Simultaneous Determination of 12 Sulfonylurea Herbicides in Drinking Water after SPE by LC-DAD

Abstract

A liquid chromatographic method (LC) with diode array detection (DAD) for the routine screening and quantification of highly applicated polar herbicides in drinking water samples was developed. The investigated herbicides consisted of 12 sulfonylurea herbicides (amidosulfuron, flazasulfuron, foramsulfuron, iodosulfuron-methyl Na, mesosulfuron-methyl, metsulfuron-methyl, nicosulfuron, prosulfuron, thifensulfuron-methyl, triasulfuron and tritosulfuron) together with 6 polar pesticides of relevance (atrazine, desethylatrazine, desisopropylatrazine, chlortoluron, diuron, fluoxypyr). The herbicides were extracted and concentrated by off-line solid-phase extraction and subsequently eluates were analyzed by LC-DAD. Recoveries obtained from fortified water samples at 100 ng L -1 were in the range of 84-107% with RSD's \20%. The limit of detection varied from 2 to 16 ng L -1 .

One-Step QuEChERS-Based Approach to Extraction and Cleanup in Multiresidue Analysis of Sulfonylurea Herbicides in Cereals by Liquid Chromatography–Tandem Mass Spectrometry

“…These co-extracts can interfere with chromatographic analysis (Łozowicka et al 2012a, 2014Walorczyk and Drożdżyński 2012). Several analytical procedures have been developed for determination of sulfonylurea residues in cereals, mainly based on enzyme-linked immunosorbent assays (Degelmann et al 2006), capillary electrophoresis with ultraviolet-diode array detection (Springer and Lista 2010), and highperformance liquid chromatography with diode array detection (Chao et al 2002;Zhou et al 2006;Gallitzendorfer et al 2011). Although various gas chromatography (GC) and GC-mass spectrometry (MS) methods have been developed, they require chemical derivatization of polar sulfonylureas due to their low volatility.…”

Validation of a liquid chromatography ultraviolet method for determination of herbicide diuron and its metabolites in soil samples

“…Due to analyte low concentration levels comprising interfering diversity, pesticides in water determined by HPLC usually requires the use of very sensitive detectors (such as mass spec's) and involves preconcentration steps which can take over half of the total analysis time (Stork et al 2008, Brondi and Lanças 2005, Azevedo et al 2001, Gallitzendorfer et al 2011. However, diuron and its by-products can be monitored in soil from cropping areas by using sensitivity and reasonable cost equipment as ultraviolet detectors (UV).…”

Determination of six sulfonylurea herbicides in environmental water samples by magnetic solid-phase extraction using multi-walled carbon nanotubes as adsorbents coupled with high-performance liquid chromatography

“…As shown in Table S2, a pretreatment time of less than 15 min is significantly shorter than conventional SPE (2-7 h) [2,5,8]. In comparison with reported MSPE-based methods [13,30], our method presents lower LODs for more SUs.…”

“…The most common analytical methods for SUs are high-performance liquid chromatography coupled with an ultraviolet or diode-array detector (HPLC-UV/DAD) [2][3][4][5][6] and mass spectrometry (HPLC-MS) [7,8]. However, for low concentration of SUs in water, UV detectors cannot provide high sensitivity without enrichment prior to analysis.…”

“…Therefore, pretreatment techniques are imperative for the enrichment and cleanup of SUs in environmental samples in order to achieve the ideal sensitivity and effectively eliminate contaminants from complex matrices. Currently reported pretreatment techniques for SUs in environmental water samples mainly include solid-phase extraction (SPE) [2,5,7,8], dispersive liquid-liquid microextraction [4], stir-bar sorptive extraction [9], and salting-out assisted liquid-liquid extraction [10]. SPE, due to its high recovery, short extraction time, high enrichment factor, low consumption of organic solvents, and ease of automation and operation, has been widely used to concentrate organic compounds in water samples.…”