Registration Dossier

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The substance and its major environmental metabolite dissipate rapidly from soils following a single application. Cloquintocet-mexyl and its metabolite were non-detectable in groundwater samples taken from below the treatment site.

Additional information

A field study has been carried out, to monitor the impact of cloquintocet-mexyl and its relevant metabolites on shallow groundwaters and adjacent surface waters. The study was GLP-compliant and is considered to be acceptable with restrictions (2) as a field study is specific to the sites studied and weather conditions experienced during the study period.

 The concentrations of cloquintocet-mexyl and its metabolite (5-chloroquinolin-8-yl)oxy]acetic acid were monitored in soil and water samples in a field study at a sandy and clay site. A single application was made in December 1997 at each site and samples were taken at predetermined times or when triggered by rainfall events. Neither cloquintocet-mexyl nor its metabolite were detected above the limit of detection in any water sample taken during the field trial. Both compounds were detected in the soil samples, but only in the samples from 0 - 5 cm depth. Concentrations had fallen to below the limit of detection after 1 month in the clay soil, and after 14 days and 6 months for the parent and metabolite respectively in the sand soil.