4'-aminoazobenzene-4-sulphonic acid

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

25.5 µg/L

Assessment factor:

50

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

0.5 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

2.55 µg/L

Assessment factor:

500

Extrapolation method:

assessment factor

PNEC marine water (intermittent releases):

50 µg/L

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

50 mg/L

Assessment factor:

10

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

0.755 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

75.5 µg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:

no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:

PNEC soil

PNEC value:

0.136 mg/kg soil dw

Extrapolation method:

equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

no potential for bioaccumulation

Additional information

Classification is not triggered based on available data, according to REGULATION (EC) No 1272/2008 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006.

Conclusion on classification

Classification of 4'-aminoazobenzene-4-sulphonic acid for effects in the environment

In determining the classification appropriate to 4'-aminoazobenzene-4-sulphonic acid, it is necessary to consider all available evidence concerning its persistence, potential to accumulate and predicted or observed environmental fate and behavior that may present a long-term and/or delayed danger to the structure and/or functioning of aquatic ecosystems. These points are considered below.

 

Persistence   

Reliable studies are available to demonstrate that 4'-aminoazobenzene-4-sulphonic acid is non persistent in nature and so is considered to have rapid biodegradation in the environment. In other words, 4'-aminoazobenzene-4-sulphonic acid degradation may therefore be expected to be fast. Thus it can be inferred that 4'-aminoazobenzene-4-sulphonic acid is non persistent in character.   

Thus, 4'-aminoazobenzene-4-sulphonic acid is not classified as a persistent (P) chemical. 

Potential to accumulate

The estimated log Kow values for 4'-aminoazobenzene-4-sulphonic acid is less than 4 (Log Kow = -0.3516). The potential for4'-aminoazobenzene-4-sulphonic acid to bioaccumulate in the tissues of organisms that inhabit aquatic or terrestrial matrices is negligible as the BCF factor for the substance is less than 2000.   

The estimated BCF of 4'-aminoazobenzene-4-sulphonic acid is highest 3.2 dimensionless and below the threshold of 2000. 

Thus, 4'-aminoazobenzene-4-sulphonic acid does not satisfy the criterion for classification as bioaccumulative (B). 

The toxicity values of fish, invertebrates and algae are LC50 = 59.9333 mg/L, EC50 = 34.894 mg/L and EC50 = 13.121 mg/L, respectively. The BCF value of 4'-aminoazobenzene-4-sulphonic acid reported was not >= 500 as well as the substance was found to be rapidly bio-degradable in the water compartment. Thus considering the CLP Criteria for aquatic classification of the substance, it is concluded that 4'-aminoazobenzene-4-sulphonic acid does not exhibits toxicity to aquatic environment.

So, 4'-aminoazobenzene-4-sulphonic acid does not satisfies the environmental effects criterion for classification as toxic (T).

Thus it can be inferred that 4'-aminoazobenzene-4-sulphonic acid is not a PBT (including vPvB) substance.