Registration Dossier
Registration Dossier
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EC number: 404-240-0 | CAS number: 95962-14-4 NECTALACTONE; NECTARYL; NECTARYL-LRG 1371
Endpoint summary
Administrative data
Description of key information
In an OECD 301F ready biodegradability study, Nectaryl did not inhibit the intrinsic respiration of the inoculum at the test concentration and was therefore considered to be non-toxic to the inoculum at the test concentration.
Nectaryl undergoes 66% biodegradation after 28 days in the test conditions. The 10-day window criterion is not fulfilled (20% biodegradation on day 11 and 52% on day 21). The 10-day time window criterion was developed on the assumption that a test substance is degraded according to a “standard” growth curve in ready biodegradability tests. The OECD Guidelines for Testing of Chemicals, Section 3. Part 1: Principles and strategies related to the testing of degradation of organic chemicals (adopted 23 March 2006), states that if a substance consists of “constituents with different chain-lengths, degree and/or site of branching or stereo-isomers, even in their most purified commercial forms” and “it is anticipated that a sequential biodegradation of the individual structures is taking place, then the 10-day window should not be applied to interpret the results of the test.” The 10-day time-window should therefore not be applied as a pass / fail criterion for Nectaryl, which is a mixture of four stereoisomers. Thus, Nectaryl should be regarded as readily biodegradable according to this test based on the biodegradation percentage of 66% at day 28.
Additional information
Nectaryl has been determined to be READILY Biodegradable in an OECD 301F biodegradation screening study and, as such, higher-tier environmental fate and metabolism studies are not required.
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