Registration Dossier

Diss Factsheets

Environmental fate & pathways

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.

Additional information

Categories Display