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Administrative data

Endpoint:
other distribution data
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
other information
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: accepted calculation method

Data source

Reference
Reference Type:
other company data
Title:
Unnamed
Year:
2009
Report date:
2009

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Calculation of volatilization from water according to Thomas RG (1990, Volatilization from water.  In: Handbook of Chemical Property Estimation Methods.  Lyman, W.J. et al. (eds), Washington, DC: American Chemical Society,  Chapter 15) based on a measured HLC (Khan and Brimblecombe 1992, see Chapt. 5.4.2)
Type of study:
other: calculation method
Media:
water - air

Test material

Constituent 1
Chemical structure
Reference substance name:
Butyric acid
EC Number:
203-532-3
EC Name:
Butyric acid
Cas Number:
107-92-6
Molecular formula:
C4H8O2
IUPAC Name:
butyric acid
Details on test material:
- Name of test material (as cited in study report): Butanoic acid

Results and discussion

Any other information on results incl. tables

Henry's Law Constant (HLC) at 25°C: 5.35E-07 atm*m³/mol = 0.0542 Pa*m³/mol (exp. value from US EPA/SRC database: Butler JVA and Ramchandani CN, 1935)

 

Using this HLC and the conditions indicated below the following half-lives for volatilization from rivers and lakes were calculated:

 

 

River

Lake

Water depth [m]

1

1

Wind velocity [m/sec]

5

0.5

Current velocity [m/sec]

1

0.05

Half-Life [hr]

1028 

11,300 

Half-Life [d]

42.84 

470.6 

Half-Life [y]

 

1.29 

Applicant's summary and conclusion

Conclusions:
An experimental Henry's Law Constant (HLC) of 0.0542 Pa*m³/mol at 25 °C was reported from the EPIWIN database. Taking this value, butyric acid volatilization half-lives of 43 and 471 days were estimated for a model river and a model lake, respectively.

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