Nonanedioic acid, 1,9-bis(2-octyldodecyl) ester

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

8 May - 6 Oct 2007

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

GLP compliance:

yes (incl. QA statement)

Type of method:

flask method

Water solubility:

< 4 µg/L

Temp.:

20 °C

pH:

5.9

Remarks on result:

other: 4 µg/L was LOQ (limit of quantification).

Details on results:

Temperature accuracy ± 0.5 °C; pH accuracy ± 0.3.

Water solubility results at 20 °C (mean values of two replicates and two injections):

Sample No.	Sampling date 2007	Sampling time	Test item solubility  [mg/L]
1	17 Sep	10.35 am	4.01*
2	17 Sep	3.45 pm	< LOQ
3	18 Sep	9.30 am	4.10*
4	18 Sep	2.55 pm	12.5
5	19 Sep	9.10 am	9.87*
6	19 Sep	4.30 pm	16.7
7	20 Sep	10.30 am	58.0
8	20 Sep	4.00 pm	11.5*
11	24 Sep	10.10 am	< LOQ
12	24 Sep	4.10 pm	< LOQ
13	25 Sep	8.20 am	4.79*
14	25 Sep	1.30 pm	< LOQ
15	26 Sep	8.30 am	< LOQ
16	26 Sep	2.05 pm	< LOQ
20	1 Oct	10.45 am	< LOQ
21	1 Oct	3.45 pm	< LOQ
22	2 Oct	9.30 am	< LOQ
23	2 Oct	3.45 pm	< LOQ
24	4 Oct	10.00 am	< LOQ
25	4 Oct	3.50 pm	< LOQ
26	5 Oct	8.45 am	< LOQ

* - concentration of only one replicate > LOQ (LOQ = 4 µg/L).

Repeatability of injections of the standard

Peak area [Count*s]:

Serial No.	Test item
	1.2 µg/L	100 µg/L
1	1704	155698
2	1895	156707
3	1775	155061
4	1641	155313
5	1631	153576
6	1638	151758
Mean ± SD	1714 ± 105	154685 ± 1758
CV[%]	6.1	1.1

SD- standard deviation; CV - coefficient of variation

Recovery rates of fortified test item samples. Fortified concentrations: 4 µg/L (LOQ) and 40 µg/L (10xLOQ):

	Test item
	1xLOQ		10xLOQ
	Measured conc. [µg/L]	RR[%]	Measured conc. [µg/L]	RR[%]
Replicate 1	3.77	94	31.7	79
Replicate 2	3.95	99	33.2	83
Replicate 3	3.56	89	32.4	81
Replicate 4	3.96	99	27.8	70
Replicate 5	3.36	84	34.7	87
Mean	3.72	93	32.0	80
SD	0.259		2.58
CV[%]	6.96		8.06

RR-recovery rate related to the fortified concentration; SD- standard deviation; CV - coefficient of variation

Response of blank values of control samples was lower than 30% of LOQ.

Check of the temperature:

Intended temperature [°C]	Replicate	Measured temperature [°C]
		min	max	Mean ± SD
20± 0.5	1	19.93	20.20	20.06 ± 0.05
	2	19.76	20.00	19.88 ± 0.05

SD-standard deviation

Check of the pH value:

Replicate	Measured pH-value
	min	max	Mean ± SD	Total Mean ± SD
1	5.24	6.45	5.94 ± 0.30	5.90 ± 0.30
2	5.50	6.65	5.86 ± 0.30

The Tyndall-Effect was negative for all samples.

The validity criteria were fulfilled: the concentration measured in at least the last two test vessels did not differ for more than 15%,

the temperatures were kept constant within ± 0.5 °C.

Description of key information

< 4 µg/L at 20 °C and pH = 5.9

Additional information

There was an attempt performed, to determine the water solubility of the substance nonanedioic acid, bis(2 -octyldodecyl) ester (CAS 897626 -46 -9) according to the OECD Guideline 105 and the EC Guideline A.6. The water solubility measured was below the LOQ (limit of quantification) of 4 µg/L. Thus, the substance is insoluble in water.