Substance Identity
CAS Number 89-25-8
Chemical Name 3H-Pyrazol-3-one, 2,4-dihydro-5-methyl-2-phenyl-
Type of substance Organic
SMILES O=C(N(N=C1C)c(cccc2)c2)C1
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 QSAR
DSL Quantity range (tonnes/year) >1T to 1000T

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 0.1616
EPI Predicted Ozone reaction half-life (days) 999
EPI Predicted Atmospheric Oxidation half-life (days) 0.8143

Underlying data regarding Bioaccumulation

Log Kow predicted by KowWin 2.56
Log BAF T2MTL predicted by Gobas 1.3805084543777
Log BCF 5% T2LTL predicted by Gobas 1.28915192577905
Log BCF Max predicted by OASIS 2.05483480584622
Log BCF predicted by BCFWIN 1.273

Underlying data regarding inherent toxicity to aquatic organisms

Pivotal value for iT (mg/l) 38.838
Toxicity to fish (LC50 in mg/l) as predicted by Ecosar v0.99g 0.389
Toxicity to fish (LC50 in mg/l) as predicted by Oasis Forecast M v1.10 38.838
Toxicity to fish (LC50 in mg/l) as predicted by PNN 372.25984
Toxicity to fish, daphnia, algae or mysid shrimp (EC50 or LC50 in mg/l) as predicted by Ecosar v0.99g 76.085
Toxicity to fish (LC50 in mg/l) as predicted by Neutral Organics QSAR in Ecosar v0.99g 3.84E-001

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