Sunlight transformation of sethoxydim-lithium in natural waters and effect of humic acids

Degradation of Cyclohexanedione Oxime Herbicides

“…In our research group, different experiments have been carried out to study the photodegradation of sethoxydim in natural waters (mineral, well and river) and under natural and simulated sunlight in order to obtain results close to field conditions [43]. The degradation rates in natural waters were lower than in ultrapure water.…”

Identification of sethoxydim degradation products in natural waters under different light sources by HPLC-QTOF-MS

“…Sethoxydim was rapidly degraded within 36 h and complete mineralization was not achieved [20]. Therefore, in the present work we study the by-products generated in this process.…”

“…Commercial mineral water (FontVella) was purchased from a local supermarket. The physicochemical characteristics of these natural waters were given elsewhere [20].…”

“…Nevertheless, it is known that the presence of natural substances such as humic acids, nitrate and carbonate ions in aqueous systems can exert a great influence on the photodegradation rates of parent herbicide as well as in the nature and the quantities of the by-products formed [6,18,19]. In this sense, previously we performed a kinetic study of the photolysis of sethoxydim in different natural waters under sunlight [20]. We observed that the rate of photodegradation of sethoxydim varied as a function of organic matter content, showing the lowest degradation rate at the highest concentration of organic matter.…”

Aqueous photodegradation of sethoxydim herbicide: Qtof elucidation of its by-products, mechanism and degradation pathway

“…The same authors detected up to fourteen degradation products of sethoxydim, identifying only one as the sulfone derivative by comparison with an analytical standard (Shoaf and Carlson, 1992). In a previous work by our research group, different experiments were carried out to simulate the photodegradation of sethoxydim in natural waters under sunlight (Sevilla-Morán et al, 2010b). Under these conditions, the herbicide was rapidly photodegraded (e.g., t 1/2 (river water) ≈ 7 h) to several unknown photoproducts.…”