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EC number: 800-660-7 | CAS number: 1258274-08-6
- 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
Aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts was characterized comprehensively. Partial degradation of aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts was found in a semi continuously fed activated sludge (SCAS) test. In this test a removal percentage of organic carbon of 57% was achieved. Using sludge adapted for 70 days in the SCAS unit did result in 30% biodegradation after 14 days in the Closed Bottle test. This percentage did not increase after this period. The biodegradation percentage of 30 achieved in the Closed Bottle test demonstrates that microorganisms capable of growing do not have the ability to completely biodegrade all compounds present in this test substance. The biodegradation percentage of 30 obtained in the Closed Bottle test would result in a 50% removal of the test substance by biodegradation at most in the SCAS test. It is therefore very likely that approximately 10% of the test substance administered in the SCAS test is removed by adsorption and/or volatilisation.
The effluent of the SCAS test unit was analysed with LC-MS/MS for four constituents. The biodegradation percentage of methylnaphthalenesulphonate is almost 100%. It is very likely that all isomers of methylnaphthalenesulphonate present in the test substance are completely biodegraded. Almost complete mineralization (75 to 90%) of naphthalene-2-sulphonate was demonstrated with pure cultures (Song et al, 2005). The introduction of a methyl group does probably not deteriorate the potential of microorganisms to degrade these substances. The introduction of a second methyl group results in a decrease of the biodegradation. Approximately 25% of the isomers are not degraded by microorganisms. Structural features that were found to decrease the biodegradation of alkylated naphthalenes include an increase in the number of methyl substituents and an increase in the size of the substituent. Dimethylnaphthalene isomers with adjacent methyl substituents are resistant to biodegradation (open literature). It is therefore likely that the 75% of the dimethylnaphthalenesulphonate isomers not detected in the effluent of the SCAS unit are completely biodegraded. The complete degradation of methylnaphthalene sulphonates and part of the dimethylnaphthalenesulphonate isomers could already account for approximately 25% degradation in the Closed Bottle test.
Introduction of a branched nonyl chain instead of a methyl group does not further reduce the biodegradability of naphthalene sulphonates. The nonyl chain itself will degrade slowly because of its branched. The presence of the nonyl chain may result in the attack of the sulphonate from the far-end of the alkyl chain resulting in partial oxidation. The introduction of a third substituent on naphthalene sulphonates does as found with alkylated naphthalenes decrease biodegradability of many isomers.
Based on the NPOC removal, Closed Bottle tests and the specific analysis it is concluded that biodegradation of aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts will only result in complete oxidation of methylnaphthalenesulphonates and part of the dimethylnaphthalenesulphonates. Removal of the nonylmethylnaphthalenes measured with LC-MS/MS is explained by oxidation of the far-end of the alkyl chain and adsorption onto the sludge.
Nonylmethylnaphthalenesulphonates are expected to adsorb due to the hydrophobic alkyl chain.
Effluent from the control unit spiked with the parent surfactant and the effluent of the SCAS unit containing the water-soluble biodegradation products of aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts, are both slightly toxic to algae. On the basis of the evaluation of the biodegradability tests it is proposed that primarily naphthalene sulphonates with nonyl chains will persist. The nonyl chain is responsible for the surfactancy of the test substance. Surfactancy and toxicity to aquatic organisms usually coincide. Decrease in toxicity due to the partial degradation of the test substance is therefore not expected.
In conclusion only part of the homologues and isomers of aromatic hydrocarbobs, C10 -13, reaction products with branched nonene, sulphonated, sodium salts are readily degraded. Partial degradation of the test substance does not result in a significant increase nor decrease of the toxicity to algae.
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