Reaction products of C16-18 (even numbered), C18 unsaturated alkylamines with C10-13 alkylbenzenesulfonic acid

Biodegradation in water and sediment: simulation tests

Administrative data

Endpoint:

biodegradation in water: simulation testing on ultimate degradation in surface water

Data waiving:

study technically not feasible

Justification for data waiving:

the study does not need to be conducted because the substance is highly insoluble in water

Justification for type of information:

The water solubility for the registered substance is 64,3 µg/L at 20.0+0.5°C according a flask method test (OECD 105 and GLP).

Cross-reference

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

19 May 2017 - 16 July 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Version / remarks:

27 July 1995

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7840 (Water Solubility)

GLP compliance:

yes (incl. QA statement)

Type of method:

flask method

Key result

Water solubility:

< 0 g/L

Conc. based on:

test mat.

Remarks:

Sulphonate components

Temp.:

20 °C

pH:

> 7 - < 8

Water solubility:

< 0.001 g/L

Conc. based on:

test mat.

Remarks:

Amine components

Temp.:

20 °C

pH:

> 7 - < 8

Details on results:

The test item consists of a mixture of alkyl amines and sulfonate compounds. It was not possible to develop an analytical method to detect all of these components using a single analysis. Therefore the amines and sulfonates were analyzed separately by LC-MS using positive mode to detect the amines and negative mode to detect the sulfonates. As the exact composition and relative quantities of the different components in the test item were not known, each analysis was performed using the total weight of test item to calculate the concentration of the calibration standards. This means that for each analysis the calculated sample concentrations are an over estimate of the solubility of the components being analyzed, as the calculation does not account for the contribution to the standard concentration of the other set of components. For this reason the solubilities of the amine and sulfonate components have been reported as limit values of less than the analyzed results.

Amine Analysis

Solution	Mean Peak Area Ratio
Standard 0.209 mg/L^4	33.236
Standard 0.207 mg/L^5	35.584
Sample 1A	3.832
Sample 1B	3.728
Sample 2A	9.708
Sample 2B	8.859
Sample 3A	7.810
Sample 3B	7.461

⁴ Calibration Standard
⁵ Check Standard

 

Sulfonate Analysis

Solution	Mean Peak Area Ratio
Standard 10.9 mg/L^4	1.633
Standard 10.6 mg/L^5	1.531
Sample 1A	0.479
Sample 1B	0.484
Sample 2A	0.197
Sample 2B	0.168
Sample 3A	0.135
Sample 3B	0.141

The concentration (g/L) of test item in the sample solutions is shown in the following table:

Sample Number	Time Shaken at ~ 30 ºC (hours)	Amines Concentration (g/L)	Sulfonates Concentration (g/L)	Solution pH
1	24	4.75 x 10^-5	6.43 x 10^-5	7,6
2	48	1.17 x 10^-4	2.44 x 10^-5	7,4
3	72	9.60 x 10^-5	1.84 x 10^-5	7,1

 

Conclusions:

The water solubility for the test material is 10.6 x 10-4 g/L for the amine components and less than 6.43 x 10-5 g/L for the sulfonate components.

Executive summary:

An experimental study was carried out to determine the water solubility of the registered substance according the flask method (OECD 105) and GLP.

 

The water solubility for the test material is less than 10.6 x 10^-4 g/L for the amine components ans less than 6.43 10^-5 g/L for the sulfonate components of solution at 20.0 +0.5°C, designed to be compatible with Method A.6 Water Solubility of Commission Regulation No 440/2008, Method 105 of hte OECD Guidelines for Testing of Chemicals and Method 830.7840 of the OCSPP Guidelines.

Results and discussion

Transformation products:

not specified