Phosphoric acid, C8-16-alkyl esters, reaction products with (Z)-N-9-octadecenyl-1,3-propanediamine

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 03 to 06 April 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Qualifier:

according to guideline

Guideline:

other: - ISO 304 – Surface Active Agents – Determination of surface tension by drawing up liquid films.

Version / remarks:

December 15, 1985

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: 80555E094
- Expiration date of the lot/batch: 05 December 2018
- Manufacturing test date: 05 December 2017

Surface tension:

40.4 mN/m

Temp.:

20.2 °C

Remarks on result:

other: +/- 0.2 °C

Surface tension:

40.2 mN/m

Temp.:

20.2 °C

Remarks on result:

other: +/- 0.2 °C

Surface tension:

40.3 mN/m

Temp.:

20.2 °C

Remarks on result:

other: +/- 0.2 °C .

Remarks:

Surface tension mean. determined from five consecutive measurements with a deviation < 0.1 mN/m from the mean.

Calibration and reference substances

The surface tension of the reference substance methanol was measured before the first determination. A surface tension of 22.7 mN/m was registered and complies with the validation criteria of 22.5 +/- 0.2 mN/m.

The surface tension of the reference substance butanol-1 was measured after the second determination. A surface tension of 24.3 mN/m was registered and complies with the validation criteria of 24.3 +/- 0.2 mN/m.

First determination

The temperature was 20.2°C at the beginning of the determination and 20.3°C at the end of the determination.The temperature during the determination did not vary by more than 0.5°C.

The time elapsed between the preparation of the solution and its transfer to the beaker is 3 minutes and 21 seconds.

The following surface tension values were obtained:

Time (Min:Sec)	0:00	0:42	01:23	02:12	02:59	03:47	04:37	05:14
Surface Tension (mN/m)	/	54.5	49.4	48.8	48.4	46.8	46.3	46
Time (Min:Sec)	05:52	06:36	07:29	08:35	09:17	09:56	10:46	11:27
Surface Tension (mN/m)	45	45	44.5	44.4	43.6	43.5	43.2	43.3
Time (Min:Sec)	12:51	13:27	14:10	15:02	15:42	16:21	16:55	17:34
Surface Tension (mN/m)	42.6	42.6	42.3	42.6	42.1	42.0	41.9	41.8
Time (Min:Sec)	18:20	19:32	20:06	20:19	21:24	22:00	22:38	23:58
Surface Tension (mN/m)	42	41.4	41.4	41.1	41.1	41.2	41.0	40.6
Time (Min:Sec)	24:38	25:19	26:01	26:42	27:29	28:08	28:54	29:34
Surface Tension (mN/m)	40.7	40.6	4.5	40.5	40.4	40.4	40.4	40.4

The five last values do not differ by more than 0.1 mN/m from the mean, so they were used for the calculation of the mean.

By calculating the average of the five last values, the mean value obtained is 40.4 mN/m.

 Second determination

The temperature was 20.3°C at the beginning of the determination and 20.4°C at the end of the determination. The temperature during the determination did not vary by more than 0.5°C.

The time elapsed between the preparation of the solution and its transfer to the beaker is 3 minutes and 43 seconds.

The following surface tension values were obtained:

Time (Min:Sec)	0:00	0:22	01:00	01:33	02:05	03:43	04:56	05:28
Surface Tension (mN/m)	/	43.1	42.7	42.3	42.0	42.8	42.0	41.6
Time (Min:Sec)	06:01	06:34	07:05	07:37	08:08	09:04	10:14	10:45
Surface Tension (mN/m)	41.1	40.9	40.8	40.7	40.5	40.3	39.7	39.5
Time (Min:Sec)	13:52	14:19	14:56	15:26	16:11	16:47	18:06	19:17
Surface Tension (mN/m)	41.2	41.1	40.6	40.5	40.1	40.2	39.5	40.4
Time (Min:Sec)	20:04	20:55	21:24	21:56	22:30	23:12	24:19	25:58
Surface Tension (mN/m)	40.2	39.4	39.4	39.9	39.6	40.1	40.2	40.1
Time (Min:Sec)	26:23	26:52
Surface Tension (mN/m)	40.2	40.2

The five last values differ by more than 0.1 mN/m from the mean, so they were not used.

Conclusions:

The surface tension of test item was determined using a Du Noüy ring and following the OECD Guideline 115, "Surface Tension of Aqueous Solutions" (1995). The procedure is considered to be compatible with the ISO 304 (1985) – Surface Active Agents – Determination of surface tension by drawing up liquid films.
The water solubility is unknown, three solutions of 500 ml were prepared at a loading rate of 1 g/L in distilled water.
Their surface tension was then determined from five consecutive measurements with a deviation < 0.1 mN/m from the mean.

The surface tension of test item was determined to be 40.3 mN/m.

Executive summary:

Results of the two determinations do not differ by more than 0.5 mN/m, so the mean value of 40.3 mN/m is retained for final result.

Determination	Surface tension (mN/m)
1	40.4
2	40.2
Mean	40.3

Description of key information

The surface tension of test item was determined using a Du Noüy ring and following the OECD Guideline 115, "Surface Tension of Aqueous Solutions" (1995). The procedure is considered to be compatible with the ISO 304 (1985) – Surface Active Agents – Determination of surface tension by drawing up liquid films.

The water solubility is unknown, three solutions of 500 ml were prepared at a loading rate of 1 g/L in distilled water.

Their surface tension was then determined from five consecutive measurements with a deviation < 0.1 mN/m from the mean.

The surface tension of test item was determined to be 40.3 mN/m.

Key value for chemical safety assessment

Surface tension:

40.3

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

1 000