Detection and quantitation of sulfonylurea herbicides in soil at the ppb level by capillary electrophoresis

Dinelli, Giovanni; Vicari, Alberto; Brandolini, Vincenzo

doi:10.1016/0021-9673(95)00099-9

Cited by 72 publications

(33 citation statements)

References 16 publications

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“…Thus, different BGE compositions were evaluated. Phosphate-and borate-based BGE and their mixtures are commonly used to separate SUs at pHs above 7.0 [15,16]; thus, they were tested in preliminary studies. From the obtained results, sodium borate-based BGE was selected for further analysis based on the migration times of the analytes and the electrical current during separation.…”

Section: Preliminary Studiesmentioning

confidence: 99%

Screening and Evaluation of Variables for Determination of Sulfonylurea Herbicides in Water Samples by Capillary Zone Electrophoresis

2016

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Abstract:A simple and rapid capillary electrophoretic method was developed for the simultaneous determination of two sulfonylurea herbicides in water samples: metsulfuron-methyl (MSM) and nicosulfuron (NS). These herbicides are widely used in agricultural practices and their residues represent potential environment pollutants in waters and soils. The effect of the pH of the background electrolyte solution (BGE), the percentage of methanol in the BGE and the separation voltage were studied on the resolution of MSM and NS. A 2 3 factorial design was used to identify the main factors which significantly influenced the separation of these compounds. Other parameters were evaluated by the univariate method. The experimental results show that using a BGE composed of 25 mmol·L −1 sodium borate and 3% (v/v) of methanol at pH 8.5 and applying 15 kV, satisfactory analysis time and resolution between peaks can be obtained. The linear range for both analytes was 0.1-2.0 µg·mL −1 . The detection limits were 0.034 µg·mL −1 for MSM and 0.044 µg·mL −1 for NS. Surface water and groundwater samples were analyzed applying the new method, and the obtained results presented satisfactory recovery percentages (82%-102%).

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Section: Preliminary Studiesmentioning

confidence: 99%

Screening and Evaluation of Variables for Determination of Sulfonylurea Herbicides in Water Samples by Capillary Zone Electrophoresis

2016

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“…For ILs with the same anion, the viscosity of the ILs increases with an increase of the alkyl chain length, and the polarity of the ILs increases with increase of the alkyl chain 6 ], were used as the extraction solvents to treat the samples. The structures of ILs have a signicant inuence on their physicochemical properties, which might greatly affect the extraction recoveries of the target analytes.…”

Section: Sample Preparation Optimizationmentioning

confidence: 99%

Determination of sulfonylurea herbicides in soil by ionic liquid-based ultrasonic-assisted extraction high-performance liquid chromatography

et al. 2014

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A high-performance liquid chromatography method for determination of sulfonylurea herbicides in soil has been developed. Prior to the determination, sample preparation was performed by ionic liquid-based ultrasonic-assisted extraction (IL-based UAE). Dried soil powder was mixed with a room temperature ionic liquid, [C 6 MIM][BF 4 ], to form a suspension, and then ultrasonic extraction was performed in a water bath at ambient temperature. The chromatographic separation was performed using a C18 chromatographic column with gradient elution mode. The method was validated by evaluating the repeatability, linearity, precision, and applicability. The limits of detection ranged from 7.7 ng g À1 to 11.3 ng g À1 and the limits of quantification were between 25.6 ng g À1 and 37.6 ng g À1 . The calibration curves showed a good linear relationship (r > 0.9990) in the concentration ranges of 50.0-25 000 ng g À1 for nicosulfuron and 50.0-5000 ng g À1 for metsulfuron-methyl, bensulfuron-methyl and pyrazosulfuron-ethyl. The recoveries ranged from 81.1 to 100.1% with relative standard deviations lower than 7.44%. The IL-based UAE is free of volatile organic solvent, and consumes less sample, time and solvent, compared with regular ultrasonic and Soxhlet extractions. There was no obvious difference in the extraction recoveries of sulfonylurea herbicides obtained by the three methods.

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“…Recently, CE using micellar electrokinetic capillary chromatography (MEKC) has proven to have a good potential for detecting sulfonylurea herbicides in different matrices such as water [10,[14][15][16], soil [14,17,18], grain [19], and phenylurea herbicides in water [20]. However, CE applications are generally limited by high detection limits involving the most common detection method, UV spectrophotometry.…”

Section: Introductionmentioning

confidence: 99%

“…One approach to improving detection limits is to employ preconcentration methods [11,12]. The most popular preconcentration technique used in CE is reversed-phase solid-phase extraction (SPE) [9,[13][14][15][16][17][18]. In contrast, conventional liquid-liquid extractions followed by long evaporation and purification steps have only been reported for agricultural grain commodities [20].…”

Section: Introductionmentioning

confidence: 99%

Determination of urea-derived pesticides in fruits and vegetables by solid-phase preconcentration and capillary electrophoresis

et al. 2001

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A multiresidue analytical method based on solid-phase extraction (SPE) enrichment combined with capillary electrophoresis (CE), using micellar electrokinetic capillary chromatography (MEKC), was developed to determine ten substituted urea pesticides in orange and tomato samples. Several factors such as pH, composition and concentration of the buffer, concentration of surfactant, addition of organic solvent, and working voltage were optimized to obtain the best compound separation in the shortest time. Separation can be achieved in 7 min using a micellar aqueous pH 9 buffer composed of 4 mM borate and 35 mM sodium dodecyl sulfate. After an SPE procedure, which provided a 10-fold enrichment, the limit of detection was about 0.05 mg kg(-1), which is in the order of the maximum residue limits (MRLs) established by the European Union (EU) for most of these compounds. Increasing the enrichment factor by using a larger amount of sample is difficult in oranges due to the matrix interferences, but is possible in tomatoes, which gave cleaner extracts and easily reached a 25-fold enrichment factor. The procedure involving SPE and CE provided acceptable recoveries (ranged 42-118%) and relative standard deviations (RSDs; < 19%) at levels between 0.3 and 5 mg kg(-1).

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Detection and quantitation of sulfonylurea herbicides in soil at the ppb level by capillary electrophoresis

Cited by 72 publications

References 16 publications

Screening and Evaluation of Variables for Determination of Sulfonylurea Herbicides in Water Samples by Capillary Zone Electrophoresis

Screening and Evaluation of Variables for Determination of Sulfonylurea Herbicides in Water Samples by Capillary Zone Electrophoresis

Determination of sulfonylurea herbicides in soil by ionic liquid-based ultrasonic-assisted extraction high-performance liquid chromatography

Determination of urea-derived pesticides in fruits and vegetables by solid-phase preconcentration and capillary electrophoresis

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