Registration Dossier
Registration Dossier
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EC number: 272-732-0 | CAS number: 68910-13-4
Toxicity to microorganisms
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.
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