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EC number: 227-579-4 | CAS number: 5895-46-5
- 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
The overall Kd range was 1.38 x 10³ to at least 6.10 x 10³, the overall Koc range was 1.33 x 10⁴ to at least 2.39 x 10⁵ and the overall log10 Koc range was 4.12 to at least 5.38 at 25 ± 2 °C.
Key value for chemical safety assessment
Additional information
The adsorption characteristics of the test material were determined using a batch equilibrium method in accordance with the standardised guidelines OECD 106 and EU Method C.18 under GLP conditions.
The distribution coefficient (Kd) and the organic carbon normalised adsorption coefficient (Koc) for the neodymium content of the test material were determined for five soil types at 25 ± 2 °C. The soils were: soil type 2, loam (pH 7.3); soil type 3, silt loam (pH 6.2); soil type 4, silt loam (pH 5.1); soil type 5, loamy sand (pH 5.8); and soil type 7, loamy sand (pH 3).
Due to limited aqueous solubility of the test material and the irrelevance of organic co-solvents to inorganic test materials, stock solutions were prepared by shaking saturated solutions of test material in 0.01 M calcium chloride solution overnight, at ambient laboratory temperature.
With the exception of the acidic soil type 7, definitive results were calculated from the initial sampling time-point, employing an adsorption equilibration period of 2 hours, due to an inherent instability of the dissolved neodymium content of the soil-less control solutions as a function of time. For the soil type 7, potentially due to the acidic nature of the soil/solution mixture promoting aqueous solubility, equilibrium was not evident at 2 hours. However consistent replicates were obtained following 5 hours equilibration and therefore this data were used for calculation of the distribution coefficient (Kd) and the organic carbon normalised adsorption coefficient (Koc) values.
The adsorption properties (as distribution coefficients) observed for the dissolved neodymium content of the sample solutions showed no significant correlation to the organic carbon content of the soils evaluated.
From the soil type 7 results obtained, pH was evidently a very significant soil/solution criterion for the behaviour of this inorganic ion in soil. Even though soil type 7 presented both the highest organic carbon content and cation exchange capacity of the five soils investigated (22.7 % and 49.8 meq/100 g, respectively), the resultant distribution coefficient (Kd) value was the second lowest of the five soils investigated. Such a result was inversely proportional to the expectations of the methodology, predominantly aimed at organic compounds, as the acidic nature of this soil promoted aqueous solubility of the metal cation and therefore reduced the proportion partitioning on to the soil phase. Only soil type 5 resulted in a lower distribution coefficient (Kd) value. Soil type 5 presented both the lowest organic carbon content and cation exchange capacity of the five soils investigated (1.01 % and 9.2 meq/100 g, respectively). Therefore on comparison of soil type 5 and soil type 7, it can be observed that both the influence of an approximately 20 fold increase in organic carbon content and an approximately 5 fold in cation exchange capacity were negated by the decrease in the aqueous phase solution pH.
Under the conditions of this study, the overall Kd range was 1.38 x 10³ to at least 6.10 x 10³, the overall Koc range was 1.33 x 10⁴to at least 2.39 x 10⁵and the overall log10 Koc range was 4.12 to at least 5.38 at 25 ± 2 °C.
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