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Environmental Toxicity and Fate Hazard Threshold Values


Environmental Toxicity and Fate Hazard Threshold Values 
DRAFT- NOT FINAL (Jan, 2010)

 

 

Very High (vH)

 

High (H)

 

Moderate (M)

 

 Low (L)

Very Low (vL)

Acute Aquatic Toxicity

96 hr LC50 (fish)        48 hr EC50 (crustacea) 72 or 96 hr ErC50 (algae, aquatic plants)

 

GHS Cat 1

(≤ 1 mg/L)

Specified Lists

 

GHS Cat 2

(>1 to 10 mg/L)

Specified Lists

 

GHS Cat 3

(>10 to 100 mg/L)

Specified Lists

 

 

Not classifiable as GHS Cat 1, 2, or 3 (> 100 mg/L)

 

Chronic Aquatic Toxicity

 

NOEC or EcX

 

≤ 0.1 mg/L

 

> 0.1 to 1.0 mg/L

 

>1.0 to 10 mg/L; or

GHS Cat 4

> 10 mg/L

 

Persistence

 

1/2 Life (soil, sediment) > 180 days; or

1/2 Life (water) > 60 days; or

1/2 Life (air) > 5 days

 

1/2 Life (soil, sediment) >60 to 180 days; or

1/2 Life (water) >40 to 60 days; or

1/2 Life (air) > 2 to 5 days; or

potential for long-range environmental transport 

1/2 Life (soil, sediment) >16 to 60 days; or

1/2 Life (water) >16 to 40 days; or

1/2 Life (air) < 2 days

 

 Low: Meets GHS Definition for Rapid Degradability

Very Low: Meets 10-day window

as measured in a ready biodegradaton test without degradation

products of concern

 

Bioaccumulation Potential

 

BCF/BAF > 5000; or

Log Kow > 5

 

BCF/BAF >1000 to 5000; or

Log Kow > 4.5 to 5

 Weight of evidence for presence in humans and wildlife

BCF/BAF > 500 to 1000; or

Log Kow >4 to 4.5

 Suggestive evidence of presence in humans and wildlife

Low:BCF/BAF > 100 to 500; or  Log Kow<4

Very Low: BCF/BAF

≤ 100
     
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