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EC number: 221-220-5 | CAS number: 3033-62-3
- 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
Repeated dose toxicity: inhalation
Administrative data
- Endpoint:
- sub-chronic toxicity: inhalation
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1988-04-11 - 1993-08-11
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study with acceptable restrictions
- Remarks:
- GLP study conducted according to internal laboratory standards and methods similar to OECD guidelines.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 993
- Report date:
- 1993
Materials and methods
Test guideline
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 413 (Subchronic Inhalation Toxicity: 90-Day Study)
- Principles of method if other than guideline:
- This project was conducted according to the protocol prepared by the Bushy Run Research Center (BRRC) and amendments 1, 2, 3, and 4.
Four groups, each consisting of 15 male and 15 female Sprague Dawley rats, were exposed 6 hours per day, 5 days per week, for 14 weeks to the test substance vapor at target concentrations of 0 (control), 0.22, 1.25, or 5.8 ppm. Ten rats per sex from each group were sacrificed after the exposure regimen; the remaining 5 rats per sex were sacrificed after a 6-week recovery period. A further 4 male and 4 female rats were added to the control and 5.8 ppm groups and assigned for perfusion-fixation sacrifice. Animals were sacrificed following the 6-hour exposure regimen on exposure day 1, 3, 5 or 10 (1/sex/group/sacrifice) and used for electron microscopic examination of nasal mucosa. Monitors for toxic effects included clinical observations, body weight, food and water consumption, hematology and serum clinical chemistry evaluations, urinalysis, urine chemistries, organ weights, and ophthalmic, gross pathologic and microscopic evaluations. - GLP compliance:
- yes
- Limit test:
- no
Test material
- Reference substance name:
- N,N,N',N'-tetramethyl-2,2'-oxybis(ethylamine)
- EC Number:
- 221-220-5
- EC Name:
- N,N,N',N'-tetramethyl-2,2'-oxybis(ethylamine)
- Cas Number:
- 3033-62-3
- Molecular formula:
- C8H20N2O
- IUPAC Name:
- {2-[2-(dimethylamino)ethoxy]ethyl}dimethylamine
- Test material form:
- liquid
Constituent 1
- Specific details on test material used for the study:
- - Name of test material (as cited in study report): N,N,N',N'-tetramethyl-2,2'-oxybis(ethylamine)
- Molecular formula (if other than submission substance): (CH3)2NCH2CH2OCH2CH2N(CH3)2
- Molecular weight (if other than submission substance): 160.26
- Substance type: Pure active substance
- Physical state: Light yellow liquid, slight amine odor
- Analytical purity: 97%
- Other: Complete solubility in water
- Lot/batch No.: S-0044117, reference no. 24VCB-65 A and B, BRCC (Sample numbers 51-486 and 51-487)
- Impurities (identity and concentrations): Unknown component (prestudy) 1.263% in sample 24VCB65A and 1.199% in sample 24VCB65B; unnknown component (post study) 0.901%.
- Composition of test material, percentage of components: Composition of test material, percentage of components: (prestudy analysis of sample 24VCB65A): dimethylamine 0.015%, N-methylmorpholine (NMM) 0.014%, dimethylethanolamine (DMEA) 0.492%, bis(2-dimethylaminoethyl)ether (A-99) 97.026%, N-methylaminoethoxy-N,N-dimethylethylamine 0.082%, 2-(2-dimethylaminoethoxy)ethanol (DMEE) 1.108%, unknowns 1.263%. (poststudy analysis of sample 24VCB65B): dimethylamine 0.017%, N-methylmorpholine (NMM) 0.014%, dimethylethanolamine (DMEA) 0.483%, bis(2-dimethylaminoethyl)ether (A-99) 97.114%, N-methylaminoethoxy-N,N-dimethylethylamine 0.084%, 2-(2-dimethylaminoethoxy)ethanol (DMEE) 1.089%, unknowns 1.199%.
Test animals
- Species:
- rat
- Strain:
- Sprague-Dawley
- Sex:
- male/female
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Source: Harlan Sprague Dawley, Inc. (Frederick, MD)
- Age at study initiation: 35 days
- Weight at study initiation: Males in exposure groups 0, 0.22, 1.25, and 5.8 ppm had mean weights of 255.1, 254.1, 255.1, and 254.3 g, respectively. Females in exposure groups 0, 0.22, 1.25, and 5.8 ppm had mean weights of 169.6, 169.5, 167.2, and 168.5 g, respectively.
- Fasting period before study: Food and water withheld during exposure
- Housing: Housed two per cage in stainless steel, wire-mesh cages, 23.5 cm x 20 cm x 18 cm for approximately two weeks (acclimation period) and individually. The recovery animals were individually housed in the same size cages in a Relocatable Containment Systeme Unit housed during the 14-week exposure regimen. During the exposures, the animals were individually housed, separated by sex and exposure group, in stainless steel, wire-mesh cages (35 cm x 17 cm x 18 cm).
- Diet (e.g. ad libitum): Powdered certified Agway Prolab Animal Diet Rat, Mouse, Hamster 3200 (Agway Inc.); ad libitum
- Water (e.g. ad libitum): Water (Municipal Authority of Westmoreland County, Greensburg, PA) provided by an automatic watering system was available ad libitum, except during the water consumption measurement period.
- Acclimation period: Two weeks
ENVIRONMENTAL CONDITIONS
- Temperature (°C): Mean chamber temperature: 22-25 deg C. General conditions in Evaporator: 0.22 ppm exposure group (top): 46, 50, 55 deg C (bottom): 44, 33, 30 deg C; 1.25 ppm exposure group (top): 41, 45, 50 deg C (bottom): 33, 36, 40; 5.80 ppm exposure group (top): 68, 51, 49 deg C (bottom): 48, 39, 39 deg C. Housing conditions: 18-22 deg C.
- Humidity (%): Mean chamber relative humidity: 36-57%, Housing conditions: 41-62%.
- Air changes (per hr): 21 air changes per hr
- Photoperiod (hrs dark / hrs light): 12-hr photoperiod
IN-LIFE DATES: From: 12/5/1988 To: 3/9-10/1989 (necropsy at 14 wks) or 4/21/1989 (group with additional 6 wks of recovery)
Administration / exposure
- Route of administration:
- inhalation: vapour
- Type of inhalation exposure:
- whole body
- Vehicle:
- air
- Remarks on MMAD:
- MMAD / GSD: N/A
- Details on inhalation exposure:
- GENERATION OF TEST ATMOSPHERE / CHAMBER DESCRIPTION
- Exposure apparatus: Stainless steel with glass windows, approximately 4320 liters
- Method of holding animals in test chamber: Whole body exposure
- Source and rate of air: N/A
- Method of conditioning air: N/A
- System of generating particulates/aerosols: Liquid test substance was metered with a Sage Model 355 syringe pump into a heated glass evaporator. The temperature in the evaporator was maintained at the lowest level sufficient to vaporize the liquid. The resultant vapor was carried into the chamber by a countercurrent air stream that entered the bottom of the evaporator.
- Temperature, humidity, pressure in air chamber: Evaporator temperatures ranged from 42 to 66 deg C.
- Air flow rate: approximately 1500 liters/minute
- Air change rate: 21 air changes per hour
- Method of particle size determination: N/A
- Treatment of exhaust air: N/A
TEST ATMOSPHERE
- Brief description of analytical method used: Chamber concentrations of the test substance were analyzed approximately once every 30 to 120 minutes (depending on the target concentration) by gas chromatography of impinger solutions containing samples of the chamber atmosphere.
- Samples taken from breathing zone: No
VEHICLE (if applicable)
- Justification for use and choice of vehicle: N/A
- Composition of vehicle: N/A
- Type and concentration of dispersant aid (if powder): N/A
- Concentration of test material in vehicle: N/A
- Lot/batch no. of vehicle (if required): N/A
- Purity of vehicle: N/A - Analytical verification of doses or concentrations:
- yes
- Details on analytical verification of doses or concentrations:
- Chamber concentrations of the test substance were analyzed approximately once every 30 to 120 minutes (depending on the target concentration) by gas chromatography of impinger solutions containing samples of the chamber atmosphere.
- Duration of treatment / exposure:
- 14 weeks
- Frequency of treatment:
- 6 hours/day, 5 days/week
Doses / concentrationsopen allclose all
- Dose / conc.:
- 1.51 mg/m³ air (nominal)
- Remarks:
- 0.22 ppm
- Dose / conc.:
- 8.2 mg/m³ air (nominal)
- Remarks:
- 1.25 ppm
- Dose / conc.:
- 38 mg/m³ air (nominal)
- Remarks:
- 5.8 ppm
- No. of animals per sex per dose:
- 15/sex/dose
- Control animals:
- yes
- Details on study design:
- - Dose selection rationale: A series of acute inhalation exposures with the test substance were conducted at the BRRC Laboratory. When the test substance was generated dynamically (heated evaporator or bubbler method), the 6-hour LC50 value (with 95% confidence limits) for male and female Sprague Dawley rats was 166 (155 to 178) ppm. Clinical signs of ocular and respiratory irritation were observed in all exposure groups (68, 149, 200, and 248 ppm). The principal gross lesions observed at necropsy were dark red discoloration of the lungs, and encrustation around the eyes and nose. Rats exposed for 6 hours to test substance vapor generated statically survived the 14-day postexposure period. However, under static generation conditions, the test substance chamber concentration was only 24 ppm because the high chamber relative humidity (82%) lowered the vapor concentration.
- Rationale for animal assignment (if not random): Computer-based randomization program. At the time of group assignment, only animals with body weights within two standard deviations of the mean for each sex were used in the study. Any animal observed to be in poor health was rejected from group assignment.
- Rationale for selecting satellite groups: Ten rats per sex from each group were sacrificed after the exposure regimen; the remaining 5 rats per sex were sacrificed after a 6-week recovery period. A further 4 male and 4 female rats were added to the control and 5.8 ppm groups and assigned for perfusion-fixation sacrifice.
- Post-exposure recovery period in satellite groups: 6 weeks
- Section schedule rationale (if not random): Computer-based randomization program
Examinations
- Observations and examinations performed and frequency:
- CAGE SIDE OBSERVATIONS: Yes
- Time schedule: Before and after exposure on an individual basis, during exposure on a group basis.
- Cage side observations checked: Overt clinical signs of toxicity.
DETAILED CLINICAL OBSERVATIONS: Yes
- Time schedule: At the time of body weight collection and just preceding sacrifice.
BODY WEIGHT: Yes
- Time schedule for examinations: Prior to initiation of the first exposure, also weighed on the morning preceding the second day (day 2), and days 5, 8, 9 and 12 (prior to sacrifice). Control animals were weighed on the morning preceding the third (Day 3) exposure due to unexpected weight losses in all groups on the morning preceding the second exposure. Animals designated for the 21-day recovery were weighed once each week during the
recovery period (Days 19, 26, and 33).
FOOD CONSUMPTION:
- Food consumption for each animal determined and mean daily diet consumption calculated as g food/kg body weight/day: Yes; Food consumption was measured for approximately 15 hours following 8 exposures for the male rats and following 9 exposures for the female rats, while in metabolism cages.
FOOD EFFICIENCY:
- Body weight gain in kg/food consumption in kg per unit time X 100 calculated as time-weighted averages from the consumption and body weight gain data: No
WATER CONSUMPTION: Yes
- Time schedule for examinations: Water consumption was measured for approximately 15 hours following 8 exposures for the male rats and following 9 exposures for the female rats, while in metabolism cages.
OPHTHALMOSCOPIC EXAMINATION: Yes
- Time schedule for examinations: Prior to the first exposure, the eyes were examined by a veterinarian using an external light source and a magnifying lens. During the second week of the exposure regimen, eyes were examined immediately after the ninth (and final) exposure (all groups) and were examined again the following morning (high and intermediate test and control groups). Recovery group animals were also examined 2 weeks following the last exposure.
- Dose groups that were examined: All animals
HAEMATOLOGY: Yes
- Time schedule for collection of blood:
- Anaesthetic used for blood collection: Yes (methoxyflurane)
- Animals fasted: Yes, food was removed at the start of blood collection.
- How many animals: All animals
- Parameters checked: erythrocyte count, platelet count, hemoglobin, leukocyte count, hematocrit, differential leukocyte count, mean corpuscular volume, reticulocyte count, mean corpuscular hemoglobin, mean corpuscular hemoglobin concentration.
CLINICAL CHEMISTRY: Yes
- Time schedule for collection of blood: At the time of scheduled sacrifice.
- Animals fasted: Yes, food was removed at the start of blood collection.
- How many animals: all animals
- Parameters checked: glucose, calcium, urea nitrogen, phosphorus, creatinine, sodium, total protein, potassium, albumin, chloride, globulin, total bilirubin, direct bilirubin, indirect bilirubin, aspartate aminotransferase, alanine aminotransferase, creatine kinase, lactic dehydrogenase, gamma-glutamyl transferase, sorbitol dehydrogenase, alkaline phosphatase.
URINALYSIS: Yes
- Time schedule for collection of urine: Approximately 15 hours following each exposure.
- Metabolism cages used for collection of urine: Yes
- Animals fasted: Yes, food was removed at the start of blood collection.
- Parameters checked: Volume, color, turbidity, osmolality, microscopic constituents, pH, protein (quantitative), protein, creatinine, glucose, sodium,
ketone, potassium, bilirubin, chloride, blood, creatinine, clearance urobilinogen (estimate).
NEUROBEHAVIOURAL EXAMINATION: No
- Time schedule for examinations: N/A
- Dose groups that were examined: N/A
- Battery of functions tested: sensory activity / grip strength / motor activity / other: N/A
OTHER: Animals were sacrificed following the 6-hour exposure regimen on exposure day 1, 3, 5 or 10 (l/sex/group/sacrifice) and used for electron microscopic examination of nasal mucosa. - Sacrifice and pathology:
- GROSS PATHOLOGY: Yes; all animals except those assigned to the recovery group were sacrificed the morning of the day following the final exposure. The remaining rats were sacrificed 3 weeks later. A complete necropsy was performed on each animal and all tissues were fixed in 10% neutral buffered formalin or Bouin's fixative for histologic evaluations. Five rats/sex from the control and high concentration groups were perfused with formaldehyde:glutaraldehyde solution for fixation of the lungs, liver, coronary artery, skin (dorsum of head and ear), spleen, and cornea for possible examination by electron microscopy.
HISTOPATHOLOGY: Yes; tissues fixed for microscopic examination included: brain, nasal turbinates, 1arynx, trachea, lungs, eyes, liver, kidneys, adrenals, spleen, testes, ovaries, lymph nodes (submandibular), heart, thymus, skin (dorsum of head, ears, and eyelids), gross lesions. - Other examinations:
- The brain, liver, kidneys, lungs, spleen, and heart from all animals and the testes from all males were weighed at necropsy. Organ weights were recorded as absolute weights and as a percentage of both body and brain weights.
- Statistics:
- Results of quantitative continuous variables (e.g., body weight change) were intercompared for the three exposure groups and one control group by use of Bartlett's test for homogeneity of variances, analysis of variance (ANOVA), and Duncan's multiple range test. The latter was used, if F for the ANOVA was significant, to delineate which groups differed from the control. If Bartlett's test indicated heterogeneous variances, all groups were compared by an ANOVA for unequal variances followed, if necessary, by t-tests. A two-sample t-test was used to compare the control group to the high concentration exposure group for the recovery animals. The fiducial limit of 0.05 (two-tailed) was used as the critical level of significance for all comparisons.
Results and discussion
Results of examinations
- Clinical signs:
- effects observed, treatment-related
- Description (incidence and severity):
- Signs of ocular and respiratory irritation were observed during the 14-week exposure and 6-week recovery periods and included swollen periocular tissue in rats from all exposure groups and periocular and perinasal encrustation in rats from the 5.8 ppm group. Periocular encrustation was also observed in males from the 1.25 ppm group. An additional sign observed primarily in animals from the 5.8 ppm group was cloudiness in the eyes. Detailed ophthalmic examination revealed keratitis in males from the 5.8 ppm group and females from the 1.25 and 5.8 ppm groups.
- Mortality:
- mortality observed, treatment-related
- Description (incidence):
- No mortalities occurred during the study.
- Body weight and weight changes:
- effects observed, treatment-related
- Description (incidence and severity):
- Body weight losses were observed for both sexes from the 5.8 ppm group at the end of the first week of exposure. Body weight gain in males from the 5.8 ppm group was statistically significantly lower throughout the 14-week exposure period; the percent decreased in body weight gain at week 14 was 18%. Body weight gain in females from the 5.8 ppm group was slightly reduced during the 14-weeek study period, although not statistically significant; the percent decrease in body weight gain at week 14 was 9%. Absolute body weight in the males from the 5.8 ppm group was slightly lower throughout the study; however, a statistical difference was achieved only at week 14. The percent decrease in body weight at week 14 was 6.5%. No statistically significant differences in absolute body weight were observed in females from the 5.8 ppm group. Also, no effects on body weight were observed in males and females from the 0.23 and 1.25 ppm groups during the study.
During the 6-week recovery period, body weight gain for both sexes from the 5.8 ppm group indicated some recovery (body weight gain was 14.5 and 5.2% lower than the controls at the end of the recovery period for males and female animals, respectively. No statistical differences were observed in body weight for the 5.8 ppm group during the recovery period. - Food consumption and compound intake (if feeding study):
- effects observed, treatment-related
- Description (incidence and severity):
- A statistically significant decrease in food consumption was observed in females from the 5.8 ppm group at the end of the 14-week exposure regimen; the percent decrease in fool consumption was 18%. No statistically significant differences in food consumption were observed in males of any exposure group.
- Food efficiency:
- not examined
- Water consumption and compound intake (if drinking water study):
- effects observed, treatment-related
- Description (incidence and severity):
- A statistically significant increase in water consumption was observed in males from the 5.8 group at the end of the exposure regimen; the percent increase in water consumption was 21%. No other differences in water consumption were observed in males and females from any exposure group.
- Ophthalmological findings:
- effects observed, treatment-related
- Description (incidence and severity):
- During week 13, keratitis (mostly in mild degree) was observed in all rats from the 5.8 ppm group. In addition, minimal keratitis was observed in 6 females from the 1.25 ppm group.
- Haematological findings:
- no effects observed
- Clinical biochemistry findings:
- no effects observed
- Description (incidence and severity):
- Serum chemistry revealed no consistent or concentration-related effects.
- Urinalysis findings:
- effects observed, treatment-related
- Description (incidence and severity):
- Urinalysis results showed slight decreases in creatinine, sodium, potassium, and chloride in both sexes from the 5.8 ppm group at 14 weeks.
- Behaviour (functional findings):
- not examined
- Immunological findings:
- not examined
- Organ weight findings including organ / body weight ratios:
- effects observed, treatment-related
- Description (incidence and severity):
- Exposure-related increases in relative organ weights were observed for the adrenals and testes of males from the 5.8 ppm group at the 14-week time point, but not after the 6-week recovery period. These organs showed no histologic abnormalities.
- Gross pathological findings:
- effects observed, treatment-related
- Description (incidence and severity):
- At necropsy, color changes of the eyes (5.8 ppm group at the 14-week sacrifice only) and swollen periocular tissue (1.25 and/or 5.8 ppm groups at both 14- and 20-week sacrifices) were observed.
- Neuropathological findings:
- not examined
- Histopathological findings: non-neoplastic:
- no effects observed
- Histopathological findings: neoplastic:
- no effects observed
- Description (incidence and severity):
- Exposure-related microscopic lesions were seen only in tissues receiving direct contact with the chemical (exposed skin, eyes, ears, and the upper respiratory tract) and consisted of cytoplasmic vacuolation of the exposed epithelium, accompanied by varying degrees of necrosis, inflammation, and degeneration of superficial and deeper tissues. Lesions involving the nasal cavities were present in rats of both sexes from all exposure groups at both 14- and 20-week sacrifices, while lesions involving the other tissues were generally observed only in the 5.8 ppm group at the 14-week sacrifice. Electron microscopic evaluations of the anterior nasal turbinates of the 5.8 ppm group rats showed lesions consisting of intracytoplasmic membrane-bound vacuoles in the mucosal epithelium after one exposure, and in the mucosa and submucosa after 3 and 5 exposures (this evaluation was not performed after 10 exposures). The vacuoles appear to be derived from the coalescence of many small secretory vesicles produced by the Golgi apparatus.
- Other effects:
- not specified
Effect levels
open allclose all
- Dose descriptor:
- LOAEC
- Remarks:
- Local Toxicity
- Effect level:
- <= 1.51 mg/m³ air
- Based on:
- test mat.
- Sex:
- male/female
- Basis for effect level:
- other: Various signs of irritation of the eye and respiratory tract at all concentrations were observed.
- Key result
- Dose descriptor:
- NOAEC
- Remarks:
- Systemic Toxicity
- Effect level:
- 8.2 mg/m³ air
- Based on:
- test mat.
- Sex:
- male/female
- Basis for effect level:
- other: Minor, nonspecific systemic toxicity at 38 mg/m3 and no target organ toxicity.
Target system / organ toxicity
- Critical effects observed:
- no
Applicant's summary and conclusion
- Conclusions:
- Repeated exposure of rats to the test substance vapor at 0.23, 1.25, and 5.8 ppm for 14 weeks produced no mortality, indications of possible minor, nonspecific systemic toxicity at 5.8 ppm and no target organ toxicity, but various signs of irritation of the eye and respiratory tract at all concentrations was observed. Thus, a NOEL could not be determined for irritancy under the conditions of this study. However, a NOAEC for systemic effects is considered to be 1.25 ppm (8.2 mg/m3).
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