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EC number: 254-259-1 | CAS number: 39049-04-2
- 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
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Metal carboxylates are substances consisting of a metal cation and a carboxylic acid anion. Dissociation of dissolved neodecanoic acid, zirconium salts resulting in zirconium cations and neodecanoate anions may be assumed under environmental conditions. Thus, the transport and distribution of neodecanoic acid, zirconium salt in the environment is most accurately evaluated by separately assessing the fate of its constituents zirconium and neodecanoate.
Zirconium, however, has a very low mobility under most environmental conditions, mainly due to the stability of the mineral zircon (Zr(SiO4)) and the low solubility of the hydroxide Zr(OH)4. This limits the concentration of Zr in most natural water to <0.05 μg/L even in saltwater. Depending on the solution pH, Zr4+ and different zirconium hydroxides (i.e. Zr(OH)(3+), Zr(OH)2(2+), Zr(OH)3(+), Zr(OH)4) exist in solution. At pH 7, a Zr(OH)2(CO3)2(2-) complex can form, but this is unstable and decomposes with decreasing pH to form Zr(OH)4. The hydro-bicarbonate (Zr(OH)4-HCO3-H2O) complex may be the most significant Zr complex in natural water. Colloidal zirconium is also readily adsorbed by organic matter, macroplankton and siliceous material. Zirconium is considered to be only slightly mobile in soil with organic acids the main transporting agents for its transport and distribution (Salminen et al. 2005 and references therein).
Batch equilibrium experiments with solutions of soluble ZrOCl2 seem to indicate a very fast adsorption of zirconium to soil (1/k = ~ 3 min) and resulted in Kd values of 6,000 and 30,000 L/kg (dw) for an acidic and calcareous soil, respectively. The most important process appears to be adsorption to ferric oxides. However, very low soil/solution ratios favoring an adsorption were applied and resulting Kd values may be overestimated. Desorption experiments indicated very limited desorption, suggesting that non-reversible adsorption processes such as innersphere complexation or surface precipitation are involved. Considering the low solubility of zirconium in environmental solutions, a precipitation of zirconium hydroxides may also (at least in parts) explain the derived Kd values. Thus, zirconium is expected to be rather immobile in soils.
The estimated adsorption coefficient for neodecanoic acid is expected to be sensitive to pH. Neodecanoic acid is ionizable and has a pKa of 5.17 and is expected to dissociate to the ionised form at neutral pH, which is typical of most natural surface waters and therefore, remain largely in water. Estimated neo-decanoic acid log Koc is 2.5 using the measured log(Kow) value of 4.3 for the neutral species (at pH 2.5). The log Koc is 1.32 (Koc = 21) using the measured log(Kow) value at pH 6.7.
Key value for chemical safety assessment
Additional information
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