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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Toxicity to microorganisms

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Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

Additional information

To assess the possible impact of substances of the Diarylide Yellow Pigments on sewage treatment plant microbial activity, a reliable Activated Sludge Respiration Inhibition Test for Pigment Yellow 13 is available (reliability category 2). At a pigment concentration far above the solubility limit, no respiration inhibition was observed (≥80% of the control). This is supported by a non-guideline study which focussed on possible long term microbial degradation of Pigment Yellow 13. By light microscopy different microorganisms growing on the particle surface could be detected, arguing against microbial toxicity of the pigment.

Judging from these experimental results, Diarylide Yellow Pigments are nontoxic to sewage treatment plant microorganisms.