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
HYDROLYSIS :
An OECD 111 - Hydrolysis - study has been conducted on Nectaryl.
Nectaryl undergoes negligible hydrolysis at pH7 and pH9 (T1/2 > 1 year at 25 °C), whereas a normal pseudo-1st order hydrolysis reaction occurs at pH4 with a derived half-life time of 210 days at 25 °C.
PHOTOTRANSFORMATION in AIR :
The fate of Nectaryl in the atmospheric compartment has been modelled using the AopWin (v1.92) module of EPISuite (v4.11). The model predicts rapid atmospheric degradation with an atmospheric half-life of 1.171 hours based on reactions with hydroxyl radicals (12-hours of daylight per day), and, 0.64 hours half-life based on interactions with ozone (24-hour day). In addition, AopWin (v1.92) suggests that interactions with Nitrate radicals may well be important as a transformation mechanism.
The AEROWIN model (see EPISuite output attachment predicts a low level of adsorption of the gaseous-phase Nectaryl to aerosol particulates (1.2 to 2.5 % depending on the model), and, thus suggests that the major portion of the airborne Nectaryl will be freely available to undergo gaseous-phase reactions with hydroxyl and ozone radicals.
Long-range atmospheric transport, and subsequent re-deposition, is, therefore, highly unlikely to be of any concern for Nectaryl.
PHOTOTRANSFORMATION in WATER and in SOIL :
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. Additionally, the UV-VIS spectrum of Nectaryl demonstrates a relatively strong absorbing chromophore at 284 nm, which may well promote both direct- and indirect-photolytic degradation.
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