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EC number: 613-953-8 | CAS number: 66603-10-9
- 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
Biodegradation in water and sediment: simulation tests
Administrative data
- Endpoint:
- biodegradation in water: sewage treatment simulation testing
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study with acceptable restrictions
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 980
- Report date:
- 1980
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- other: OECD-Confirmatory test
- Version / remarks:
- OECD-Environment directorate proposed method for the determination of the biodegradability of surfactants used in synthetic detergents (Paris 1976)
- Deviations:
- not specified
- GLP compliance:
- no
Test material
- Reference substance name:
- Cyclohexylhydroxydiazene 1-oxide, potassium salt
- EC Number:
- 613-953-8
- Cas Number:
- 66603-10-9
- Molecular formula:
- C6H11KN2O2
- IUPAC Name:
- Cyclohexylhydroxydiazene 1-oxide, potassium salt
- Test material form:
- solid: particulate/powder
- Details on test material:
- Test item: (N-Cyclohexyl-diazeniumdioxy)-potassium
IUPAC name: Cyclohexylhydroxydiazene 1-oxide, potassium salt
Chemical name: Cyclohexylhydroxydiazene 1-oxide, potassium salt; synonyma: (N-Cyclohexyl-diazeniumdioxy)-potassium, K-HDO, K-NCH, Xyligen K powder, Xyligen K
Molecular formula: C6 H11 K N2 O2
Molecular mass: 182.27
Constituent 1
- Radiolabelling:
- no
Study design
- Inoculum or test system:
- activated sludge, non-adapted
- Details on inoculum:
- activated sludge
- Duration of test (contact time):
- 41 d
Initial test substance concentration
- Initial conc.:
- 100.7 mg/L
- Parameter followed for biodegradation estimation:
- test mat. analysis
- Details on study design:
- Test conditions according to OECD confirmatory test (Simulation Test – Aerobic Sewage Treatment: OECD 303 A: Activated Sludge Units)
Results and discussion
Half-life of parent compound / 50% disappearance time (DT50)
- Key result
- Compartment:
- activated sludge
- DT50:
- ca. 26 d
- Transformation products:
- not measured
- Evaporation of parent compound:
- no
- Details on results:
- In a weakly loaded biologically active system a degradation of > 90% within 41 days was reached.
Any other information on results incl. tables
Test results:
Duration of the degradation test in days |
Concentration of K-HDO in mg/L |
Biodegradation in % |
0 |
100.7 |
0 |
7 |
87.3 |
13 |
12 |
75.3 |
25 |
15 |
70.6 |
30 |
26 |
48.7 |
51 |
30 |
30.0 |
70 |
33 |
20.6 |
79 |
37 |
20.6 |
79 |
39 |
14.7 |
85 |
41 |
6.7 |
94 |
Applicant's summary and conclusion
Validity criteria
- Validity criteria fulfilled:
- not specified
- Conclusions:
- HDO is degraded biologically. In a weakly loaded biologically active system a degradation > 90 % within 41 days was reached.
- Executive summary:
Preliminary examinations and tests have been shown that only a small decrease of the tested substance occurs in a laboratory plant under standardized conditions and with 10 mg/l HDO. Even after prolongation of the dwell time to 24 hours the rate of decrease is only approx. 20 %. The decrease of HDO is possibly due to the loss during the preparation of the procedure in connection with the analytical determination of the test substance. However this result does not necessarily means that K-HDO is persistent. The prolongation of the dwell time to 6 days before stopping the test showed an unexpected decrease of the test substance of 68 %. The enforcement of a long-term test should clarify if HDO is degraded by micro-organisms – even with low speed. For this purpose a procedure was developed that allows to keep a steady-state biological active system in function over a longer period. The dwell time of the test substance in the purification plant can be prolonged to weeks and months.
The test conditions used to test K-HDO follow the OECD-Environment directorate proposed method for the determination of the biodegradability of surfactants used in synthetic detergents, Paris 1976 (Simulation Test – Aerobic Sewage Treatment: OECD 303 A: Activated Sludge Units)
The results prove that HDO is degraded biologically. In a weakly loaded biologically active system a degradation > 90 % within 41 days was reached.
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