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EC number: 201-177-9 | CAS number: 79-10-7
- 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
The inhibition of the degradation activity of activated sludge is not anticipated when acrylic acid is introduced into biological treatment plants in appropriately low concentrations.
EC20 (30 min) = 900 mg/L (domestic activated sludge, ISO 8192)
NOEC (30 min) = 100 mg/L (domestic activated sludge, ISO 8192)
TTC = 0.9 mg/L (Chilomonas paramaecium, cell multiplication inhibition test)
Key value for chemical safety assessment
- EC10 or NOEC for microorganisms:
- 100 mg/L
Additional information
In a test with domestic activated sludge the inhibition of oxygen consumption was examined according to guideline ISO 8192 (BASF AG, 1993). After 30 minutes oxygen uptake was inhibited by 16 % at 500 mg/L and by 21 % at 1000 mg/L, the highest concentration tested. Thus, the EC20 was determined to be 900 mg/L. The NOEC was determined to be 100 mg/L.
In addition, there are several publications concerning acute toxicity of acrylic acid towards microorganisms. Radix et al. (1999, 2000) reported a NOEC for Vibrio fisheri of 6.25 mg/L (nominal) determined in the Microtox Chronic Toxicity Test (bioluminescence). Seward & Schultz (1999) found the IC50 for Tetrahymena pyriformis in the Tetratox assay to be 49.85 mg/L for acrylic acid.
But the most sensitive microorganism to acrylic acid was the protozoan Chilomonas paramaecium with a 48-hour Toxicity Threshold of 0.9 mg/L determined in a cell multiplication inhibition test (Bringmann, 1980). Although this species does not influence the degradation processes in a wastewater treatment plant itself, it is necessary for a proper function of a WWTP and therefore, was used for derivation of the PNEC STP in the EU Risk Assessment (2002).
Taking all these test results into consideration, inhibition of the degradation activity of activated sludge in a WWTP is not anticipated when the substance is introduced in appropriately low concentrations in WWTPs.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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