Registration Dossier
Registration Dossier
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Reaction mass of tetrasodium 7,7'-(carbonyldiimino)bis[4-hydroxy-3-[(2-methyl-4-sulphonatophenyl)azo]naphthalene-2-sulphonate] and tetrasodium 4-[[1-hydroxy-6-[[[[5-hydroxy-6-[(2-methyl-4-sulphonatophenyl)azo]-7-sulphonato-2-naphthyl]amino]carbonyl]amino]-3-sulphonato-2-naphthyl]azo]benzoate and tetrasodium 4,4'-[carbonylbis[imino(1-hydroxy-3-sulphonatonaphthalene-6,2-diyl)azo]]dibenzoate
EC number: 942-930-8 | CAS number: -
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
The 3-h EC50 and EC10 valuer are both >900 mg/L (nominal) in activated sludge of a predominantly domestic sewage after correction for the percentage active ingredient in the tested substance.
Key value for chemical safety assessment
Additional information
The toxicity of the substance to microorganisms was investigated in an activated sludge respiration inhibition study according to OECD guideline No 209 and in compliance with GLP criteria (BASF, draft report).
In this study activated sludge from a domestic sewage treatment plant was exposed to nominal test substance concentrations of 0 (control), 62.5, 125, 250, 500 and 1000 mg/L for 3 hours. Test concentrations were not analytically verified. The effects on microorganisms was determined by measuring total respiration rates and comparing these to an unexposed control. No inhibition of respiration rates was observed at any of the concentrations tested. Based on these findings, the 3 -h EC50 and EC10 values were both determined at >1000 mg/L. Based on a reported 90% active ingredient in the tested substance, these values are >900 mg/L.
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