Fatty acids, C18-unsatd., trimers, reaction products with triethylenetetramine

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

yes

Remarks:

measurement of turbidity

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.6 (Water Solubility)

Deviations:

yes

Remarks:

measurement of turbidity

GLP compliance:

yes (incl. QA statement)

Type of method:

other: modified flask method

Key result

Water solubility:

ca. 1 mg/L

Temp.:

20 °C

pH:

6.8 - 9.1

Remarks on result:

other: The test was performed at room temperature

Details on results:

The results from the two individual tests were 2.2 and 0.8 mg/L with a mean value of 1.5 mg/L (calculated from non-rounded values, see Table 1). Since the turbidimetric method generally shows more of a variation than other methods, it seems more realistic to report the solubility as "ca. 1 mg/L".
Higher pH values were measured at nominal test material concentrations above approx. 100 mg/L (pH 8-9). At lower concentrations pH values were in the range of 7-8.

Table 1: Turbidimetric determination of critical micelle concentration

 

Run 1

Sample	Concentration	Turbidity measurements (NTU)				pH	ln	ln
	(mg/L)	1	2	3	Mean		concentration	turbidity
1	422.7	46.3	46.3	46.2	46.3	9.2	6.047	3.834
2	211.3	24.3	24.2	24.1	24.2	8.7	5.353	3.186
3	105.7	11.4	11.4	11.6	11.5	7.6	4.661	2.439
4	52.83	5.12	5.10	5.17	5.13	7.1	3.967	1.635
5	26.42	8.88	8.70	8.56	8.71	6.9	3.274	2.165
6	13.21	1.27	1.28	1.29	1.28	6.9	2.581	0.247
7	6.604	0.79	0.72	0.84	0.78	6.8	1.888	-0.244
8	3.302	0.49	0.36	0.48	0.44	6.8	1.195	-0.813
9	1.651	0.20	0.31	0.19	0.23	6.8	0.501	-1.455
10	0.8255	0.45	0.45	0.54	0.48	7.2	-0.192	-0.734
11	0.4128	0.40	0.49	0.50	0.46	6.8	-0.885	-0.769
12	0.2064	0.54	0.43	0.53	0.50	7.0	-1.578	-0.693
13	0.1032	0.53	0.54	0.54	0.54	6.9	-2.271	-0.622
14	0.05159	0.54	0.57	0.57	0.56	7.1	-2.964	-0.580
15	0.01290	0.67	0.69	0.71	0.69	7.0	-4.351	-0.371

 

Linear regression of points 1 to 9:	Linear regression of points 9 to 15:
y(1) = 0.9597x - 1.9206	y(2) = 0.1690x - 1.0298
When y(1) = y(2), x = ln CMC
CMC = 2.2 mg/L

 

Run 2

Sample	Concentration	Turbidity measurements (NTU)				pH	ln	ln
	(mg/L)	1	2	3	Mean		concentration	turbidity
1	366.1	64.4	63.6	63.5	63.8	9.1	5.903	4.156
2	183.1	34.9	31.8	33.1	33.3	8.8	5.210	3.505
3	91.53	17.0	16.6	16.7	16.8	8.2	4.517	2.819
4	45.76	8.26	8.35	8.18	8.26	7.8	3.823	2.112
5	22.88	4.52	4.60	4.60	4.57	7.7	3.130	1.520
6	11.44	2.12	1.99	2.12	2.08	8.0	2.437	0.731
7	5.720	1.36	1.19	1.27	1.27	7.7	1.744	0.242
8	2.860	0.57	0.77	0.77	0.70	7.6	1.051	-0.352
9	1.430	0.59	0.59	0.58	0.59	7.9	0.358	-0.533
10	0.7150	0.33	0.46	0.26	0.35	8.0	-0.335	-1.050
11	0.3575	0.41	0.34	0.27	0.34	8.3	-1.029	-1.079
12	0.1788	0.18	0.47	0.18	0.28	8.0	-1.721	-1.285
13	0.08938	0.35	0.12	0.04	0.17	8.2	-2.415	-1.772
14	0.04469	0.25	0.39	0.39	0.34	7.9	-3.108	-1.069
15	0.02234	0.28	0.27	0.26	0.27	7.6	-3.801	-1.309
16	0.01117	0.25	0.43	0.14	0.27	8.0	-4.495	-1.297
17	0.005586	0.43	0.55	0.56	0.51	7.8	-5.187	-0.667

 

Linear regression of points 1 to 10:	Linear regression of points 10 to 17:
y(1) =0.8514x - 1.0551	y(2) =-0.0381x - 1.2962
When y(1) = y(2), x = ln CMC
CMC = 0.8 mg/L

 

Conclusions:

Interpretation of results (migrated information): slightly soluble (0.1-100 mg/L)

Description of key information

ca. 1 mg/L at 20 °C, pH 7-9 (OECD 105 and EU A.6)