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EC number: 824-801-7 | CAS number: 1093628-27-3
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
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- Flash point
- Auto flammability
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- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
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- Endpoint summary
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- Ecotoxicological Summary
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- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
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- Endocrine disrupter testing in aquatic vertebrates – in vivo
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Endpoint summary
Administrative data
Description of key information
Discussion of the Results for C10-C13 alkylbenzene sulfonic acid
The experiments for adsorption and desorption kinetics showed that the adsorption of the alkylbenzene sulfonic acids to the soil particles takes place slowly. The adsorption equilibrium was not reached for each analysed compound using a soil / solution ratio of 1:30. As recommended by the guideline, evaluation of phenomena which lead to the steady decrease of the test item concentration in the aqueous phase was conducted. As the results of the test item control samples measured during Tier 2 neither indicated depletion of the test item in the aqueous phase by adsorption processes on test vessels nor by degradation processes, the test item was considered to be stable in the test system over 48 h. The impact of soil parameters on the adsorption / desorption behavior of a chemical substance was considered by the selection of soils which differ significantly in their composition and physical properties. The soil type apparently does not affect the achievement of the adsorption equilibrium and the ionisation of the alkylbenzene sulfonates is not affected by the pH value in the study range from 5.0 to 7.5. To investigate the agitation time which is necessary to reach the adsorption equilibrium and to verify if an agitation time longer than 48 h (as recommended by the guideline) is applicable for the anionic compound, additional experiments have been conducted over a period of 168 h. The soil / solution ratio of 1:30 was used, as measured concentrations below the LOQ should be avoided. The results are summarized in Table 31 (detailed analytical data are not reported). Whereas the adsorption increased over time, the recovery rate for test item control samples decreased for the aqueous phase. At the same time, increasing test vessel adsorption was determined. The adsorption increased until the concentration in the aqueous phase was below the LOQ of the analytical method without showing an adsorption equilibrium in 168 h. Thus, longer agitation times than recommended by the guideline do not result in a definitive adsorption equilibrium and are therefore not applicable for this test item. A higher soil / solution of 1:5 was used to obtain the adsorption equilibrium faster and these experiments were used for evaluation of the adsorption in suspensions of some soils.
With regard to the results obtained during the experiments over 168 h, a higher soil / solution ratio of 1:5 was chosen to accelerate the adsorption process. Inappropriately, high soil / solution ratios also enhance the test item depletion in the aqueous phase with the disadvantage that the certainty in the determination of the remaining test item concentration decreases. Measured concentrations were partly below the LOQ of the analytical method. It is considered that the steady decrease of the test item in the aqueous phase is related to its chemical composition and the presence of the diamine which can work as a bridge between negative charges. To provide plausible values for Kd and KOC, data have been calculated for the best suitable soil / solution ratio (1:5 or 1:30) for each analyte regarding the degree of adsorption on the one hand and the measured concentrations on the other hand.
Summarized Endpoints - C10-C13 alkylbenzene sulfonic acid
Soil Type | Soil / solution ratio | Kd [mL/g] | KOC [mL/g] | Kdes [mL/g] | Mobility according to McCall et al. |
C10-alkylbenzene sulfonic acid | |||||
LUFA 2.2 | 1:5 | 65 | 4407 | 211 | slight |
LUFA 2.3 | 1:5 | 6 | 1462 | 33 | low |
LUFA 2.4 | 1:30 | 179 | 10278 | 194 | immobile |
C11-alkylbenzene sulfonic acid | |||||
LUFA 2.2 | 1:5 | 175 | 11915 | 187 | immobile |
LUFA 2.3 | 1:5 | 13 | 3138 | 51 | slight |
LUFA 2.4 | 1:30 | 85 | 4862 | 984 | slight |
C12-alkylbenzene sulfonic acid | |||||
LUFA 2.2 | 1:30 | 93 | 6298 | 939 | immobile |
LUFA 2.3 | 1:5 | 27 | 6627 | 79 | immobile |
LUFA 2.4 | 1:30 | 193 | 11087 | 1034 | immobile |
Summarized Endpoints - N,N-dimethyl-1,3-propanediamine
Soil Type | Soil / solution ratio | t (eq) [h] |
Kd [mL/g] | KOC [mL/g] | Kdes [mL/g] | Mobility according to McCall et al. |
C10-alkylbenzene sulfonic acid | ||||||
LUFA 2.2 | 1:100 | 6 | 143 | 9695 | 326 | immobile |
LUFA 2.3 | 1:100 | 24 | 205 | 49859 | 443 | immobile |
LUFA 2.4 | 1:100 | 24 | 515 | 29590 | 889 | immobile |
Additional information
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