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EC number: 250-705-4 | CAS number: 31566-31-1
- 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
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
No toxicity up to the limit of water solubility (< 1 mg/L) is expected.
Key value for chemical safety assessment
Additional information
No data investigating the toxicity to microorganisms are available for Stearic acid, monoester with glycerol (CAS No. 31566 -31 -1). According to Regulation (EC) No. 1907/2006, Annex VIII, Column 2, 9.1.4, testing on aquatic microorganisms is not required if there are mitigating factors indicating that microbial toxicity is unlikely to occur, for example due to high insolubility of the substance in water. Stearic acid, monoester with glycerol is insoluble in water (water solubility < 1 mg/L) and therefore limited exposure to activated sludge microorganisms is expected for this substance.
The Guidance on information requirements and chemical safety assessment, Chapter R7.b (ECHA, 2012) states that once insoluble chemicals enter a standard STP, they will be extensively removed in the primary settling tank and fat trap and thus, only limited amounts will get in contact with activated sludge organisms. Furthermore Stearic acid, monoester with glycerol is readily biodegradable. According to the above mentioned guidance, for substances with a good biodegradation rate in a ready biodegradability test, inhibitory effects to aquatic microorganisms are not expected and the concentration tested can be used as a NOEC.
Additionally, a study conducted with Pseudomonas putida is available for the category member 1,2,3-propanetriyl trioleate (CAS No. 122-32-7). Therefore, in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 Grouping of substances, a read-across to this structurally related category member was conducted. Further justification is given within the endpoint summary 6.1 and within the category justification section 13. In this case of read-across, the best suited (highest degree of structural similarity, nearest physico-chemical properties) read-across substance within this category was used.
The test conducted on 1,2,3-propanetriyl trioleate was performed according to the German method “Assessment of hazardous substances in water, Determination of the acute toxicity in Bacteria”, under GLP conditions (Coenen, 1988). Pseudomonas putida cultures were exposed to the test substance for 18 hours in a static water regime at 25 °C and effects on cell proliferation were assessed (as the extinction of the monochromatic radiation at 436 nm in a 10 mm layer). After the exposure period, no inhibitory effects on cell multiplication could be observed up to the highest concentration tested and therefore, the EC50 (18 h) was determined to be > 0.8 mg/L (nominal concentration).
Based on the results of the test conducted with the structurally related category member (in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5), the ready biodegradability and poor solubility of Stearic acid, monoester with glycerol (CAS No. 31566 -31 -1) in water, this substance is not expected to show toxicity to aquatic microorganisms up to the limit of its water solubility.
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