Registration Dossier

Administrative data

Endpoint:
Henry's law constant
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
key study
Study period:
from 14 June 1993 to 27 May 1994
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1994
Report Date:
1994

Materials and methods

Principles of method if other than guideline:
An estimation of the Henry's Law Constant for atrazine was obtained by calculation.
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Batch n. C103330. CH20512
Purity: 99.9%
Expiry May 1996
Appaerance: white powder
Storage conditions: room temperature

Results and discussion

Henry's Law constant H
H:
< 0 dimensionless
Temp.:
25 °C
Atm. press.:
1 atm

Any other information on results incl. tables

The unitless Henry's Law Constant for atrazine was calculated as 1.829 x 10^-7 at 25°C which can also be represented as 4.473 x 10^-9 atm. m3mole^-1. The logarithm to base 10 of the reciprocal of this number was also provided (6.738). This would indicate that atrazine does not readily partition from water into air. . The reference compound, 2-ethyl pyrazine, yielded a Henrys Law Constant identical to that quoted in the supplied data set, showing that the program was working correctly

Applicant's summary and conclusion