Agron. Sustain. Dev.
Volume 25, Number 2, April-June 2005
Page(s) 331 - 334
Agron. Sustain. Dev. 25 (2005) 331-334
DOI: 10.1051/agro:2005007

Degradation of alloxydim in chlorinated water

Pilar sandín-España, Inés Santín, José Oriol Magrans, José Luis Alonso-prados and José María García-baudín

Departamento de Protección Vegetal, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Ctra. de la Coruña, Km 7.5, 28040 Madrid, Spain

(Accepted 17 January 2005)

Abstract - One of the most common disinfectant agents used for water disinfection, sodium hypochlorite, was employed to investigate the degradation of the herbicide alloxydim. The half-life of alloxydim in the presence of a chlorine excess was determined to be DT50 < 30 s. Degradation of alloxydim in chlorinated water gave rise to a main chlorinated by-product identified by using liquid chromatography (LC) coupled with mass spectrometry (MS). This by-product was produced from the parent compound in amounts that allowed the study of its phytotoxicity on wheat. Bioassays showed that the metabolite had an effect on the root growth with doses from 0.1 mg·L-1.

Key words: by-product / chlorination / bioassay / phytotoxicity / degradation

Corresponding author: José María García-baudín

© INRA, EDP Sciences 2005