## Registration Dossier

Environmental fate & pathways

## Henry's Law constant

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Endpoint:
Henry's law constant
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
supporting study
Reliability:
2 (reliable with restrictions)

Reference Type:
study report
Title:
Unnamed
Year:
1985

### Materials and methods

Principles of method if other than guideline:
No method detailed, supporting study

Name:
Unnamed
Type:
Constituent

### Results and discussion

##### Henry's Law constant H
H:
ca. 70 928 Pa m³/mol
Temp.:
25 °C
Remarks on result:
other: Calculated from dimensionless Henry coefficient of about 30
H:
ca. 81 060 Pa m³/mol
Temp.:
25 °C
Remarks on result:
other: Calculated from solubility and vapor pressure

### Applicant's summary and conclusion

Conclusions:
The US EPA gives a dimensionless Henry's law constant (Cgas/Cwater) of approx 30 at 25°C. This equates to ca. 70928 Pa m³/mol using a calculation based on measurements of the phase equilibrium for water in gas concentrations of TEL over a temperature range 0 -37.5°C. At 25°C the gas in water ration is approx 30:1. An estimate of the Henry's Law constant via the water solubility (0.21 ppm) and the vapour pressure (0.38 mm Hg) at 25°C gives a similar value of ca.81060 Pa m³/mol
Executive summary:

The US EPA gives a dimensionless Henry's law constant (Cgas/Cwater) of approx 30 at 25°C. This equates to ca. 70928 Pa m³/mol using a calculation based on measurements of the phase equilibrium for water in gas concentrations of TEL over a temperature range 0 -37.5°C. At 25°C the gas in water ration is approx 30:1. An estimate of the Henry's Law constant via the water solubility (0.21 ppm) and the vapour pressure (0.38 mm Hg) at 25°C gives a similar value of ca.81060 Pa m³/mol