Substance Identity
CAS Number 131-91-9
Chemical Name 2-Naphthalenol, 1-nitroso-
Type of substance Organic
SMILES O=Nc(c(c(ccc1)cc2)c1)c2O
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) 0 to 1T

Ecological data supporting decisions

Underlying data regarding persistence

Media of concern leading to Categorization Water-Soil
Experimental Biodegradation half-life (days) Not Available
Predicted Ultimate degradation half-life (days) 15
MITI probability of biodegradation 0.2202
TOPKAT probability of biodegradation 0
EPI Predicted Ozone reaction half-life (days) 999
EPI Predicted Atmospheric Oxidation half-life (days) 0.07901

Underlying data regarding Bioaccumulation

Empirical Log Kow 2.28
Log Kow predicted by KowWin 2.56
Log BAF T2MTL predicted by Gobas 1.11424980861846
Log BCF 5% T2LTL predicted by Gobas 1.02796427834739
Log BCF Max predicted by OASIS 2.05251051576804
Log BCF predicted by BCFWIN 1.056

Underlying data regarding inherent toxicity to aquatic organisms

Pivotal value for iT (mg/l) 19.8
Toxicity to fathead minnow (LC50 in mg/l) as predicted by Topkat v6.1 19.8
Toxicity to fish (LC50 in mg/l) as predicted by Ecosar v0.99g 11.495
Toxicity to fish (LC50 in mg/l) as predicted by Oasis Forecast M v1.10 33.8316
Toxicity to fish (LC50 in mg/l) as predicted by Aster 3.908727
Toxicity to fish (LC50 in mg/l) as predicted by PNN 10.84197
Toxicity to daphnia (EC50 in mg/l) as predicted by Topkat v6.1 0.5228
Toxicity to fish, daphnia, algae or mysid shrimp (EC50 or LC50 in mg/l) as predicted by Ecosar v0.99g 27.471
Toxicity to fish (LC50 in mg/l) as predicted by Neutral Organics QSAR in Ecosar v0.99g 3.82E-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