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Improving Member States preparedness to face an HNS pollution of the Marine System (HNS-MS)

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Urea

Description Top

CAS number 57-13-6
Chemical formula CH4N2O
Accident occurred Yes
Standard European Behaviour Classification (SEBC) Dissolves (D)
Abilities Miscible in water.
Notable risks Reacts with some compounds.
GESAMP Hazard profile
A1 A2 B1 B2 C1 C2 C3 D1 D2 D3 E1 E2 E3
0 R 1 NI 0 0 1 1 1 NI D 1

Marine pollution Classification (MARPOL Annex II)
Category Description
Z Noxious Liquid Substances which, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a minor hazard to either marine resources or human health and therefore justify less stringent restrictions on the quality and quantity of the discharge into the marine environment.

Alternate names for this chemical
Amide Of Carbonic Acid
Carbamide
Carbamimidic Acid
Carbonyl Diamide
Carbonyldiamide
Carbonyldiamine
Isourea
Urea
Uree


Physico-chemical properties Top

Chemical formula CH4N2O
Molar mass 60.06 [g/mol]
State Solid at 25°C and 1 atm
Fusion temperature 132.7 [°C]
Density
1320 [Kg/m³] at a temperature of 20°C
Kinematic viscosity
1.49 [cSt] at a temperature of 20°C
Hydrosolubility
1080000 [mg/l] at a temperature of 20°C and salinity of 0‰
1230000 [mg/l] at a temperature of 25°C and salinity of 0‰
Vapour pressure
0 [Pa] at a temperature of 20°C
0 [Pa] at a temperature of 25°C
Vapour density 1.6
Combustion enthalpy 9050000 [J/Kg]
Combustion efficiency 95 [%]
Mass flow rate of the combustion surface 0.01 [Kg/(m²·s)]
Radiative fraction 22 [%]
Henry's constant 0 [mol/(m³·Pa)]


Behaviour Top

Log Kow 0
Log Koc 0.9
Hydrolysis (Half-life) Not hydrolysable
Aqueous photolysis (Half-life) Not photolysable
Biodegradation in estuary environment (Half-life) 15 days
Biodegradation in marine environment (Half-life) 50 days
Standard European Behaviour Classification (SEBC) Dissolves (D)
Bioconcentration factor (BCF) 1.1


Ecotoxicity Top

Lowest median lethal concentration (LC50) on crustacean 3910 [mg/l]
Lowest median lethal concentration (LC50) on fishes 67 [mg/l]
Highest no observed effect concentration (NOEC) on algae 1050 [mg/l]
Assessment factor (AF)
47 on the short-term
Predicted No Effect Concentration (PNEC)
1000 [µg/l] on the short-term


GESAMP Top

GESAMP Hazard profile
A1 A2 B1 B2 C1 C2 C3 D1 D2 D3 E1 E2 E3
0 R 1 NI 0 0 1 1 1 NI D 1

A1: Bioaccumulation
Rating Description
0 No potential to bioaccumulate
A1a:
Rating Description Criteria [mg/l]
0 No potential to bioaccumulate Log Kow < 1
A1b:
Rating Description Criteria
0 No potential to bioaccumulate No measurable bioconcentration factor (BCF)
A2: Biodegradation
Rating Description
R Readily biodegradable
B1: Acute aquatic toxicity
Rating Description Criteria [mg/l]
1 Practically non-toxic 100 < LC/EC/IC50 ≤ 1000
B2: Chronic aquatic toxicity
Rating Description
NI No Information
C1: Acute oral toxicity
Rating Description Criteria [mg/Kg]
0 Negligible AOTE > 2000
C2: Acute dermal toxicity (skin contact)
Rating Description Criteria [mg/Kg]
0 Negligible ADTE > 2000
C3: Acute inhalation toxicity
Rating Description Criteria [mg/l] (4 hours exposure)
1 Slight 10 < AITE ≤ 20
D1: Skin irritation or corrosion
Rating Description Sign GHS category
1 Mildly irritating Mild erythema with or Mild Irritant Category 3
D2: Eye irritation
Rating Description Sign GHS category
1 Mildly irritating Mild conjunctival hype Irritant Category 2B
D3: Long-term health effects
Notation Hazard endpoint Description GHS category
No Information
E1: Tainting of seafood
Rating Description
NI No Information
E2: Behaviour of chemicals in the marine environment
Rating Description
D Dissolves
E3: Interference with the use of coastal amenities
Rating Interference Description Interpretation Warning
1 Slightly objectionable 1 is a floater; and/or 2 is slightly acutely toxic; and/or 3 is mildly irritant to skin and/or eyes 1 E2 = F; and/or 2 C1 and/or C2 and/or C3 = 1; and/or 3 D1 and/or D2 = 1 Warning issued but no closure of amenities

  About the project

HNS-MS is a decision-support tool that Belgian and French maritime authorities as well as coastguard stations can activate in order to forecast the drift, fate and behavior of acute marine pollution by Harmful Noxious Substances (HNS) accidentally released in the marine system.

  Contact us

Web: https://www.hns-ms.eu/

Tel : +32 (0)2 773-2102

Mail : hns-ms@naturalsciences.be

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EU flagHNS-MS has been funded by DG-ECHO under agreement ECHO/SUB/2014/693705 and runs from 1 January 2015 to 31 March 2017.