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EC number: 939-464-2 | CAS number: 121617-08-1
- 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
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- 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
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- 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

Toxicological Summary
- Administrative data
- Workers - Hazard via inhalation route
- Workers - Hazard via dermal route
- Workers - Hazard for the eyes
- Additional information - workers
- General Population - Hazard via inhalation route
- General Population - Hazard via dermal route
- General Population - Hazard via oral route
- General Population - Hazard for the eyes
- Additional information - General Population
Administrative data
Workers - Hazard via inhalation route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 4.1 mg/m³
- Most sensitive endpoint:
- repeated dose toxicity
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 25
- Dose descriptor starting point:
- NOAEL
- Value:
- 85 mg/kg bw/day
- Modified dose descriptor starting point:
- NOAEC
- Value:
- 102.48 mg/m³
- AF for dose response relationship:
- 1
- Justification:
- no other uncertainties
- AF for differences in duration of exposure:
- 2
- Justification:
- sub-chronic to chronic
- AF for interspecies differences (allometric scaling):
- 1
- Justification:
- incorporated in the calculation of the corrected inhalation NOAEC
- AF for other interspecies differences:
- 2.5
- Justification:
- toxicokinetic/toxicodynamic differences
- AF for intraspecies differences:
- 5
- Justification:
- DNEL derived for the workers
- AF for the quality of the whole database:
- 1
- Justification:
- the database is complete
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown (no further information necessary)
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- hazard unknown (no further information necessary)
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown (no further information necessary)
DNEL related information
Workers - Hazard via dermal route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 5.29 mg/kg bw/day
- Most sensitive endpoint:
- repeated dose toxicity
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 100
- Dose descriptor starting point:
- NOAEL
- Value:
- 85
- Modified dose descriptor starting point:
- NOAEL
- Value:
- 529.31 mg/kg bw/day
- Explanation for the modification of the dose descriptor starting point:
- No dermal repeated-dose toxicity study is available either for LAS TEA or LAS Na. A study is available for TEA, which is considered relevant for the toxicity of LAS TEA. However, a route-to-route extrapolation from the oral NOAEL was chosen for the derivation of the dermal DNEL, since the NOAEL of the dermal repeated dose study with TEA is much higher, than the NOAEL of the oral repeated dose study with LAS Na.
- AF for dose response relationship:
- 1
- Justification:
- no other uncertainties
- AF for differences in duration of exposure:
- 2
- Justification:
- sub-chronic to chronic
- AF for interspecies differences (allometric scaling):
- 4
- Justification:
- rat to humans
- AF for other interspecies differences:
- 2.5
- Justification:
- toxicokinetic/toxicodynamic differences
- AF for intraspecies differences:
- 5
- Justification:
- DNEL for workers
- AF for the quality of the whole database:
- 1
- Justification:
- the data base is sufficient
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- hazard unknown (no further information necessary)
Acute/short term exposure
- Hazard assessment conclusion:
- medium hazard (no threshold derived)
- Most sensitive endpoint:
- skin irritation/corrosion
Workers - Hazard for the eyes
Local effects
- Hazard assessment conclusion:
- medium hazard (no threshold derived)
Additional information - workers
According to ECHA’s guidance R.8 a leading DN(M)EL needs to be derived for the workers for every relevant route, duration and frequency of exposure, when this is feasible.
Acute toxicity data for LAS TEA indicate very low toxicity: in rats the oral LD50 was 2928 mg/kg bw/day, while the dermal LD50 for LAS Na and for TEA was > 2000 mg/kg bw/day. The substance shall not be classified for oral and acute dermal toxicity, and hence no DNELacuteshall be derived.The long-term oral and dermal DNELs workers are considered sufficient for controlling any risks that may arise from exposure to LAS TEA.Inhalation exposure was considered the least relevant route, and high peak exposures through inhalation are not expected to occur.
LAS TEA is a skin irritant (Skin Irrit. 2, H315) and damaging to the eyes (Eye Dam. 1, H318). However, no dose-response data are available and hence, a DNEL cannot be derived for these endpoints.
No repeated dose toxicity studies were performed with LAS TEA. The endpoint was addressed with data from LAS Na and TEA. There are three repeated dose oral toxicity studies with LAS Na. The lowest LOAEL is from the 6-month rat study (Yoneyama et al., 1972) with a LOAEL of 115 mg/kg bw. The highest NOAEL below this LOAEL is from the 9-month rat study (Yoneyama et al., 1976) with NOAEL = 85 mg/kg bw. In view of the available information it is not possible to determine which single study among those is the most reliable or appropriate for the determination of a NOAEL. Therefore, based on the data from all the studies, a NOAEL of 85 mg/kg bw is proposed, which was derived from a 9- month oral study and corresponds to the NOAEL, which is closest to the lowest available oral LOAEL of 115 mg/kg bw. The NOAEL observed in the repeated dose study with TEA was much higher (1000 mg/kg bw/day) and hence, LAS Na is much more toxic than TEA. Based on this reasoning the NOAEL= 85 mg/kg bw/day from the oral repeated-dose (9 months) toxicity study with LAS Na was used for the derivation of a long-term DNEL for LAS TEA.
Oral NOAEL LAS Na= 85 mg/kg bw/day; the oral NOAEL for LAS TEA was calculated by scaling based on the molecular weight of the susbstance. The conversion factor from LAS Na is 1.37 and the conversion factor from TEA is 3.19. The oral NOAEL LAS TEA= 116.45 mg/kg bw/day.This oral NOAEL was used in order to extrapolate to a dermal NOAEL. There is no available information on the dermal absorption of LAS TEA, and hence, data for the dermal absorption of sodium dodecylbenzenesulfonate (CAS 25155-30-0) and of triethanolamine were used. LAS TEA is not expected to have a higher dermal uptake. The highest absorpiton rate was recorded for TEA, in an in vitro test with human skin (22%) and thus, it was used for the route-to-route extrapolation. ECHA’s guidance Dose [concentration]-response regarding human health R.8.4.2 pag. 25 "On the assumption that, in general, dermal absorption will not be higher than oral absorption, no default factor (i.e. 1) should be introduced when performing oral-to-dermal extrapolation". Hence, NOAELdermal = oral NOAEL * ABSoral-rat/ABSoral-human <=> corrected NOAEL dermal = 116.45 * (1/0.22) = 529.31 mg/kg bw.
Assessment factors used:
Allometric scaling (rat): 4
Intraspecies (workers): 5
Residual interspecies: 2.5
Sub-chronic to chronic: 2
AF total: 100
This results in adermal DNELlong-term= 5.29 mg/kg bw/day.
Since no inhalation data are available, cause it is not the most relevant exposure route, an inhalation DNEL was also derived on a route-to route extrapolation basis. In order to extrapolate from an oral NOAEL to an inhalation NOAEC, absorption needs to be taken into account. There is no available information on the toxicokinetic behavior and absorption of LAS TEA, LAS Na or TEA within the pulmonary alveoli. ECHA’s guidance Dose [concentration]-response regarding human health R.8.4.2 pag. 25 states: "In the absence of substance-specific data on absorption, it is proposed, thus, to include a default factor of 2 (i.e. the absorption percentage for the starting route is half that of the end route) in the case of oral-to-inhalation extrapolation". Besides the absorption, the standard respiratory volume (sRV) needs to be considered, e.g. during 8 hours light activity at work the respiratory rate becomes higher than standard. This deviation is consistent with the assumption of a total breathing volume of 10 m3for an 8-hour shift and light activity at work. In the case of 8h exposure, it is assumed that the respiratory volume is 6.7 m3/person. The extrapolation from the sRV of rat to human is performed using the default assumption of 0.38 m3/kg bw (8 hours exposure):
corrected inhalation NOAEL= oral NOAEL * (1/sRVrat) * (ABSoral-rat/ABSinh-human) * (sRVhuman/wRV)<=> corrected inhalation NOAEL = 116.45 * (1/0.38 m3/kg/d) * (1/2) *(6.7 m3/10 m3) = 102.48 mg/m3(page 27), where ABS: Absorption; sRV: standard Respiratory Volume; wRV: worker Respiratory Volume
To derive the inhalation DNEL, the same assessment factors as for the derivation of the oral and dermal DNEL were applied, except for the allometric scalling that has been already applied for the corrected inhalation NOAEL. The overall assessment factor is 25.
This results in an inhalation DNELlong-term= 4.1 mg/m3for workers.
LAS TEA is not mutagenic and is not considered carcinogenic for humans. Based on the available data, LAS TEA is not considered a reproductive and developmental toxicant.
General Population - Hazard via inhalation route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 1.01 mg/m³
- Most sensitive endpoint:
- repeated dose toxicity
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 50
- Modified dose descriptor starting point:
- NOAEC
- Value:
- 50.63 mg/m³
- AF for dose response relationship:
- 1
- Justification:
- no other uncertainties
- AF for differences in duration of exposure:
- 2
- Justification:
- sub-chronic to chronic
- Justification:
- incorporated in the corrected inhalation NOAEC
- AF for other interspecies differences:
- 2.5
- Justification:
- toxicokinetic/toxicodynamic differences
- AF for intraspecies differences:
- 10
- Justification:
- DNEL for the general population
- AF for the quality of the whole database:
- 1
- Justification:
- the data base is sufficient
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown (no further information necessary)
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- hazard unknown (no further information necessary)
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown (no further information necessary)
DNEL related information
General Population - Hazard via dermal route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 1.2 mg/kg bw/day
- Most sensitive endpoint:
- repeated dose toxicity
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 200
- Modified dose descriptor starting point:
- NOAEL
- Value:
- 249 mg/kg bw/day
- Explanation for the modification of the dose descriptor starting point:
- No dermal repeated-dose toxicity study is available either for LAS TEA or LAS Na. A study is available for TEA, which is considered relevant for the toxicity of LAS TEA. However, a route-to-route extrapolation from the oral NOAEL was chosen for the derivation of the dermal DNEL, since the NOAEL of the dermal repeated dose study with TEA is much higher, than the NOAEL of the oral repeated dose study with LAS Na.
- AF for dose response relationship:
- 1
- Justification:
- no other uncertainties
- AF for differences in duration of exposure:
- 2
- Justification:
- sub-chronic to chronic
- AF for interspecies differences (allometric scaling):
- 4
- Justification:
- rat to humans
- AF for other interspecies differences:
- 2.5
- Justification:
- toxicokinetic/toxicodynamic differences
- AF for intraspecies differences:
- 10
- Justification:
- DNEL for general population
- Justification:
- the data base is sufficient
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- medium hazard (no threshold derived)
- Most sensitive endpoint:
- skin irritation/corrosion
Acute/short term exposure
- Hazard assessment conclusion:
- medium hazard (no threshold derived)
- Most sensitive endpoint:
- skin irritation/corrosion
General Population - Hazard via oral route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 0.58 mg/kg bw/day
- Most sensitive endpoint:
- repeated dose toxicity
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 200
- AF for dose response relationship:
- 1
- Justification:
- no other uncertainties
- AF for differences in duration of exposure:
- 2
- Justification:
- sub-chronic to chronic
- AF for interspecies differences (allometric scaling):
- 4
- Justification:
- rat to humans
- AF for other interspecies differences:
- 2.5
- Justification:
- toxicokinetic/toxicodynamic differences
- AF for intraspecies differences:
- 10
- Justification:
- DNEL derived for the general population
- AF for the quality of the whole database:
- 1
- Justification:
- the database is complete
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
- Route of original study:
- Oral
DNEL related information
General Population - Hazard for the eyes
Local effects
- Hazard assessment conclusion:
- medium hazard (no threshold derived)
Additional information - General Population
According to ECHA’s guidance R.8 a leading DN(M)EL needs to be derived for every relevant human population and every relevant route, duration and frequency of exposure, when this is feasible.
Acute toxicity data for LAS TEA indicate very low toxicity: in rats the oral LD50 was 2928 mg/kg bw/day, while the dermal LD50 for LAS Na and for TEA was > 2000 mg/kg bw/day. The substance shall not be classified for oral and acute dermal toxicity, and hence no DNELacuteshall be derived.The long-term oral and dermal DNELs for the general public are considered sufficient for controlling any risks that may arise from exposure to LAS TEA.Inhalation exposure was considered the least relevant route, and high peak exposures through inhalation are not expected to occur.
LAS TEA is a skin irritant (Skin Irrit. 2, H319) and damaging to the eyes (Eye Dam. 1, H318). However, no dose-response data are available and hence, a DNEL cannot be derived for these endpoints.
Similarly, as for the workers (see explanation above) the oral NOAEL LAS Na of 85 mg/kg bw/day was used for the derivation of DNELs; the oral NOAEL for LAS TEA was calculated by scaling based on the molecular weight of the susbstance. The conversion factor from LAS Na is 1.37 and the conversion factor from TEA is 3.19. The oral NOAEL LAS TEA= 116.45 mg/kg bw/day.
Assessment factors used:
Allometric scaling (rat): 4
Intraspecies (gen. pub.): 10
Residual interspecies: 2.5
Sub-chronic to chronic: 2
AF total: 200
This results in an oral DNELlong-term= 0.58 mg/kg bw/day.
The oral NOAEL for rats (116.45 mg/kg bw/day) was used in order to extrapolate to a dermal NOAEL. There is no available information on the dermal absorption of LAS TEA, and hence, data for the dermal absorption of sodium dodecylbenzenesulfonate (CAS 25155-30-0) and of triethanolamine were used. LAS TEA is not expected to have a higher dermal uptake. The highest absorption rate was recorded for TEA, in an in vitro test with human skin (22%) and thus, it was used for the route-to-route extrapolation. ECHA’s guidance Dose [concentration]-response regarding human health R.8.4.2 pag. 25 "On the assumption that, in general, dermal absorption will not be higher than oral absorption, no default factor (i.e. 1) should be introduced when performing oral-to-dermal extrapolation". Hence, NOAELdermal = oral NOAEL * ABSoral-rat/ABSoral-human <=> corrected NOAEL dermal = 116.45 * (1/0.22) = 529.31 mg/kg bw. The same assessment factors used for the derivation of the oral DNEL were applied. This results in a dermal DNELlong-term= 2.65 mg/kg bw/day.
Since no inhalation data are available, because it is not the most relevant exposure route, an inhalation DNEL was also derived on a route-to route extrapolation basis. In order to extrapolate from an oral NOAEL to an inhalation NOAEC, absorption needs to be taken into account. There is no available information on the toxicokinetic behavior and absorption of LAS TEA, LAS Na or TEA within the pulmonary alveoli. ECHA’s guidance Dose [concentration]-response regarding human health R.8.4.2 pag. 25 states: "In the absence of substance-specific data on absorption, it is proposed, thus, to include a default factor of 2 (i.e. the absorption percentage for the starting route is half that of the end route) in the case of oral-to-inhalation extrapolation". The extrapolation from the sRV of rat to human is performed using the default assumption of 1.15 m3/kg bw (24 hours exposure). Hence:
corrected inhalation NOAEL = oral NOAEL * (1/sRVrat) * (ABSoral-rat/ ABSinh-human) <=> corrected inhalation NOAEL = 116.45 * (1/1.15) * (1/2) = 50.63 mg/m3, where ABS: Absorption; sRV: standard Respiratory Volume.
To derive the inhalation DNEL for the general public, the same assessment factors as for the derivation of the oral and dermal DNEL were applied, except for the allometric scalling that has been already applied for the corrected inhalation NOAEL.
This results in an inhalation DNELlong-term= 1.01 mg/m3
LAS TEA is not mutagenic and is not considered carcinogenic for humans. Based on the available data, LAS TEA is not considered a reproductive and developmental toxicant.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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