Registration Dossier
Registration Dossier
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Reaction mass of isomers disodium 8-(2-{4-[benzyl(ethyl)amino]-2-methylphenyl}diazen-1-yl)-5-(2-{2,5-dimethyl-4-[2-(3-sulfonatophenyl)diazen-1-yl]phenyl}diazen-1-yl)naphthalene-2-sulfonate, disodium 5-(2-{4-[benzyl(ethyl)amino]-2-methylphenyl}diazen-1-yl)-8-(2-{2,5-dimethyl-4-[2-(3-sulfonatophenyl)diazen-1-yl]phenyl}diazen-1-yl)naphthalene-2-sulfonate
EC number: 700-946-0 | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
No accurate adsorption coefficients KD as well as corresponding organic carbon normalised adsorption coefficients KOC could be derived due to precipitation of the test item in the test system by formation of insoluble salts with high-order cations.
Key value for chemical safety assessment
Additional information
Preliminary investigations about the adsorption behaviour (tier 1) of test item on two different soils were performed.
These investigations indicated that a definitive study following OECD 106 (2000) and Council Regulation (EC) No. 440/2008, C.18 (2001) is not feasible because no adsorption coefficients KD as well as corresponding organic carbon normalised adsorption coefficients KOC could be determined.
The test item is an azo dyestuff, bearing polar sulfonate moieties with sodium as counter ion. For preliminary testing, stock solutions of the test item were prepared in 0.01 M CaCl2-solution. Though the water solubility is high (1 g/L), precipitation of the test item occurred. Based on these observations, demineralised water had to be used for preparation of the stock solution and as aqueous medium for tier 1 testing. The preliminary investigations at a concentration of 1000 µg test item/L and soil / solution ratios of 1:1 and 1:4 for both soils (LUFA soils 2.3 and 2.4) have been conducted using polyethylene (PE) centrifugation tubes. The test item concentration was measured at t0, 4 h, 24 h and 48 h. The concentration measured in test item controls of both soils with a soil / solution ratio of 1:1 showed a decline of the test item in the aqueous phase already at t0 with recoveries of 44% and 41% of the initially applied concentration. In samples taken after 4 h, 24 h and 48 h, measured concentrations were below the lowest calibration standard of 0.200 mg/L.
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