Registration Dossier
Registration Dossier
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EC number: 701-164-2 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
Environmental fate and pathways summary
Stability
Volatility & Phototransformation in air
A low vapor pressure (0.000096 Pa at 25°C, OECD 104) indicating significant amounts of Reaction products of C16-18 (even numbered), C18 unsaturated alkylamines with C10-13 alkylbenzenesulfonic acid (EC 701-164-2) are unlikely to be present in the atmosphere for photodegradation.
Hydrolysis
This study does not need to be conducted because the substance (uvcb) is highly insoluble in water (the water solubility for the test material is less than 10.6 x 10 -4 g/L for the amine components and less than 6.43 10 -5 g/L for the sulfonate components of solution at 20.0 +0.5°C, Method OECD 105).
Biodegradation in water : screening tests
An experimental study was carried out to determine the ready biodegradation property of the registered substance according the CO2 Evolution Test (OECD 301B) and GLP. The test material attained 31% biodegradation after 28 days and 32% biodegradation after 35 days and therefore cannot be considered to be readily biodegradable under the strict terms and conditions of OECD Guideline No. 301B.
Bioaccumulation
The registered substance is a reaction products of C16-18 (even numbered), C18 unsaturated alkylamines with C10-13 alkylbenzenesulfonic acid (EC 701-164-2). The reaction mass is constited by both part (alkylamine and alkylbenzene sulfonic acid) are generally present with a 1:1 ratio.
Regarding the Primary Alkylamine part of the reaction mass, the most suitable approach to derive a BCF is the ADME Model of Arnot and Gobas (2003) for the unprotonated C16 amine. C16 amine is a model compound for the Primary alkyl amines. Therefore it is proposed to use for the Primary alkyl amines a BCF of 173 L/kg as estimated by the ADME Model of Arnot & Gobas (2003) on basis of a Weight of Evidence.
Regarding the C10-13 alkylbenzenesulfonic acid part, the linear alkylbenzene sulfonate compound (C13) has been considered to predict the BCF and constitute a worst-case approach. QSAR estimation using the BCFBAF v3.01 of the EPISUITE 4.1 indicate that the BCF in fish of the C13 linear alkylbenzene sulfonate acid is 70.8 L/kg ww. The (Q)SAR is valid and was applied to a chemical falling within its applicability domain.
This predicted value on the C13 Alkylbenzenesulphonate was supported by experimental studies available on similar substance:
- Freitag D, 1982 (publication similar to OECD 305, BCF = 130 L/kg, 3 days, Na n-Dodecylbenzene sulfonate (N salt), Leuciscus idus melanotus)
- Versteeg, 2003 (publication similar to OECD 305, BCF = 36 to 119 L/kg, 32 days, C12-LAS mixed isomer (97% of C12) Pimephales promelas & Ictalurus punctatus)
Considering a worst case approach, the predicted value for alkylamines constituents remains the highest predicted BCF value. Therefore the BCF = 173 L/kg was used for regulatory purpose to define the bioaccumulation potential of the registered reaction mass (EC 701-164-2).
Adsorption
An experimental study was carried out to determine the adsorption coefficient (Koc) of the registered substance according the HPLC Method (OECD 121) and GLP. The substance is an UVCB, therefore the Koc values are estimated for each main representative constituant. The Koc is greater than > 4.27 x 105 (log Koc > 5.63) for both amine and sulfonate components, this result indicates a strong adsorption behaviour.
Biodegradation in soil
No simulation test in soil are available on the registered reaction mass (EC 701-164-2). However, such data in soil are available and can be considered in a Weight of Evidence because they have been conducted on the representative constituent of both type of chemicals with constituted the reaction mass. Regarding the alkylamine constituants (C16-C18 and C18-unsatd) an OECD 307 aerobic soil transformation study (3 soils) was carried out with [1-14C]-Hexadecanamine (Harlan, 2010). In this study, half-lives between 8.1 and 9 days at 20 degree C were determined. Regarding the C10-13 alkylbenzenesulfonic acid, a DT50 for C12-LAS is 23.1 days at 20°C estimated by Ward and Larson (1989) publication.
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