Substance Identity
CAS Number 79-29-8
Chemical Name Butane, 2,3-dimethyl-
Type of substance Organic
SMILES C(C(C)C)(C)C
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 Category
Bioaccumulative (B)? No
Rational for B Category
Inherently Toxic to Aquatic Organisms (iT)? No
Rational for iT Category
DSL Quantity range (tonnes/year) >1T to 1000T

Ecological data supporting decisions

Underlying data regarding persistence

Media of concern leading to Categorization Air
Experimental Biodegradation half-life (days) Not Available
Predicted Ultimate degradation half-life (days) 15
MITI probability of biodegradation 0.479
TOPKAT probability of biodegradation 0.99
EPI Predicted Ozone reaction half-life (days) 999
Experimental Atmospheric Oxidation half-life (days) 1.72491039426523
Reference (oxidation) ATKINSON,R.; KINETICS AND MECHANISMS OF THE GAS-PHASE REACTIONS OF THE HYDROXYL RADICAL WITH ORGANIC COMPOUNDS.; JOURNAL OF PHYSICAL AND CHEMICAL REFERENCE DATA. MONOGRAPH NO. 1.; 1989
Robust Study Summary (oxidation)
79298.doc
EPI Predicted Atmospheric Oxidation half-life (days) 1.966

Underlying data regarding Bioaccumulation

Empirical Log Kow 3.42
Log Kow predicted by KowWin 3.14
Log BAF T2MTL predicted by Gobas 2.24397149191117
Log BCF 5% T2LTL predicted by Gobas 2.12982613421078
Log BCF Max predicted by OASIS 2.51977459436178
Log BCF predicted by BCFWIN 1.933

Underlying data regarding inherent toxicity to aquatic organisms

Pivotal value for iT (mg/l) 19.9
Toxicity to fathead minnow (LC50 in mg/l) as predicted by Topkat v6.1 19.9
Toxicity to fish (LC50 in mg/l) as predicted by Ecosar v0.99g 5.418
Toxicity to fish (LC50 in mg/l) as predicted by Oasis Forecast M v1.10 36.5588
Toxicity to fish (LC50 in mg/l) as predicted by Aster 2.473377
Toxicity to fish (LC50 in mg/l) as predicted by PNN 15.21067
Toxicity to daphnia (EC50 in mg/l) as predicted by Topkat v6.1 144.5
Toxicity to fish, daphnia, algae or mysid shrimp (EC50 or LC50 in mg/l) as predicted by Ecosar v0.99g 0.692
Chronic toxicity to daphnia or algae (EC50 in mg/l) as predicted by Ecosar v0.99g 0.53
Toxicity to fish (LC50 in mg/l) as predicted by Neutral Organics QSAR in Ecosar v0.99g 5.42E+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