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EC number: 203-745-1 | CAS number: 110-19-0
- 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
![](https://echa.europa.eu/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_toxicological-information.png)
Repeated dose toxicity: inhalation
Administrative data
- Endpoint:
- sub-chronic toxicity: inhalation
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- From 12 SEP 1994 to 16 AUG 1996
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Guideline Study (EPA OTS 798.2450), but as read-across from supporting substance maximum reliability is 2 Read-across hypothesis: for details please see read-across report in section 13
Data source
Referenceopen allclose all
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 996
- Report date:
- 1996
- Reference Type:
- publication
- Title:
- Unnamed
- Year:
- 2 001
- Report date:
- 2001
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- EPA OTS 798.2450 (90-Day Inhalation Toxicity)
- Deviations:
- no
- GLP compliance:
- yes
- Limit test:
- no
Test material
- Reference substance name:
- N-butyl acetate
- EC Number:
- 204-658-1
- EC Name:
- N-butyl acetate
- Cas Number:
- 123-86-4
- Molecular formula:
- C6H12O2
- IUPAC Name:
- butyl acetate
- Test material form:
- liquid
- Details on test material:
- - Name of test material (as cited in study report): n-butyl acetate
- Physical state: clear liquid
- Analytical purity: >/= 99.9%
- Laboratory Project ID: 940305I7
- Purity test date: 1994-09-09
- Lot/batch No.: 4014967 and 4010784
Constituent 1
Test animals
- Species:
- rat
- Strain:
- Sprague-Dawley
- Sex:
- male/female
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Source: Charles River Kingston (Stone ridge, NY)
- Age at study initiation: 60 days
- Weight at study initiation: 271 +/- 7 g (males); 215 +/- 8 g (females)
- Fasting period before study: no
- Housing: individually during non expsure periods
- Diet: Certified Rodent Diet (Agway Prolab RMH 3200, ground chow), ad libitum except during exposure
- Water: ad libitum, except during exposure
- Acclimation period: 12 days
ENVIRONMENTAL CONDITIONS
- Temperature: 67-75°F
- Humidity: 46-60%
- Photoperiod (hrs dark / hrs light): 12/12
Administration / exposure
- Route of administration:
- inhalation: vapour
- Type of inhalation exposure:
- whole body
- Vehicle:
- other: unchanged (no vehicle)
- Details on inhalation exposure:
- GENERATION OF TEST ATMOSPHERE / CHAMBER DESCRIPTION
- Exposure apparatus: 4200 L stainless-steel and glass inhalation chambers
- Method of holding animals in test chamber: cages
- System of generating vapour: test substance was metered into glass distillation columns packed with glass beads; filtered, compressed air was passed through the glass bead-packed columns to evaporate the test substance; distillation columns were heated to about 50°C to enhance vaporization; the resultant vapour was directed via glass tubing to a tee just upstream of the inhalation chamber where it was mixed with filtered, conditioned outside air
- Temperature, humidity in air chamber: 21.1-24.7°C; 36.7-68.7%
- Air flow rate: 836 to 965 Lpm
- Air change rate: 12 to 14 air changes per hour
- Method of particle size determination: Micro Laser Particle counter (µLPC-301, Particle Measuring Systems, Inc, Coulder, USA); indicating that an aerosol fo the test subsance was not present
TEST ATMOSPHERE
- Brief description of analytical method used: MIRAN IA infrared gas analyzer (Wilks Foxboro Analytical, South Norwalk, CT) set at a wavelength of 3.38 µM
- Samples taken from breathing zone: no; collection of chamber vapour samples
- Analytical verification of doses or concentrations:
- yes
- Details on analytical verification of doses or concentrations:
- - MIRAN IA infrared gas analyzer (Wilks Foxboro Analytical, South Norwalk, CT) set at a wavelength of 3.38 µM
- chamber vapour samples were continuously collected from each chamber throught TEFLON tubing (3/16" i.d.)
- valve position was pepriodically changed to sample from each chamber at least once each hour - Duration of treatment / exposure:
- 13 weeks
- Frequency of treatment:
- 6 hours per day, 5 days per week
Doses / concentrationsopen allclose all
- Dose / conc.:
- 500 ppm (nominal)
- Dose / conc.:
- 1 500 ppm (nominal)
- Dose / conc.:
- 3 000 ppm (nominal)
- No. of animals per sex per dose:
- 15
- Control animals:
- yes, sham-exposed
- Details on study design:
- - Dose selection rationale: Range finding study: 2-Weeks repeated exposure in which animals were exposed to 0, 750, 1500 or 3000 ppm n-butyl acetate. The test substance produced concentration-related reductions in general activity levels during exposure periods. Animals appeared to acclimate to the 750 and 1500 ppm concentrations but not to 3000 ppm. Mean body weights for the female 1500 ppm animals and for the 3000 ppm male and female animals were lower than the control group on Days 7 and 14, but no statistically significant differences were noted. 3000 ppm was selected as an exposure concentration that would produce overt signs of toxicity, and 500 ppm was selected as an exposure concentration that was expected to have no effect. An exposure concentration of 1500 ppm was selected as the intermediate exposure concentration.
- Positive control:
- none
Examinations
- Observations and examinations performed and frequency:
- CAGE SIDE OBSERVATIONS: Yes
- Time schedule: during exposure and once per day on weekends
- Cage side observations checked were included.
DETAILED CLINICAL OBSERVATIONS: Yes
- Time schedule: before and after exposure
BODY WEIGHT: Yes
- Time schedule for examinations: weekly
FOOD CONSUMPTION: YES
- Time schedule for examinations: weekly
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: No
OPHTHALMOSCOPIC EXAMINATION: Yes
- Time schedule for examinations: prior to the start of the study and during the last week of exposure
- Dose groups that were examined: all animals prior to the start of the study; animals from the control and high-concentration group during the last week of exposure
HAEMATOLOGY: Yes
- Time schedule for collection of blood: day 30 and 90 of the study
- Anaesthetic used for blood collection: Yes (Metofane)
- Animals fasted: Yes
- How many animals: 5 per sex per dose group
- Parameters checked:
Whole blood: hemoglobin concentration, red blood cell count, white blood cell count, hematocrit, red blood cell indices, prothrombin time
Blood smears: cellular morphology and differential white blood cell count
CLINICAL CHEMISTRY: Yes
- Time schedule for collection of blood: day 30 and 90 of the study
- Anaesthetic used for blood collection: Yes (Metofane)
- Animals fasted: Yes
- How many animals: 5 per sex per dose group
- Parameters checked:
Blood serum: aspartate aminotransferase, sorbitol dehydrogenase, alkaline phosphatase, creatinine, albumin, total protein, total bilirubin, alanine aminotransferase, gamma glutamyltranspeptidase, urea nitrogen, glucose, calcium, phosphorus
URINALYSIS: No
NEUROBEHAVIOURAL EXAMINATION: No
OTHER: Organ weights (liver, kidneys, testes or ovaries, spleen adrenal glands, lungs, brain) - Sacrifice and pathology:
- GROSS PATHOLOGY: Yes
HISTOPATHOLOGY: Yes (embedded in paraffin, sectioned at 5 µm and stained with hematoxylin and eosin; nasal passages were decalcified prior to being embedded and sectioned); all tissues (see below) were examined microscopically from the control and high-concentration groups, in addition, the lungs, nasal passages, thymus (males only), stomach (females only), and gross lesions were examined from the mid- and low concentration group
- tissues examined: nasal passages, trachea, larynx, lungs, esophagus, stomach, duodenum, jejunum, ileum, cecum, colon, rectum, heart, aorta, adrenal glands, pituitary gland, thymus, pancreas, urinary bladder, thyroid gland, parathyroid gland, spleen, liver, kidneys, mesenteric lymph nodes, sternum (with bone marrow), right testis, right epididymis, male accessory sex glands, ovaries, vagina, uterus, fallopian tubes, salivary glands, gross lesions - Other examinations:
- - assessment of sperm morphology and development (reported in section 7.8)
- Statistics:
- Bartlett's test, one-way analysis of variance, duncan's multiple range test, Kruskal-Wallis H-test and Mann-Whitney U-test
Results and discussion
Results of examinations
- Clinical signs:
- effects observed, treatment-related
- Mortality:
- mortality observed, treatment-related
- Body weight and weight changes:
- effects observed, treatment-related
- Food consumption and compound intake (if feeding study):
- effects observed, treatment-related
- Food efficiency:
- not specified
- Water consumption and compound intake (if drinking water study):
- not specified
- Ophthalmological findings:
- no effects observed
- Haematological findings:
- effects observed, treatment-related
- Clinical biochemistry findings:
- effects observed, treatment-related
- Urinalysis findings:
- not examined
- Behaviour (functional findings):
- not examined
- Organ weight findings including organ / body weight ratios:
- effects observed, treatment-related
- Gross pathological findings:
- effects observed, treatment-related
- Histopathological findings: non-neoplastic:
- effects observed, treatment-related
- Histopathological findings: neoplastic:
- not examined
- Details on results:
- CLINICAL SIGNS AND MORTALITY
- no spontaneous mortality occurred during the study
3000 ppm group:
- reduced activity levels of generally minor severity during exposure (less movement, decreased alertness, slower response to tapping on the chamber wall)
- Sialorrhea was observed in three animals for no more than one or two exposure days
- red discoloration of the chin hair occurred in several females for no more than one or two exposure days
1500 ppm group:
- reduced activity of generally minimal severity during exposure periods (except the first 5 hours of Day 0 and the first hour or two of Days 1 and 2)
Animals in all groups had prophyrin nasal discharges and dried porphyrin stains around the nose, which occasionally persisted till the next morning. Animals from all groups exhibited discolored-red facial hair, usually the chin hair (slightly higher in the 3000 ppm group than in other groups)
BODY WEIGHT AND WEIGHT GAIN
3000 ppm group:
- significantly reduced mean body weights and body weight gains in males and females; overall weight gains were 62% and 78% of weight gains for the control group (males and females, respectively)
1500 ppm group:
- significantly reduced mean body weights and body weight gains in males and females; overall weight gains were 77% and 70% of weight gains for the control group (males and females, respectively)
500 ppm group:
- body weights and body weight gains were not affected; overall weight gains were 90% and 107% of weight gains for the control group (males and females, respectively)
FOOD CONSUMPTION
3000 ppm group:
- significantly lower than for the control group
- mean weekly feed consumption values were 14-25% or 6-16% lower than the control group in male and female rats, respectively
1500 ppm group:
- significantly lower than for the control group
- mean weekly feed consumption values were 4-17% or 10-15% lower than the control group in male and female rats, respectively
500 ppm group:
- significantly (p = 0.05) lower than for the control group on days 35, 42, 63 and 70 for male rats and on Days 7 and 14 for female rats
- mean weekly feed consumption values were 3-12% lower than the control group in male rats and from 2% higher to 7% lower than the control group for female rats
FOOD EFFICIENCY
- no data
WATER CONSUMPTION
- no data
OPHTHALMOSCOPIC EXAMINATION
- no effects
HAEMATOLOGY
No significant differences in hematologic parameters were seen after 30 days on test. Significantly higher (p = 0.05) mean erythrocyte counts, hemoglobin concentration, and hematocrit values were observed for the 3000 ppm male and female rats after 90 days on test compared with the control groups. The mean eosinophil percentage for male 3000 ppm rats was also significantly higher (p = 0.05) than for the control group. None of the differences were biologically significant, however.
Evaluation of blood cell morphology did not suggest any compound-related effects. After 30 days on test, spherocytosis and poikilocytosis were seen in blood smears of animals from most groups. Increased polychromasia was observed in one male control rat (# 613), while decreased polychromasia was see in two female 3000 ppm rats (# 719 and 720). Howell-Jolly bodies in the blood and anisocytosis were also noted for Rat # 720. After 90 days on test, poikilocytosis was seen in animals from all groups. Anisocytosis was noted in animals from the control, 500, and 1500 ppm groups. Microcytosis was seen in one male 1500 ppm rat (# 632) and in one male 500 ppm rat (#624) and spherocytosis was seen in two male 1500 ppm rats (# 631 and 638).
CLINICAL CHEMISTRY
After 30 days on test, mean sodium concentrations for the male and female 3000 ppm groups were significantly lower (p = 0.05) than for the control group. The differences were slight (about 1 Meq/L), however. The mean chloride concentration for the 1500 ppm male group was significantly lower (p = 0.05) compared with the control group, however, the difference was small ( < 4 Meq/L). No other differences in serum chemistries were seen among groups.
After 90 days on test, mean albumin and total protein concentrations for the 3000 ppm female group were significantly lower (p = 0.05) than for the control group. Mean sorbitol dehydrogenase activity for the 1500 ppm male group was significantly higher than for the control group. These changes were not considered to be toxicologically meaningful, and no other differences in serum chemistry were observed among groups.
URINALYSIS
- not examined
NEUROBEHAVIOUR
- not examined
ORGAN WEIGHTS
Mean terminal body weights measured after exsanguination were significantly lower (p = 0.05) for the 1500 and 3000 ppm male and female groups compared with the control group. Mean absolute weights of the liver, kidneys, and spleen reflect this reduced body weight. Mean absolute liver and spleen weights for the 1500 and 3000 ppm male and female groups were significantly lower (p = 0.05) than for the control groups. Mean absolute
kidney weights for the 1500 female and 3000 ppm male and female groups were also significantly lower (p = 0.05) than for the control groups. However, relative organ weights (to body weight) were not significantly different except for the mean spieen-to-body weight ratio for the 3000 ppm male group which was significantly lower than for the control group. Reduced body weight was also reflected in the significantly lower (p = 0.05) mean absolute brain weight for the 3000 ppm male group and significantly higher (p = 0.05) mean brain-to-body weight for the 1500 ppm female and 3000 ppm male groups compared with their respective control groups. In addition, mean testes-to-body weights for the 1500 and 3000 ppm male groups and the mean relative (to body weight) lung weight for the 3000 ppm male group were significantly higher (p = 0.05) than for the control group. Mean adrenal gland-to-body weight ratios for the 1500 ppm female and 3000 ppm male and female groups were significantly higher (p = 0.05) than for the respective control groups.
GROSS PATHOLOGY
- no exposure related effects were observe in male rats.
- Two females of the 3000 ppm group showed hemorrhage involving the glandular stomach (minimal severity). White discoloration in the non-glandular stomach was also observe for these animals.
- No changes were seen in female rats from the 1500 and 500 ppm groups.
HISTOPATHOLOGY: NON-NEOPLASTIC
- exposure related changes were observed in the nasal passages and stomach of 1500 and 3000 ppm rats
- all male and female 3000 ppm rats and 4/10 male and 6/10 female 1500 ppm rats had necrosis of the olfactory epithelium (mild to moderate for the 3000 ppm group, mild for the 1500 ppm group).
- no lesions were observed in the nasal passages of the 500 ppm group
- 3/10 female rats of the 3000 ppm group had inflammation of the stomach mucosa (glandular or forestomach) of mild to minimal severity; the pathologist concluded that this effect was probably due to stress
- no effects were seen in the low- and mid concentration group
- thymus atrophy was observed in one male of the 3000 ppm group, this lesion was attributed to stress by the pathologist
HISTOPATHOLOGY: NEOPLASTIC (if applicable)
- not examined
OTHER FINDINGS
- No exposure-related effect on epidydimidal or testicular sperm count was observed. Effects on testicular staging or spermatogenic were not evaluated due to the unacceptable condition of tissue.
Effect levels
- Dose descriptor:
- NOAEC
- Effect level:
- 500 ppm
- Based on:
- test mat.
- Remarks:
- n-butyl acetate
- Sex:
- male/female
- Basis for effect level:
- other: see 'Remark'
Target system / organ toxicity
- Critical effects observed:
- not specified
Any other information on results incl. tables
Read-across justification: for details please see read-across report in section 13.
- overall time-weighted average analytical concentrations:
548.4; 1487.5, 3009.6 ppm for males
547.9, 1487.6, 3008.8 ppm for females
- target analytical concentration for the 500 ppm group was increased to 550 ppm to ensure that exposure concentration was at least 500 ppm at all locations of the eposure chamber
Applicant's summary and conclusion
- Conclusions:
- Subchronic exposure of rats to n-butyl acetate vapour resulted in acute, transient signs of reduced activity levels during exposure to 1500 and 3000 ppm. Decreased body weight and feed consumption were noted for the 1500 and 3000 ppm groups, but there was no systemic or organ-specific toxicity. Signs of upper respiratory tract irritation were seen in the nasal passages of 1500 and 3000 ppm animals, but there was no evidence of pulmonary toxicity. The no-observed-adverse-effect concentration (NOAEC) for this study is considered to be 500 ppm (2.4 mg/L).
- Executive summary:
Male and female Sprague-Dawley rats (15 animals/sex/dose group) were exposed to nominal concentrations of 0, 500, 1500 or 3000 ppm of n-butyl acetate for 6 hours per day, 5 days per week for 13 consecutive weeks. The time-weighted average analytical concentrations were within 10% of the target concentrations. Transient signs of sedation were observed during exposure to the 1500 and 3000 ppm concentrations. Body weights were significantly reduced in the mid and high concentration groups. Feed consumption was significantly lower in the 1500 and 3000 ppm group in comparison to the control group. Organ weights affected: weights of liver, kidneys and spleen were significantly lower for the males of the highest concentration goup. Testes and adrenal gland weights for the mid and high concentration groups and the lung weights for the 3000 ppm males were significantly higher than for the control group. Additionally, effects on the stomach (probably stress related) and pulmonary system were observed: Females of the highest concentration group showed signs of irritation of the glandular stomach and necrosis in the non-glandular stomach. Some rats of the 1500 and 3000 ppm group showed degeneration of the olfactory epithelium along the dorsal medial meatus and ethomtubinates of the nasal passages. The severity was mild to moderate for the 3000 ppm group and minimal to mild for the 1500 ppm group. There was no systemic, organ specific toxicity. The no-observed-adverse-effect concentration (NOAEC) for this study is 500 ppm (2.4 mg/L) (Bernard and David, 1996; David et al., 2001).
The study is reliable with restriction (RL2) as maximum reliability for read across from supporting substances is 2.
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