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EC number: 257-111-4 | CAS number: 51287-84-4
- 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
Hydrolysis
Administrative data
Link to relevant study record(s)
- Endpoint:
- hydrolysis
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- 16 October 2017 to 03 November 2017
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 111 (Hydrolysis as a Function of pH)
- Version / remarks:
- 2004
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.7 (Degradation: Abiotic Degradation: Hydrolysis as a Function of pH)
- Deviations:
- no
- GLP compliance:
- no
- Remarks:
- (this is not a toxicological or ecotoxicological test - GLP conditions not required)
- Radiolabelling:
- not specified
- Analytical monitoring:
- yes
- Details on sampling:
- Sample preparation: 370 µL/ 330 µL toluene-d8 (10 mg/mL CrAcAc)
- Buffers:
- pH 1.2: HCl 0.1 M
pH 4.0: HCl/NaCl/Citric acid
pH 7.0: Na2HPO4/NaH2PO4
pH 9.0: H3BO3/KCl/NaOH - Details on test conditions:
- TEST SYSTEM
- Type, material and volume of test flasks, other equipment used: 250 mL Erlenmeyer flask with ground in stopper
HIGH pH TESTING (pH 4.0, 7.0, 9.0)
- The test material was used without a co-solvent or a detergent.
- 1 g (1.8 mMol) of the test material was added to 100 mL of the respective buffer solution in a 250 mL Erlenmeyer flask.
- The flask was closed with a stopper and heated in a heating cabinet for 5 days (120 hours) at 50 °C.
- The mixture was stirred by a magnetic stirrer using a 40 x 7 mm stir bar at approx. 100 rpm.
- After the pre-determined reaction time, the solution was allowed to cool down to room temperature; 10 mL of each reaction mixture was taken by a syringe and placed in a headspace glass for TOC analysis. The rest of each reaction mixture was extracted with 20 mL hexane, the phases were separated using a separatory funnel. The organic phase was transferred into a pre-weighed flask and the solvent was removed in a rotary evaporator (< 40°C, 10 mbar). The weight difference was recorded for the mass balance, and the samples were analysed by 119Sn-NMR.
GASTRIC pH TESTING (pH 1.2/ 37 °C)
- The test material was used without a co-solvent or a detergent.
- 1 g (1.8 mMol) of the test material was added to 100 mL of 0.1 M aqueous solution of hydrochloric acid that was preheated to 37 °C in a 250 mL Erlenmeyer flask with ground in stopper.
- The flask was closed with a stopper and heated in a heating cabinet for 4 hours at 37 °C.
- The mixture was stirred by a magnetic stirrer using a 40 x 7 mm stir bar at approximately 100 rpm.
- After the pre-determined exposure time, the solution was allowed to cool down to room temperature; extracted 2 times with 25 mL hexane; the phases were separated using a separatory funnel. The organic phase was transferred into flask, and the solvent was removed in a rotary evaporator (< 40°C, 10 mbar). The sample was analysed by 119Sn-NMR. - Duration:
- 5 d
- pH:
- 4
- Temp.:
- 50 °C
- Initial conc. measured:
- 100 other: %
- Remarks:
- The test material was used without a solvent.
- Duration:
- 5 d
- pH:
- 7
- Temp.:
- 50 °C
- Initial conc. measured:
- 100 other: %
- Remarks:
- The test material was used without a solvent.
- Duration:
- 5 d
- pH:
- 9
- Temp.:
- 50 °C
- Initial conc. measured:
- 100 other: %
- Remarks:
- The test material was used without a solvent.
- Duration:
- 4 h
- pH:
- 1.2
- Temp.:
- 37 °C
- Initial conc. measured:
- 100 other: %
- Remarks:
- The test material was used without a solvent.
- Number of replicates:
- 1
- Positive controls:
- no
- Negative controls:
- no
- Transformation products:
- yes
- Remarks:
- Chloro dodecylthio dimethylstannane (DMT-SLau Cl)
- % Recovery:
- 85
- pH:
- 4
- Temp.:
- 50 °C
- Duration:
- 5 d
- % Recovery:
- 99
- pH:
- 7
- Temp.:
- 50 °C
- Duration:
- 5 d
- % Recovery:
- 99
- pH:
- 9
- Temp.:
- 50 °C
- Duration:
- 5 d
- Key result
- pH:
- 4
- Temp.:
- 50 °C
- DT50:
- > 1 yr
- Key result
- pH:
- 7
- Temp.:
- 50 °C
- DT50:
- > 1 yr
- Key result
- pH:
- 9
- Temp.:
- 50 °C
- DT50:
- > 1 yr
- Details on results:
- HYDROLYSIS AT pH 4,7 AND 9
- Samples of the test material were added to the respective buffer solutions at 50 °C for 5 days (120 h). None of the 119Sn-NMR spectra of the extracted reaction products, at any of the pH levels tested, showed signs of hydrolysis.
- The half-life time of the test material under the conditions of the study is > 1 year. The test material is considered as hydrolytically stable
HYDROLYSIS AT PH 1.2
- 1 g (1.8 mMol) of the test material was added to an excess 0.1 M hydrochloric acid at 37 °C for 4 hours and extracted with hexane after cooling down to room temperature. The 119Sn-NMR spectrum of the organic extract shows a decrease of the products peak and an increase of the breakdown product, the monochloride of the substance. A new peak at 158 ppm, a chemical shift area which is typical for disulphur bridged organotin compounds. However, the peak cannot be unequivocally assigned to a substance.
- The composition of the test material hydrolysate at pH 1.2 based on 119Sn-NMR analysis was:
DMT(-SLau)2 22 Mol%, DMT(-SLau)Cl 70 Mol% and 8 Mol% unknown.
MASS BALANCE RECIVERY RATES
pH 4: 83 %
pH 7: 98 %
pH 9: 99 %
pH 1.2: 79 %
ATOMIC ABSORPTION SPECTOMETRY
- The aqueous phases of the low pH hydrolysis has been analysed after extraction with hexane by AAS and contain 1720 mg/L Sn. - Validity criteria fulfilled:
- not specified
- Conclusions:
- Under the conditions of this study, the test material was is hydrolytically stable at pH 4, 7 and 9. At pH 1.2 the only identifiable breakdown product was the monochloride of the test material chlorododecylthio dimethylstannane (DMT-SLau Cl). It appears besides the unreacted test material with traces of a not further characterised substance. DMTC was not detected in the organic extract. The lower recovery of substance in the hexane extract and the content of 1720 mg/L tin remaining in the aqueous phase indicates that the dimethyltin cation remains in a soluble form in water.
- Executive summary:
The hydrolysis of the test material as a function of pH was investigated in accordance with the standardised guidelines OECD 111 and EU Method C.7.
The stability of the test material was investigated at pH 4, 7 and 9 and pH 1.2 using NMR spectroscopy.
The study shows that the test material is hydrolytically stable at pH 9, 7 and 4. After 5 days of hydrolysis at 50 °C less than 10 % of the test material was hydrolysed (half life at 25 °C > 1 year).
At simulated gastric conditions (0.1 M HCl /pH 1.2 /37 °C/ 4 h) the only identifiable breakdown product was the monochloride of the test material, chlorododecylthio dimethylstannane (DMT-SLau Cl). It appears besides the unreacted test material with traces of a not further characterised substance. DMTC was not detected in the organic extract.
The lower recovery of substance in the hexane extract and the content of 1720 mg/L tin remaining in the aqueous phase indicates that the dimethyltin cation remains in a soluble form in water.
Reference
Description of key information
Under the conditions of this study, the test material was is hydrolytically stable at pH 4, 7 and 9. At pH 1.2 the only identifiable breakdown product was the monochloride of the test material, chlorododecylthio dimethylstannane (DMT-SLau Cl). It appears besides the unreacted test material with traces of a not further characterised substance. DMTC was not detected in the organic extract. The lower recovery of substance in the hexane extract and the content of 1720 mg/L tin remaining in the aqueous phase indicates that the dimethyltin cation remains in a soluble form in water.
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 1 yr
- at the temperature of:
- 50 °C
Additional information
The hydrolysis of the test material as a function of pH was investigated in accordance with the standardised guidelines OECD 111 and EU Method C.7.
The stability of the test material was investigated at pH 4, 7 and 9 and pH 1.2 using NMR spectroscopy.
The study shows that the test material is hydrolytically stable at pH 9, 7 and 4. After 5 days of hydrolysis at 50 °C less than 10 % of the test material was hydrolysed (half life at 25 °C > 1 year).
At simulated gastric conditions (0.1 M HCl /pH 1.2 /37 °C/ 4 h) the only identifiable breakdown product was the monochloride of the test material, chlorododecylthio dimethylstannane (DMT-SLau Cl). It appears besides the unreacted test material with traces of a not further characterised substance. DMTC was not detected in the organic extract.
The lower recovery of substance in the hexane extract and the content of 1720 mg/L tin remaining in the aqueous phase indicates that the dimethyltin cation remains in a soluble form in water.
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