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

A Systematic Review of Photolysis and Hydrolysis Degradation Modes, Degradation Mechanisms, and Identification Methods of Pesticides

“…e critical methods and techniques were very useful for the residue analysis of pesticides and the identification of degradation products, degradation mechanism, and reaction pathway of the pesticides. Many technologies, such as gas chromatography-mass spectrometry (GC-MS/ MS) [96][97][98], liquid chromatography-mass spectrometry (HPLC-MS/MS) [99][100][101][102], ultraperformance liquid chromatography-quadrupole-time-of-flight mass spectrometry (UPLC-Q-TOF-MS) [103][104][105][106][107][108][109], ultraperformance liquid chromatography-orbitrap mass spectrometry (UPLC-Orbitrap MS/MS) [110][111][112][113][114], and high-resolution mass spectrometry (UPLC-HRMS) [115][116][117] were used to separate the degradation products and identify the structure of products. So far, the high-resolution mass spectrometry combined with UPLC is increasingly used in the qualitative screening and degradation mechanism of pesticide metabolites, for its high-resolution ensures high sensitivity, accuracy, and high specificity required for complex sample analysis.…”

Assessing the Effect of Organic Amendments on the Degradation of Profoxydim in Paddy Soils: Kinetic Modeling and Identification of Degradation Products

“…Isomerization of the E-isomer into the Z-isomer has been reported to occur quite readily in dark, aqueous environments, as well as under light and in neutral or acidic environments (Roberts et al, 1998;Sevilla-Morán et al, 2008). Thus, the Z-isomers of clethodim (Villaverde et al, 2018a) and sethoxydim (Sandín-España et al, 2015) were the main degradation products identified under solar irradiation in aqueous media. With the available information, it is straightforward to identify DP1 as the Zisomer of profoxydim.…”

Photodegradation of pesticides using compound-specific isotope analysis (CSIA): a review

“…Due to the different boiling points and thermal sensitivities of some pesticides, such as semi-volatile pesticides, liquid chromatography rather than gas chromatography in combination with mass spectrometry may be used for the analysis of photodegradation processes. For example, ultraliquid chromatography can be coupled with quadrupole timeof-ight mass spectrometry (UHPLC-Q-TOF/MS) 142 or HPLC-Qtof-MS. 143 Research 142 has shown that d 13 C and d 15 N of CSIA for non-volatile compounds can be detected by high-performance liquid chromatography/isotope ratio mass spectrometry (HPLC/IRMS). Other detection techniques and models may be used to validate or supplement the photolytic or biodegradation processes of pesticides that cannot be explained directly by CSIA, such as the occurrence of inverse isotope fractionation.…”