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EC number: 272-574-2 | CAS number: 68890-66-4
- 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
Endpoint summary
Administrative data
Description of key information
BIOACCUMULATION IN WATER/SEDIMENT
Octopirox is a weak acid with a pKa of 5.9. This means the neutral form of Octopriox is deprotonated at high pH and is ionic. At pH4 most of the Octopirox exists in the neutral form whereas at pH 9 almost all Octopirox exists in the ionic form. Clariant has measured the n-Octanol solubility of Octopriox which is 37.5 g/L. The water solubility of Octopriox is pH dependant: pH4 22.1 mg/L, pH7 29.8 mg/L and pH9 473 mg/L. This results in a Log Coctanol/Cwater of 3.2 for pH4, 3.1 for pH7 and 1.9 for pH9. As expected the ionic form of Octopirox at pH 9 has the lowest partitioning coefficient. In order to confirm these estimates an OECD 107 Shake flask test was carried and the Log Kow was measured to be 3.86 at pH4 (neutral form: worst case). Based on the CLP Criteria for Bioaccumulation e.g. Log Kow >=4 or REACH PBT & vPvB B Screening criteria of Log Kow >4.5 these criteria for Octopirox are not fullfilled. The BCF and BAF for the neutral form of Octopirox can be estimated with the program US EPIWIN 4.2: BCF=131 L/kg and BAF=230 L/kg wet weight. These estimates support a low bioaccumulation potential of Octopirox. Therefore a Bioaccumulation study in water/sediment is not warranted. The statement given above fulfills the requirement for waiving as given in 1907/2006/EC Annex IX, Column 2, 9.3.2: The study need not be conducted if the substance has a low potential for bioaccumulation and /or a low potential to cross biological membranes.
BIOACCUMULATION IN SOIL
Octopirox is a weak acid with a pKa of 5.9. This means the neutral form of Octopriox is deprotonated at high pH forming an ionic form. At pH4 most of the Octopirox exists in the neutral form whereas at pH 9 almost all Octopirox exists in the ionic form. Clariant has measured the n-Octanol solubility of Octopriox which is 37.5 g/L. The water solubility of Octopriox is pH dependant: pH4 22.1 mg/L, pH7 29.8 mg/L and pH9 473 mg/L. This results in a Log Coctanol/Cwater of 3.2 for pH4, 3.1 for pH7 and 1.9 for pH9. As expected the ionic form of Octopirox at pH 9 has the lowest partitioning coefficient. In order to confirm these estimates an OECD 107 Shake flask test was carried and the Log Kow was measured to be 3.86 at pH4 (neutral form: worst case). No Bioaccumulation criteria for the soil compartment exist. But it is very likely that Octopirox has also in the terrestrial compartment a low bioaccumulation potential as in the aquatic compratment (see IUCLID Section 5.3.1). This is confirmed by the QSAR estimate for BCF worm of the neutral form of Octopirox calculated by EUSES Version 2.1 which is 96 L/kg ww.
Additional information
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