Substance Identity
CAS Number 5858-39-9
Chemical Name 1-Naphthalenesulfonic acid, 4-hydroxy-3-[(2-methoxyphenyl)azo]-, monosodium salt
Type of substance Organic
SMILES OS(c1c(cccc3)c3c(c(N=Nc2ccccc2OC)c1)O)(=O)=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)? Yes
Rational for P Category
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) 60
MITI probability of biodegradation 0
EPI Predicted Ozone reaction half-life (days) 999
EPI Predicted Atmospheric Oxidation half-life (days) 0.8099

Underlying data regarding Bioaccumulation

Log Kow predicted by KowWin 0.64
Log BAF T2MTL predicted by Gobas 0.0837054674542801
Log BCF 5% T2LTL predicted by Gobas 0.068783547691588
Log BCF Max predicted by OASIS 1.16934609030203
Log BCF predicted by BCFWIN 0.5

Underlying data regarding inherent toxicity to aquatic organisms

Pivotal value for iT (mg/l) 10.348772
Toxicity to fish (LC50 in mg/l) as predicted by Ecosar v0.99g 286.057
Toxicity to fish (LC50 in mg/l) as predicted by Oasis Forecast M v1.10 1,153.2758
Toxicity to fish (LC50 in mg/l) as predicted by Aster 10.348772
Toxicity to fish (LC50 in mg/l) as predicted by PNN 131.61155
Toxicity to fish, daphnia, algae or mysid shrimp (EC50 or LC50 in mg/l) as predicted by Ecosar v0.99g 203.143
Toxicity to fish (LC50 in mg/l) as predicted by Neutral Organics QSAR in Ecosar v0.99g 1.05E+000

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