Atrazine

Henry's Law constant

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

Test material information

Constituent 1

Reference substance name:

Atrazine

EC Number:

217-617-8

EC Name:

Atrazine

Cas Number:

1912-24-9

Molecular formula:

C8H14ClN5

IUPAC Name:

6-chloro-N2-ethyl-N4-(propan-2-yl)-1,3,5-triazine-2,4-diamine

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