Disodium 4,5-dihydroxybenzene-1,3-disulphonate

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

10 Mar 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Landesamt für Umwelt, Wasserwirtschaft und Gewerbeaufsicht Kaiser-Friedrich-Straße 7, 55116 Mainz, Germany

Type of method:

plate method

Test material

Test material information

Constituent 1

Reference substance name:

Disodium 4,5-dihydroxybenzene-1,3-disulphonate

EC Number:

205-741-5

EC Name:

Disodium 4,5-dihydroxybenzene-1,3-disulphonate

Cas Number:

149-45-1

Molecular formula:

C6H6O8S2.2Na

IUPAC Name:

disodium 4,5-dihydroxybenzene-1,3-disulphonate

Results and discussion

Surface tension

Key result

Surface tension:

72.83 mN/m

Temp.:

19.5 °C

Conc.:

1 g/L

Any other information on results incl. tables

Results of Reference Test

Water, HPLC grade, Lot BCBS5352V_5 was measured. The following values were recorded:

Measurement	Time	Mass	SurfaceTension	Temperature
No	s	g	mN/m	°C
1	3.0	0.3004	73.28	19.0
2	5.9	0.3002	73.23	19.0
3	8.9	0.3003	73.26	19.0
4	11.9	0.2999	73.16	19.0
5	14.9	0.3001	73.21	19.0
6	17.9	0.2997	73.11	19.0
7	21.0	0.3001	73.21	19.0
8	23.9	0.2998	73.14	19.0
9	27.0	0.3000	73.18	19.0
10	29.9	0.3001	73.21	19.0
Mean			73.20
Standard Deviation			0.05

Results of Main Test

The test item solution was held at constant temperature (20.0 ± 0.5 °C). 60 minutes after conclusion of the first measurement series, a second measurement series was performed for verification purposes.

The following values were recorded:

 

First Measured Series

Measurement	Time	Mass	SurfaceTension	Temperature
No	s	g	mN/m	°C
1	2.9	0.2988	72.89	19.5
2	5.9	0.2984	72.79	19.5
3	8.9	0.2988	72.89	19.5
4	11.9	0.2985	72.82	19.5
5	14.9	0.2985	72.82	19.5
6	17.9	0.2984	72.79	19.5
7	20.9	0.2986	72.84	19.5
8	23.9	0.2983	72.77	19.5
9	26.9	0.2984	72.79	19.5
10	29.9	0.2986	72.84	19.5
Mean			72.83
Standard Deviation			0.04

 

Second Measured Series

Measurement	Time	Mass	SurfaceTension	Temperature
No	s	g	mN/m	°C
1	2.9	0.2980	72.70	19.9
2	5.8	0.2979	72.67	19.9
3	8.9	0.2984	72.79	19.9
4	11.8	0.2977	72.62	19.9
5	14.9	0.2977	72.62	19.9
6	17.8	0.2982	72.74	19.9
7	20.9	0.2981	72.72	19.9
8	23.8	0.2980	72.70	19.9
9	26.9	0.2978	72.65	19.9
10	29.9	0.2978	72.65	19.9
Mean			72.69
Standard Deviation			0.06

After the first and the second measurement series, the difference between mean values was less than 5%. Therefore no additional measurement series was required.

Result of Test Item

During the specified period of time, no significant changes in the surface tension were detected. Values ranging from 72.62 mN/m to 72.89 mN/m were recorded showing no significant variations. The values of the single determinations show no significant difference (less than 5 % between mean values of the two measurement series). As the determined surface tension of AF-378 was higher than 60 mN/m, the test item can be classified as not surface active.

 

Validity of Results

Literature value for the surface tension of water at 19.0 °C: 72.90 mN/m (taken from Vargaftik et al., “International Tables of the Surface Tension of Water”, J. Phys. Chem. Ref. Data 12, 817, 1983).

The surface tension of the negative control was determined with 73.20 at 19.0 °C, there- fore showing a difference of 0.41% from the stated literature value. The difference lies within the accepted range of 1% deviation from literature value.

 

Discussion of Results

The values of the single determinations show no significant difference (0.19% between mean values of the two measurement series). All measured values lay clearly above the threshold for surface tension which is stated in the guidelines. The surface tension of the negative control was determined with a difference of 0.41 % from the stated literature value. Therefore, the result of the test is considered valid and the test item AF-378 is classified as “not surface active” in a concentration of 1.00 g/L.