Calcium 3-hydroxy-4-[(4-methyl-2-sulphonatophenyl)azo]-2-naphthoate

Toxicity to microorganisms

Link to relevant study record(s)

Reference

Endpoint:

toxicity to microorganisms, other

Type of information:

read-across based on grouping of substances (category approach)

Adequacy of study:

key study

Justification for type of information:

Please see the category read-across justification in the category object.

Key result

Duration:

3 h

Dose descriptor:

NOEC

Effect conc.:

100 mg/L

Remarks on result:

other: no effects were seen up to >100 mg/L in studies performed with different category members.

Description of key information

The inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriate low concentrations.

Additional information

The toxicity to aquatic microorganisms is assessed based on a category approach. The category members are composed of a structurally analogue organic part but different metals that are laked with the organic structure. At environmentally relevant pH values disintegration of the molucule and a release of the metal component is not expected. Therefore an influence of the laked metal part is not expected. Aquatic microorganisms toxicity data are available for different members of the category. The lowest effect value is a NOEC of 100 mg/L from a respiration inhibition test with activated sludge from a domestic source.