Registration Dossier

Administrative data

Endpoint:
dissociation constant
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 14 June 1993 to 13 October 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

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 112 (Dissociation Constants in Water)
Deviations:
not specified
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Atrazine (pure grades)
Batch number 744
Purity 99.5%
Expiry: Stable until at least January 2995
Storage 4°C
Appaerance: white powder

Results and discussion

Dissociating properties:
yes
Dissosciation constant
No.:
#1
pKa:
1.56
Temp.:
20 °C
Remarks on result:
other: Overall mean of three tests (see remarks on results).The associated standard deviation was 0.11

Any other information on results incl. tables

The first test, seven pKa values were obtained between 1 .60 and 1 .76 with a mean of 1 .67 and an associated standard deviation of 0.065, For the second test, seven pKa values were obtained between 1.46 and 1 .65 with a mean of 1 .57 and an associated standard deviation of 0.074. For the third test, seven pKa values were obtained between 1.33 and 1.54 with a mean of 1.45 and an associated standard deviation of 0.070.

Applicant's summary and conclusion