Name: Cyclohexylbenzene
CAS Number: 827-52-1
UN Number: 3295
Formulae: C12H16
Name: Cyclohexylbenzene
CAS Number: 827-52-1
UN Number: 3295
Formulae: C12H16
Physicochemical properties/Characteristics
-
F
Physical behaviour (GESAMP, 2016)
1, 2 -
160.26
Molecular Weight
2
(g/mol) -
0.94
Density
2
(kg/L) -
0.0053
Vapour pressure
2
(KPa; 25ºC) -
5
Water solubility
2
(mg/L; 25ºC) -
2
Dynamic viscosity
2, 3
(mPa.s; 38ºC) -
7.3
Melting point (ºC)
2 -
240.1
Boiling point (ºC)
2 -
5.2
Volatilization half-life (days)
4
- G: gas; D: dissolver; E: evaporator; F: floater; S: sinker; GD: gas/dissolver; DE: dissolver/evaporator; FD: floater/dissolver; FE: floater/evaporator; FED: floater/evaporator/dissolver; Fp: persistent floater; SD: sinker/dissolver
- Values collected from the literature and public databases e.g. PubChem
- “-“ corresponds to values not found
- Values estimated with models of the EPI suiteTM
Fugacity/Persistence
-
3.66
Air
4, 5 -
83.20
Water
4, 5 -
0.07
Soil
4, 5 -
13.10
Sediment
4, 5 -
9.8
Persistence (days)
4
- Values estimated with models of the EPI suiteTM
- In the present study, only emissions in water were considered
Physicochemical degradation/Biodegradation
-
8.8
Atmosferic Oxidation (hours)
4 -
-
Biodegradation rate (GESAMP, 2016)
6, 7 -
0.49
Aerobic biodegradation probability
4 -
3.55 days-weeks
Primary aerobic biodegradation half-life
4, 8 -
2.79 weeks
Ultimate aerobic biodegradation half-life
4, 8 -
46.2
Hydrocarbon Biodegradation half-life (days)
3, 4 -
0.10
Anaerobic Biodegradation probability
4
- “-“ corresponds to values not found
- Values estimated with models of the EPI suiteTM
- Results obtained from the literature
- GESAMP criteria consider substances to be “readily biodegradable” (R) if, in 28-day biodegradation studies, the following levels of degradation are achieved: in tests based upon dissolved organic carbon (DOC) die-away: ≥ 70%; or in tests based upon oxygen depletion or carbon dioxide generation: ≥ 60% of the theoretical maxima; or where only chemical oxygen demand (COD) and biochemical oxygen demand (BOD5) data are available, the ratio of BOD5/COD ≥ 0.5; or where other convincing scientific evidence is available to demonstrate that the substance can be degraded (biotically and/or abiotically) in the aquatic environment to a level of > 70% within a 28-day period. Otherwise they are “not readily biodegradable” (NR) (GESAMP, 2014).
- See Table 1 in the supplementary material for more information on the rating reported by Boethling et al. (1994)
Bioaccumulation/Biotransformation
-
1.07
Biotransformation half-life (days)
2 -
4.81
Partition coefficient (log Kow)
2 -
416.8
Bioconcentration factor (BFC)
4 -
-
Bioaccumulation rate (GESAMP, 2016)
9 -
3.94
Adsorption coefficient (log koc)
2
- Values collected from the literature and public databases e.g. PubChem
- Values estimated with models of the EPI suiteTM
- See Table 2 in the supplementary material for more information on Bioaccumulation rate classification (GESAMP, 2014)
Aquatic Toxicity
-
-
Acute toxicity (GESAMP, 2016)
10 -
-
Chronic toxicity (GESAMP, 2016)
3, 10
- “-“ corresponds to values not found
- See Table 3 in the supplementary material for more information on Aquatic Toxicity classification (GESAMP, 2014)
Acute Mammals/Human health effects
-
-
Oral Toxicity (GESAMP, 2016)
11 -
-
Dermal toxicity (GESAMP, 2016)
11 -
-
Inhalation toxicity (GESAMP, 2016)
11 -
-
Skin irritation & corrosion (GESAMP, 2016)
11 -
-
Eye irritation & corrosion (GESAMP, 2016)
11 -
-
Toxicity
12 -
-
Severity
12
- See Table 4 in the supplementary material for more information on Human health (Toxic effects to mammals) classification (GESAMP, 2014)
- For more information on Toxicity and Severity scores consult Harold et al. (2014)
Chronic Human/Mammals health effects
-
-
Carcinogenicity (IARC)
3, 13 -
No
Mutagenicity (GESAMP, 2016)
11 -
No
Reprotoxicity (GESAMP, 2016)
11 -
No
Sensitizing to skin (GESAMP, 2016)
11 -
No
Aspiration hazard (GESAMP, 2016)
11 -
No
Target Organ Toxicity (GESAMP, 2016)
11 -
No
Sensitizing to respiratory system (GESAMP, 2016)
11 -
No
Neurotoxicity (GESAMP, 2016)
11 -
No
Immunotoxicity (GESAMP, 2016)
11
- “-“ corresponds to values not found
- See Table 4 in the supplementary material for more information on Human health (Toxic effects to mammals) classification (GESAMP, 2014)
- See Table 5 in the supplementary material for more information on IARC classification
Toxicity tests results
PNECseawater:
0.02 µg/L
PNECwater, intermittent:
0.56 µg/L
Algae
-
EC50
Parameter
1 -
0.632
Concentration
(mg/L) -
Green algae
Species
-
-
Endpoint
-
Freshwater; 96h-exposure
Observations
1
-
MATC
Parameter
1 -
0.295
Concentration
(mg/L) -
Green algae
Species
-
-
Endpoint
-
Freshwater
Observations
2
- Values predicted with ECOSAR V1.11 (EPA) (accessed February 7, 2017)
Invertebrates
-
LC50
Parameter
1 -
0.290
Concentration
(mg/L) -
Daphnids
Species
-
Mortality
Endpoint
-
Freshwater; 48h-exposure
Observations
3
-
LC50
Parameter
1 -
0.056
Concentration
(mg/L) -
Mysid
Species
-
Mortality
Endpoint
-
Saltwater; 96h-exposure
Observations
4
Lowest
-
MATC
Parameter
1 -
0.058
Concentration
(mg/L) -
Daphnids
Species
-
-
Endpoint
-
Freshwater
Observations
5
-
MATC
Parameter
1 -
0.002
Concentration
(mg/L) -
Mysid
Species
-
-
Endpoint
-
Saltwater
Observations
6
Lowest
- Values predicted with ECOSAR V1.11 (EPA) (accessed February 7, 2017)
Fish
-
LC50
Parameter
1 -
0.394
Concentration
(mg/L) -
Fish
Species
-
Mortality
Endpoint
-
Freshwater; 96h-exposure
Observations
7
-
LC50
Parameter
1 -
0.505
Concentration
(mg/L) -
Fish
Species
-
Mortality
Endpoint
-
Saltwater; 96h-exposure
Observations
8
-
MATC
Parameter
1 -
0.052
Concentration
(mg/L) -
Fish
Species
-
-
Endpoint
-
Freshwater
Observations
9
-
MATC
Parameter
1 -
0.305
Concentration
(mg/L) -
Fish
Species
-
-
Endpoint
-
Saltwater
Observations
10
- Values predicted with ECOSAR V1.11 (EPA) (accessed February 7, 2017)
Mammals
-
LD50
Parameter
1 -
67
Concentration
(mg/kg) -
Mouse
Species
-
Mortality
Endpoint
-
Acute; intravenous
Observations
11
-
LD50
Parameter
1 -
248
Concentration
(mg/kg) -
Rat
Species
-
Mortality
Endpoint
-
Acute; intraperitoneal
Observations
12
-
LD50
Parameter
2 -
7940
Concentration
(mg/kg) -
Rabbit
Species
-
Mortality
Endpoint
-
Acute; dermal
Observations
13
- ChemSpider; Cyclohexylbenzene (2015). Available at: http://www.chemspider.com/Chemical-Structure.12674.html (accessed November 9, 2015)
- Acros organics; Safety data sheet (2009). Available at: https://www.fishersci.com/shop/msdsproxy?productName=AC111295000&productDescription=CYCLOHEXYLBENZENE%2C+96%25+500ML&catNo=AC111295000&vendorId=VN00032119&storeId=10652 (accessed November 9, 2015)
Note: Cyclohexylbenzene is not present on GESAMP's list
References
Boethling RS, Howard PH, Meylan W, Stiteler W, Beauman J, Tirado N. 1994. Group contribution method for predicting probability and rate of aerobic biodegradation. Environ. Sci. Technol. 28: 459-465.
Bonn Agreement, 1994. European Classification System, Bonn Agreement: Counter-Pollution Manual. Bonn Agreement, London (Chapter 25).
GESAMP (IMO/FAO/UNESCO-IOC/WMO/WHO/IAEA/UN/UNEP Joint Group of Experts on the Scientific Aspects of Marine Environmental Protection), 2014. Revised GESAMP Hazard Evaluation Procedure for Chemical Substances Carried by Ships, 2nd edition. Rep. Stud. GESAMP No. 64, 126 pp.
GESAMP Composite List, 2016. ANNEX 5 – UPDATED GESAMP COMPOSITE LIST. Available at: https://edocs.imo.org/Final Documents/English/PPR 1-CIRC.3 (E).docx (Accessed: December 12, 2016).
Harold PD, Souza AS, Louchart P, Russell D, Brunt H, 2014. Development of a risk based prioritisation methodology to inform public health emergency planning and preparedness in case of accidental spill at sea of hazardous and noxious substances (HNS). Environ. Int. 72: 157-163.