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Diss Factsheets
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EC number: 203-509-8 | CAS number: 107-66-4
- 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
Additional information
Stability (Hydrolysis)
Hydrolysis of dibutyl hydrogen phosphate was investigated at pH 4, 7 and 9, and a temperature of 50°C. The test was performed according to OECD Guideline 111 (Hydrolysis as a Function of pH). After 5 days the recoveries of dibutyl hydrogen phosphate were in the range of 97.5 % to 104.4%. Therefore, dibutyl hydrogen phosphate is regarded as hydrolytically stable, and no degradation due to hydrolysis is expected under environmental conditions.
Biodegradation (screening tests)
According to EU method C.4-E (Determination of the "Ready" Biodegradability - Closed Bottle Test) a degradation of 12 % after 28 days was observed. In conclusion dibutyl hydrogen phosphate is not readily biodegradable.
The inherent biodegradability of dibutyl hydrogen phosphate was determined according to the EU Method C.9 (Biodegradation: Zahn-Wellens Test).
Within 28 days a degradation of > 98 % was determined. Therefore dibutyl hydrogen phosphate is considered as inherently biodegradable.
Biodegradation (water/sediment, soil)
Dibutyl hydrogen phosphate is considered as not readily biodegradable, but inherently biodegradable. The performance of simulation tests covering the aquatic, sediment and soil compartment is scientifically not necessary as it would not provide additional information for the hazard, risk and persistency assessment.
Bioaccumulation
Following the OECD Guideline 305C with Cyprinus carpio as test organism the obtained BCF values were in the range of <0.7 - <7. Determinations were conducted at concentrations of 0.2 and 2 mg/L. The received BCF values indicate that dibutyl hydrogen phosphate is not bioaccumulative. These results are in accordance with the calculated log Kow of -0.90 for the dissociated form of dibutyl hydrogen phosphate.
Adsorption/desorption
Based upon its pKa, dibutyl hydrogen phosphate exits predominantly in its dissociated form under relevant environmental pH 5 - 9.
Following the OECD Guideline 121 (HPLC method) a log Koc value of 0.5 was received for the dissociated form of dibutyl hydrogen phosphate. This value indicates that dibutyl hydrogen phosphate has a negligible sorption potential to soil and sediment. QSAR determinations revealed log Koc values of 0.53 for the dissociated form and 2.3 for the non-dissociated form. Both values also indicate a low potential for adsorption.
Henry's Law Constant
The QSAR determination of the Henry's Law Constant for dibutyl hydrogen phosphate using the Estimation Program Interface (EPI) Suite v4.11 revealed a value of 0.000432 Pa*m³/mol at 25°C. This value indicates that dibutyl hydrogen phosphate is essentially non-volatile from water, and a long-range transport via the atmosphere is not expected.
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