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EC number: 295-835-2 | CAS number: 92129-33-4
- 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
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
- Half-life in freshwater sediment:
- 500 d
Additional information
Degradation in water
Ultimate and primary biodegradation of Quaternary ammonium compounds, di-C16-18 (even numbered) -alkyldimethyl, chlorides were assessed in the frame of an OECD 303A test.
At least 95% of Quaternary ammonium compounds, di-C16-18 (even numbered) -alkyldimethyl, chlorides are eliminated from waste waters after passing the treatment unit. The fraction of the substance in the sludge decreases continuously. Primary biodegradation is high.
This percentage demonstrates that Quaternary ammonium compounds, di-C16-18 (even numbered) -alkyldimethyl, chlorides is
almost completely removed by biodegradation from the wastewater by biodegradation in conventional biological wastewater treatment plants. In the European risk assessment reference is also made to Hoechst study (Zahn-Wellens-test, OECD 302B with industrial activated sewage sludge), in which DHTDMAC was eliminated to more than 70% after 3 hours. Elimination reached 92 % after 15 days, measured as DOC reduction. A rate of biological degradation could not be determined (Hoechst AG, 1993a). An OECD-confirmatory test was conducted with DHTDMAC and activated sludge from a domestic wastewater treatment plant (Hoechst AG, 1989b). The system was dosed with increasing concentrations of 0.5 -5 mg/L. Based on the concentration of disulfineblue active substance in the effluent of the test system the elimination was higher than 95% after 10 days. Most of the data referring to the elimination in wastewater treatment plants do not distinguish between biodegradation and adsorption. Therefore no degradation constant can be derived but an elimination of 95% is used in the following calculations based on the monitoring data. It can be estimated that about 55% of the elimination are attributable to adsorption.Degradation in sediment
For degradation in sediments, simulation tests are lacking. One test on degradation in river water spiked with sediment was performed (Larson & Vashon, 1983). In river water alone (50 mg/L suspended solids, < 25 mg/L sediment), degradation was low (8% of 0.05 mg/L and 19% of 0.5 mg/L in 28 days). After 63 days the degradation results are not much higher (11% and 22% respectively), and the degradation curve ends in a plateau, suggesting that degradation will not continue. However, in the presence of higher amount of sediment (5g/L), degradation was significantly higher (43% of 0.05 mg/L after 28 days and 65% after 63 days).
The available monitoring data reveal that biodegradation in environmental sediments is lower. Hellmann (1995) found an increase of the DHTDMAC concentration at high river flows. As the causes whirling of sediments and rinsing of agricultural soil during strong rainfalls are stated. These results indicate that DHTDMAC adsorbed onto sediments is not or very slowly degraded. A degradation rate cannot be derived from the monitoring data. Therefore, analogously to the degradation in soil, a half-life of 500 d (k = 1.4 . 10-3 d-1) for the aerobic sediment layer is used in the exposure assessment.
There is no hint that Quaternary ammonium compounds, di-C16-18 (even numbered) -alkyldimethyl, chlorides can be degraded under anaerobic conditions.
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