ethylbenzene	2.649	6.359	6.355	NA	6.357±0.003	6.1669	0.7901
Toluene	2.369	4.378	4.382	NA	4.38±0.003	3.938	0.5953
Naphthalene	2.75	6.127	6.218	NA	6.1725±0.064	5.9589	0.7752
1,2,3-trichlorobenzene	3.16	9.519	9.541	NA	9.53±0.016	9.7441	0.9887
Pentachlorophenol	3.695	8.282	8.259	NA	8.2705±0.016	8.3241	0.9203
3,5-dinitrobenzamide	2.31	1.308	1.311	NA	1.3095±0.002	0.4763	-0.3221
Benzamide	1.26	1.092	1.092	NA	1.092±0.000	0.2311	-0.6362
phenanthrene	4.09	11.996	11.779	NA	11.8875±0.153	12.4019	1.0935

Test substance Sodium naphthalene-1- sulphonate		K	LogK	Log Koc by Generalized Calibration Graph	Mean of Log Koc ± S.D.
tR1	0.811	-0.086	-1.067	1.206	1.255± 0.008
tR2	0.813	-1.079	-1.079	1.249

Validity criteria fulfilled:

yes

Conclusions:

The Adsorption Coefficient of test substance Sodium naphthalene-1-sulphonate (CAS No. 130-14-3)was determined as per the HPLC method (OECD Guideline-121). The Log Koc value was determined to be 1.255 ± 0.008 at 25°C.

Executive summary:

The adsorption coefficient Koc in soil and in sewage sludge of test chemical sodium naphthalene-1-sulfonate (CAS No. 130 -14 -3) 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 4 mg of test item and diluted with Acetonitrile up to 10 ml. Thus, the test solution concentration was 400 mg/l. The pH of test substance was 6.5. 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 reference substances were chosen according to functional similarity with the test substance and calibration graph prepared. The reference substances were 4-chloroaniline, 4-methylaniline(p-Tolouidine), N-methylaniline, p-toluamide, Aniline, 2,5 -Dichloroaniline, 4-nitrophenol, 2 - nitrophenol, 2-nitrobenzamide, 3 -nitrobenzamide, Nitrobenzene, 4 -Nitrobenzamide, Direct Red 81, Benzoic acid methylester, Carbendazim, Benzoic acid phenylester, Xylene, Ethylbenzene, Toluene, Naphthalene, 1,2,3-trichlorobenzene, Pentachlorophenol, Phenol, N,Ndimethylbenzamide, 3,5-dinitrobenzamide, N-methylbenzamide, Benzamide, phenanthrene, Acetanilide having Koc value ranging from 1.25 to 4.09. The Log Koc value of test chemical sodium naphthalene-1-sulfonate was determined to be 1.255 ± 0.008 at 25°C. This log Koc value indicates that the substance sodium naphthalene-1-sulfonate has a negligible sorption to soil and sediment and therefore have rapid migration potential to ground water.

Description of key information

The Adsorption Coefficient of test substance Sodium naphthalene-1-sulphonate (CAS No. 130-14-3) was determined as per the HPLC method (OECD Guideline-121). The Log Koc value was determined to be 1.255 ± 0.008 at 25°C.

This log Koc value indicates that the substance sodium naphthalene-1-sulfonate has a negligible sorption to soil and sediment and therefore have rapid migration potential to ground water.

Key value for chemical safety assessment

Koc at 20 °C:

18

Additional information

The adsorption coefficient Koc in soil and in sewage sludge of test chemical sodium naphthalene-1-sulfonate (CAS No. 130 -14 -3) 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 4 mg of test item and diluted with Acetonitrile up to 10 ml. Thus, the test solution concentration was 400 mg/l. The pH of test substance was 6.5. 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 reference substances were chosen according to functional similarity with the test substance and calibration graph prepared. The reference substances were 4-chloroaniline, 4-methylaniline(p-Tolouidine), N-methylaniline, p-toluamide, Aniline, 2,5 -Dichloroaniline, 4-nitrophenol, 2 - nitrophenol, 2-nitrobenzamide, 3 -nitrobenzamide, Nitrobenzene, 4 -Nitrobenzamide, Direct Red 81, Benzoic acid methylester, Carbendazim, Benzoic acid phenylester, Xylene, Ethylbenzene, Toluene, Naphthalene, 1,2,3-trichlorobenzene, Pentachlorophenol, Phenol, N,Ndimethylbenzamide, 3,5-dinitrobenzamide, N-methylbenzamide, Benzamide, phenanthrene, Acetanilide having Koc value ranging from 1.25 to 4.09. The Log Koc value of test chemical sodium naphthalene-1-sulfonate was determined to be 1.255 ± 0.008 at 25°C. This log Koc value indicates that the substance sodium naphthalene-1-sulfonate has a negligible sorption to soil and sediment and therefore have rapid migration potential to ground water.

[LogKoc: 1.255]