Registration Dossier
Registration Dossier
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reaction mass of: pentasodium 4-amino-5-hydroxy-3-{(E)-4-[2-(sulfonatooxy)ethylsulfonyl]phenylazo}-6-{(E)-2-sulfonato-4-[2-(sulfonatooxy)ethylsulfonyl]phenylazo}naphthalene-2,7-disulfonate;tetrasodium 4-amino-5-hydroxy-3-{(E)-4-[2-(sulfonatooxy)ethylsulfonyl]phenylazo}-6-[(E)-2-sulfonato-4-(vinylsulfonyl)phenylazo]naphthalene-2,7-disulfonate;tetrasodium 4-amino-5-hydroxy-6-[(E)-2-sulfonato-4-[2-(sulfonatooxy)ethylsulfonyl]phenylazo}-3-[(E)-4-(vinylsulfonyl)phenylazo]naphthalene-2,7-disulfonate;trisodium 4-amino-5-hydroxy-3-[(2-hydroxyethylsulfonyl)-phenylazo]-6-[(E)-2-sulfonato-4-(vinylsulfonyl)phenylazo]naphthalene-2,7-disulfonate;trisodium 4-amino-5-hydroxy-3-[(E)-4-(vinylsulfonyl)phenylazo]-6-[(E)-2-sulfonato-4-(vinylsulfonyl)phenylazo]naphthalene-2,7-disulfonate;trisodium 4-amino-5-hydroxy-3-[(E)-4-(vinylsulfonyl)phenylazo]-6-[-2-sulfonato-4-(2-hydroxyethylsulfonyl)phenylazo]naphthalene-2,7-disulfonate
EC number: 445-280-9 | CAS number: 371921-40-3
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
EC50 (3h) > 1100 mg/L nominal concentration
Key value for chemical safety assessment
- EC50 for microorganisms:
- 1 100 mg/L
Additional information
The inhibitory effect of the test item Navy MGi 1571 on the respiration rate of aerobic wastewater microorganisms of activated sludge was investigated in a 3 hour respiration inhibition test according to the OECD Guideline No. 209.
The following nominal concentrations of Navy MGi 1571 were tested: 11, 34, 110, 340 and 1100 mg/L lcorresponding to 10, 32, 100, 320, and 1000 mg/L without water content; the test concentrations were corrected for the water content of the test item of 10 %).
Concentrations exceeding 1100 mg/L were not tested.
ln addition, two controls and three different concentrations of the reference item 3,5-dichlorophenol (5, 16 and 50 mg/L) were tested in parallel. The results of these treatments confirmed the suitability of the activated sludge and the method used. Up to and including the concentration of 340 mg/L the test item Navy MGi 1571 had no siinificant inhibitóry effect (<15 %) on the respiration rate of activated sludge after the inðubation period of three hours. At the highest test item concentrations of 1100 mg/L the inhibitory effect was 15.9 %.
The calculated 3-hour EC-values and their 95% confidence limits were as follows:
NOEC: 929 mg/L
EC50:> 1100 mg/L
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