Sodium ascorbate

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2009-12-09 to 2010-03-23

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

OECD harmonised ring method

Specific details on test material used for the study:

- Batch Number: TL00910581

Key result

Surface tension:

74 mN/m

Temp.:

20.3 °C

Conc.:

1.07 g/L

The calibration factor F_bwas determined to be 1.0222 for double distilled water (Table1). The data are part ofHarlan Laboratories' instruments files and a copy is presented in the raw data of thepresent study. Table 2 shows the individual measurements for the surface tension of the aqueous test item solution. From these, the mean and the corrected value for the given solution were calculated and shown in Table 2. The tabulated values represent rounded results obtained from calculation using the exact raw data.

Table 1: Determination of the Calibration Factor Using Water

Time expired	Temperature	Surface tension [mN/m]		Calibration factor
		measured	mean value calculated from the bold values
[hours:min]	[°C]		sg	Fb
00:31	20.1	71.3	71.17	1.0222
00:33	20.1	71.2
	20.0	71.1
00:37	20.0	71.2
00:39	20.0	71.1
00:41	20.0	71.1

 

 

with:

s_o     =      72.75 mN/m at 20.0 °C

F_b    =      s_o/s_g

F_b    =      72.75 / 71.17 = 1.0222

 

where:

 F_b    =      calibration factor

s_o     =      the surface tension of water at the test temperature

s_g     =      measured value of the surface tension of water at the test temperature

Table 2: Determination of Surface Tension for the Test Item Solution

Time expired	Temperature	Surface tension	[mN/m]
		measured	mean value calculated from the bold values	mean value corrected for calibration	s1corrected for Harkins-Jordan
[hours:min]	[°C]		(s *)	(s 1)	(s)
First sample
00:41	19.9	72.7	72.67	74.28	74.28
00:44	20.4	72.7
00:47	20.4	72.6
00:49	20.4	72.7
00:50	20.4	72.6
00:51	20.4	72.7
Second sample
00:45	20.4	72.1	72.13	73.74	73.74
00:46	20.4	72.1
00:47	20.3	72.2
00:48	20.2	72.1
00:49	20.2	72.2
00:51	20.2	72.1

 Mean value from both samples: s = 74.0 mN/m

 

Conclusions:

The surface tension of the test item in water (at a concentration of about 0.1%) was determined to be 74.0 mN/m at 20.3 °C ± 0.5 °C. Based on the criteria as outlined in the EEC Guideline and the results of this study,the test item has to be considered as a non surface active substance.

Executive summary:

The surface tension of the test item in water (at a concentration of about 0.1%) was determined to be 74.0 mN/m at 20.3 °C ± 0.5 °C. Based on the criteria as outlined in the EEC Guideline and the results of this study,the test item has to be considered as a non surface active substance.

 

Description of key information

The surface tension of the test item in water (at a concentration of about 0.1%) was determined to be 74.0 mN/m at 20.3 °C ± 0.5 °C. Based on the criteria as outlined in the EEC Guideline and the results of this study, the test item has to be considered as a non surface active substance.

Key value for chemical safety assessment

Surface tension:

74

in mN/m at 20°C and concentration in mg/L:

1 070

Additional information

The surface tension of the test item in water (at a concentration of about 0.1%) was determined to be 74.0 mN/m at 20.3 °C ± 0.5 °C. Based on the criteria as outlined in the EEC Guideline and the results of this study, the test item has to be considered as a non surface active substance.