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EC number: 266-936-9 | CAS number: 67701-12-6 This substance is identified by SDA Substance Name: C14-C18 and C16-C18 unsaturated alkyl carboxylic acid zinc salt and SDA Reporting Number: 04-006-09.
- 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 aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Fatty acids, C14-18 and C16-18-unsatd., zinc salts:
Data are not available for the toxicity of Fatty acids, C14-18 and C16-18-unsatd., zinc salts to freshwater algae and cyanobacteria. Thus, read-across to structural analogue substances, i.e. zinc salts of fatty acids with equal or shorter alkyl chain length [Fatty acids, C16-18, zinc salts; zinc dilaurate (C12)] is applied.
In a growth inhibition test performed according to OECD TG 201, the alga Pseudokirchneriella subcapitata was exposed to dissolved fractions of the structural analogue fatty acids, C16-18, zinc salts at loadings of 0.01, 0.1, 1, 10 and 100 mg/L in standard test medium over a test period of 72 hours (Wenzel, 2013a), the calculated EL10 value for growth rate was 3.31 mg/L (extrapolated) whereas the EL50 is expected to be > 100 mg/L based on loadings of the applied dissolved fraction.
In addition, a growth inhibition test with P. subcapitata exposed to the dissolved fractions of zinc dilaurate at loadings of 0.01, 0.1, 1 and 10 mg/L in standard test medium over a test period of 72 hours revealed calculated EL50 values for growth rate of 12.87 mg/L (extrapolated) while the EL10 was 3.73 mg/L, based on loadings of the applied dissolved fraction (Wenzel, 2013b). In growth inhibition tests of the alga Desmodesmus subspicatus performed with the structural analogue zinc bis[12-hydroxyoctadecanoate] and the shorter-chained zinc dilaurate (C12), 72h-EC50 as well as the 72h-NOEC values far above the maximum water solubility were observed (Rudolph 2002 and Muckle 2009). In sum, zinc salts of fatty acids with a similar structural analogy, water solubility and zinc content are not toxic to algae at concentrations≤relevant acute and chronic aquatic classification criteria; and the potential of Fatty acids, C14-18 and C16-18-unsatd., zinc salts for toxicity to freshwater algae and cyanobacteria is considered similarly low.
Nevertheless, conservative read across to the assessment entities soluble zinc substances and C14-18 fatty acids is applied, since zinc cations and fatty acid anions determine the fate and toxicity in the environment. Since C14-18-satd. and C16-18-unsatd. fatty acids have a low potential for ecotoxicity, the hazard assessment of Fatty acids, C14-18 and C16-18-unsatd., zinc salt is based on zinc ions. Please refer to the endpoint summary of the respective assessment entity for further details.
Fatty acid anions (C14-18-satd. and C16-18-unsatd.):
Fatty acids as contained in plant and animal tissue are a natural component of aquatic systems, are rapidly degraded and non-bioaccumulative and have of low potential for toxicity to algae.
Zinc:
The lowest IC50 amounts to 0.136 mg Zn/L (single value) at neutral/high pH whereas the lowest NOEC is estimated with 0.019 mg Zn/L (geomean of 27 values) - all for Selenastrum capricornutum. Regarding marine algae, NOECs are available for 12 species ranging from 0.0078 to 0.67 mg/L (dissolved concentrations).
Key value for chemical safety assessment
Additional information
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