Registration Dossier
Registration Dossier
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EC number: 225-443-9 | CAS number: 4851-50-7
Endpoint summary
Administrative data
Description of key information
Hydrolysis:
In accordance with REACH Annex VIII column 2, the study does not need to be conducted if the substance is highly insoluble in water.
Biodegradation in water:
The study conducted in accordance with the Method C.4-D “Manometric Respirometry Test“(2008) (similar to OECD Guideline 301 F) measured a degradation rate of 0 % of Solvent Green 28 within 28 days (Neuhahn, 2017). C.I Solvent Green 28 is considered to be "Not Readily Biodegradable".
Based on the mineralization data, C.I Solvent Green 28 is not inherently biodegradable under the conditions of the OECD guideline no. 302 (Haener, 2003), since less than 20 % degradation (mineralization) was attained after 28 days of contact time. However, based on DOC measurements C.I Solvent Green 28 was completely eliminated.
Biodegradation in water, sediment and soil:
According to the REACH Annex XIII Section 2.1, further biotic degradation testing in appropriate compartment shall be performed to investigate further the degradation of the substance and its degradation product to conclude on the persistency of the tested substance. Based on the profile of the substances of the category, an integrated testing strategy has been developped to assess the persistency of the tested substance. Simulation testing on ultimate degradation in surface water is not considered as scientifically relevant. It is proposed to start simulation testing in soil compartment with an OECD Test Guideline 307 on C.I Solvent Green 28 (CAS n°4851-50-7)(OECD-TG 307 Testing Proposal, 2022). Depending on the outcome of the soil assessment, sediment simulation (OECD TG 308) testing would be considered at a later stage. Further simulation test would not be conducted if the substance is classified as persistent in soil.
Bioaccumulation:
A low potential of bioaccumulation of C.I. Solvent Green 28 is expected based on the high log Kow value (>10), Dmax value higher than 1.7 nm and BCF value estimated to be 53 L/kg wet-wt (BCFBAF model - EPI-Suite Program).
Adsorption:
As the adsorption coefficient (logKoc) of C.I. Solvent Green 28 is 8.0 (Allmending, 2017), the result indicates that the substance is immobile in soils according to McCall et al. (1981).
McCall P.J., Laskowski D.A., Swann R.L., and Dishburger H.J., (1981), “Measurement of sorption coefficients of organic chemicals and their use, in environmental fate analysis”, in Test Protocols for Environmental Fate and Movement of Toxicants. Proceedings of AOAC Symposium, AOAC,Washington DC.
Henry's Law constant: Data is neither required nor available.
Additional information
Category approach:
LANXESS Deutschland GmbH has registered five mono-constituent anthraquinone dyes of similar chemical structure using a category approach: Solvent Violet 36 (CAS No 82-16-6), Solvent Green 28 (CAS No 4851-50-7), Reinblau RLW (CAS No 41611-76-1), Reinblau BLW (CAS No 32724-62-2) and Solvent Green 3 (CAS No 128-80-3). Additional data were taken from another registered anthraquinone dye, Solvent Blue 104 (CAS 116 -75 -6), leading to a category consisting of six members (see attached justification in IUCLID chapter 13). The category consists of substances all having the diamino-anthraquinone structure as a common moiety which is linked to phenyl groups via the amino groups. Differences within the category are described by various alkyl groups bound to the phenyl groups. All substances included in the category approach are poorly water soluble with high adsorption coefficient (log Koc>6), high partition coefficient (logKow>8) and not readily biodegradable.
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