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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Ecotoxicological Summary

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Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.113 mg/L
Assessment factor:
1 000
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
1.132 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.011 mg/L
Assessment factor:
10 000
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
1.76 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
72 054.279 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
72 054.279 mg/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:
34 499.718 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

No 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 Disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate for effects in the environment

Three major guideline- studies (Klimisch 2) are available for disodium 6-hydroxy-5-[(4-sulphonatophenyl) azo]naphthalene-2-sulphonate , which show no adverse effect on three key trophic levels (fish, invertebrates and algae) when exposed to the substance at concentrations up to its limit of solubility in the respective test media. The value (algae) is LC 50 – 113.2 mg/L which has been used for further calculation.

In determining the classification appropriate to disodium 6-hydroxy-5-[(4-sulphonatophenyl) azo] naphthalene-2-sulphonate , it is necessary to consider all available evidence concerning its persistence, potential to accumulate and predicted or observed environmental fate and behaviour 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 disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo] naphthalene-2-sulphonate is non persistent in nature and so can be considered as biodegradable in the environment. In other words disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate may therefore be expected to degrade rapidly. Thus it can be inferred that disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate is non-persistent.

 Disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate is non persistent and therefore does not satisfy the criteria for classification as persistent (P). 

 

Potential to accumulate.

The predicted and measured log Kow values for disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo] naphthalene-2-sulphonate are less than 3.0 (measured value = - 0.244). The potential for disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate to bioaccumulate in the tissues of organisms that inhabit aquatic or terrestrial environment is therefore negligible.  

The calculated BCF of disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate is 3.2 L/kg wet weight and below the threshold of 2000. 

Disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate does not satisfy the criterion for classification as bioaccumulative (B).

 

The short-term toxicity values for fish, freshwater algae and invertebrates do not show any toxic effect which can fall within the criteria for classification.

Disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate does not satisfy the environmental effects criterion for classification as toxic (T) in case of invertebrates.

Disodium 6-hydroxy-5-[(4-sulphonatophenyl)azo]naphthalene-2-sulphonate is therefore not a P, T & B (or vPvB) substance.