Comparison of on-line solid-phase disk extraction to liquid-liquid extraction for monitoring selected pesticides in environmental waters

Analytical Methods for Performing Pesticide Degradation Studies in Environmental Samples

“…This mass spectrometry method provides necessary information about the degradation products during the process that can lead to a proposal of a transformation route for the pesticides studied. In another study, Diazinon 2-isopropil-6-metilpirimidin-4-ol (IMP) and 2-isopropil-6-metilpirimidin-4-il fosfato (dizoxon) UV-vis, GC/MS LSE/SPME Chiron et al, 1993 . The concentration of these compounds was monitored by high performance liquid chromatography with a UV detector using the wavelengths of 237 and 220 nm to quantify trifularina and bromoxinyl, respectively.…”

Optimization of solid-phase extraction using developed modern sorbent for trace determination of ametryn in environmental matrices

“…Also, the columns were washed with 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 mL acetonitrile and its influence on extraction recovery was examined. Another experiment performed during this section of study was evaluation of the different methanol and water values (9,8,7,6,5,4, and 3 mL) on ametryn recovery. Finally, the effect of first vacuum time in washing step (5,10,15,20,25, and 30 min), on the ametryn recovery was investigated.…”

“…One reason was the pressure to decrease organic solvent usage in laboratories which has encouraged the requirement for solvent-free procedures [2]. Also, many polar analytes are often partly soluble in water and cannot be extracted with good recoveries by LLE procedures whatever the organic solvent selected [3,4]. At the same time, the availability of cleaner and more reproducible sorbents than in the past has also helped its increasing acceptance by regulatory agencies.…”

Analytical Aspects of Amino, Quaternary Ammonium, Nitro, Nitroso and Related Functional Groups

“…The effect of SPE was studied on the determination of thirty pesticides and their transformation products was based on derivatization by reaction 7, using UVD or FLD (EPA method 531.1). The method was used for analysis of river waters of Spain and France 195 .…”