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Environmental fate & pathways

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Alkylated naphthalene, EC Number 700-826-8, is a close structural analog of the Alkylnaphthalene being assessed in this dossier. The substances have similar chemical and physical properites and therefore the biodegradation testing for Alkylated naphthalene, EC Number 700-826-8 can be used as read-across to the alkylnaphthalene in this dossier.

Alkylated Naphthalene was not readily biodegradable under the conditions of the modified Sturm test (OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution). The substance biodegraded 1 - 2% in 28 days. A study was also conducted to determine inherent biodegradability with Alkylated naphthalene. The study was performed according to the modified test method based on the OECD guideline No. 310, 2006. The relative biodegradation values calculated from the measurements performed during the test period revealed no significant biodegradation of Alkylated naphthalene. Thus, Alkylated naphthalene is designated as not inherently biodegradable.

A substance with same EC number (410-190-0) identified during the Inquiry Process reported a ready biodegradation study.

This study also demonstrated that the substance is not readily biodegradable.

Based on the information from the two ready biodegradation studies (28 d degradation: <10%) described above and an inherent biodegradation test (56 d degradation: 4.4 %) with the analog Alkylated naphthalene and, in view of the very low water solubility (<2.0 µg/l), it is unlikely hydrolyze in the environment. It is therefore assumed that the test substance is persistent in the environment as no biotic degradation was observed. Further biodegradation testing would probably come to the same results. As the chemical safety assessment does not indicate a hazard for the environment, further simulation tests are neither necessary nor helpful.