Substance Identity
CAS Number 123-33-1
Chemical Name 3,6-Pyridazinedione, 1,2-dihydro-
Type of substance Organic
SMILES C1=CC(=O)NNC1(=O)
Moiety of concern organic
Categorization Results

Meets Government of Canada Categorization Criteria? No
Meets Human Health Categorization Criteria? No
Meets Environmental Criteria for Categorization? No
Persistent (P)? No
Rational for P QSAR
Bioaccumulative (B)? No
Rational for B QSAR
Inherently Toxic to Aquatic Organisms (iT)? No
Rational for iT Experiment
DSL Quantity range (tonnes/year) 0 to 1T

Ecological data supporting decisions

Underlying data regarding persistence

Media of concern leading to Categorization Water
Experimental Biodegradation half-life (days) Not Available
Predicted Ultimate degradation half-life (days) 15
MITI probability of biodegradation 0
TOPKAT probability of biodegradation 0.999
EPI Predicted Ozone reaction half-life (days) 6.549
EPI Predicted Atmospheric Oxidation half-life (days) 0.8069

Underlying data regarding Bioaccumulation

Empirical Log Kow -0.84
Log Kow predicted by KowWin -0.89
Log BAF T2MTL predicted by Gobas 0.0000540371955876
Log BCF 5% T2LTL predicted by Gobas 0.0005144646215092
Log BCF Max predicted by OASIS 0.975450807372025
Log BCF predicted by BCFWIN 0.5

Underlying data regarding inherent toxicity to aquatic organisms

Pivotal value for iT (mg/l) 56
Experimental result iT (mg/l) 56
Test species iT (Latin) Oncorhynchus mykiss
Test species iT (Common) Rainbow trout,doldson trout
Final EndPoint iT LC50
Exposure duration iT (hours) 48
Reference iT Int.Pest Control 11(2):29-35 (Author Communication Used)
Robust Study Summary iT
123331-AT-LC50-F-Rashet.doc
123331-AT-LC50-F-rashet-2.doc
Toxicity to fish (LC50 in mg/l) as predicted by Ecosar v0.99g 8.117
Toxicity to fish (LC50 in mg/l) as predicted by Aster 38,494.88
Toxicity to fish (LC50 in mg/l) as predicted by PNN 10,525.51146
Toxicity to fish, daphnia, algae or mysid shrimp (EC50 or LC50 in mg/l) as predicted by Ecosar v0.99g 49,516.672
Toxicity to fish (LC50 in mg/l) as predicted by Neutral Organics QSAR in Ecosar v0.99g 4.33E+002

Human Health data supporting decisions
Underlying data regarding potential for exposure

LPE/IPE/GPE Lowest Potential for Exposure (HC Simple Exposure Tool)

Underlying data regarding Previous Assessments

Underlying data regarding Simple Hazard Assessment


Underlying data regarding Complex Hazard Assessment