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EC number: 200-864-0 | CAS number: 75-35-4
Henry's Law constant
Administrative data
Link to relevant study record(s)
Description of key information
The HLC of 1,1-dichloroethylene has been calculated according to the equation R16-4 of ECHA guidance.
Key value for chemical safety assessment
- Henry's law constant (H) (in Pa m³/mol):
- 2 572
- at the temperature of:
- 20 °C
Additional information
The Henry's Law constant of 1,1 -dichloroethene has been calculated according to the equation R16 -4 of the guidance on information requirements and chemical safety assessment - chapter R16: environmental exposure assessment (ECHA 2012).
The equation used is the following :
HENRY = ( VP x MOLW ) / SOL
With :
VP = 66340 Pa at 20°C
MOLW = 96.94 g/mol
SOL = 2500 mg/L at 20°C.
The Henry's Law Constant has been calculated to be 2572 Pa.m3/mol (corresponding to 2.5 atm.m3/mol). Therefore, 1,1 -dichloroethylene is considered as highly volatile from water at 20°C.
Published data from handbook and HENRYWIN support this high volatility.
Additionally, data on the half-life of volatilisation of 1,1 -dichloroethene from water support this high HLC value as listed below :
- t1/2 = 27 min at 20°C (Dilling, 1977)
- t1/2 = 1.03h from river and 93.8h from lake (calculation of Episuite)
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