On‐line flow‐through extraction–preconcentration‐large volume injection‐RP LC for trace determination of pyrethroids in Slovak soil

Chalányová, M.; Hutta, Milan; Pagáč, Martin

doi:10.1002/jssc.200900439

Cited by 7 publications

(2 citation statements)

References 30 publications

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“…Therefore, a fast and accurate detection/determination of the PYR residues is necessary. Currently, the main sample preparation methods to extract the PYRs from complex matrix samples are SPE and the quick, easy, cheap, effective, rugged, and safe method . However, both are usually laborious and have a relatively high LOD.…”

Section: Introductionmentioning

confidence: 99%

The use of silica‐coated magnetic graphene microspheres as the adsorbent for the extraction of pyrethroid pesticides from orange and lettuce samples followed by GC–MS analysis

Hou

Zang

Wang

et al. 2013

J of Separation Science

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Graphene-grafted ferroferric oxide microspheres were used as the adsorbent to extract some pyrethroid pesticides (bifenthrin, λ-cyhalothrin, cyfluthrin, cypermethrin, fenvalerate, and deltamethrin) from orange and lettuce samples prior to their determination by GC-MS. The main variables that could affect the extraction, including the amount of the adsorbent, pH of the sample solution, extraction time, concentration of salt, and desorption conditions, were investigated and optimized. Under the optimized conditions, a linear response was obtained in the concentration range of 0.3-100.0 ng/g for the analytes with the coefficients of determination ranging from 0.9877 to 0.9925. The LODs for the pyrethroids ranged from 0.01 to 0.02 ng/g. The method provided a good repeatability with RSDs < 10.6%. The recoveries for the six pyrethroid pesticides were in the range from 90.0 to 103.7%. The method was applied to the determination of the pesticides in orange and lettuce samples with a satisfactory result.

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Section: Introductionmentioning

confidence: 99%

The use of silica‐coated magnetic graphene microspheres as the adsorbent for the extraction of pyrethroid pesticides from orange and lettuce samples followed by GC–MS analysis

Hou

Zang

Wang

et al. 2013

J of Separation Science

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“…Some of these steps can be combined and automated through coupling to the chromatographic system. Advances in the automation of pesticide analyses in biological samples focus on the cleanup procedure, which involves the separation of target analytes from a large number of interferents present in the matrix 5.…”

Section: Introductionmentioning

confidence: 99%

Automated sample treatment with the injection of large sample volumes for the determination of contaminants and metabolites in urine

Rodríguez‐Gonzalo

García-Gómez

Herrero‐Hernández

et al. 2010

J of Separation Science

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This work reports the development of a simple and automated method for the quantitative determination of several contaminants (triazine, phenylurea, and phenoxyacid herbicides; carbamate insecticides and industrial chemicals) and their metabolites in human urine with a simplified sample treatment. The method is based on the online coupling of an extraction column with RP LC separation-UV detection; this coupling enabled fast online cleanup of the urine samples, efficiently eliminating matrix components and providing appropriate selectivity for the determination of such compounds. The variables affecting the automated method were optimized: sorbent type, washing solvent and time, and the sample volume injected. The optimized sample treatment reported here allowed the direct injection of large volumes of urine (1500 microL) into the online system as a way to improve the sensitivity of the method; limits of detection in the 1-10 ng/mL range were achieved for an injected volume of 1500 microL of urine, precision being 10% or better at a concentration level of 20 ng/mL. The online configuration proposed has advantages such as automation (all the steps involved in the analysis - injection of the urine, sample cleanup, analyte enrichment, separation and detection - are carried out automatically) with high precision and sensitivity, reducing manual sample manipulation to freezing and sample filtration.

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Simultaneous determination of pyrethroids and pyrethrins by dispersive liquid-liquid microextraction and liquid chromatography triple quadrupole mass spectrometry in environmental samples

2017

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A simple and environmentally friendly dispersive liquid-liquid microextraction (DLLME) method coupled with electrospray ionization liquid chromatography triple quadrupole mass spectrometry (LC-QqQ-MS/MS) was developed for the simultaneous determination of 17 synthetic and natural pyrethroids. A comparison of solid-phase extraction (SPE) versus DLLME for water samples and only "dilute and shoot" versus the additional extract cleanup by DLLME for sediment samples is reported. Chloroform was the extracting solvent in the DLLME technique for both water and sediment samples. Ultrasonic energy was applied to fully extract the analytes into fine droplets, providing high recoveries in short times. Method detection limits (MDLs) ranged from 0.12 to 0.62 ng L and recoveries from 70 to 119% with RSD values 2-15% (n = 5) for water samples. In sediment samples, MDLs ranged from 0.50 to 2.50 ng g and recoveries from 71 to 112% with RSDs 2-16% (n = 5). The proposed method showed a good linearity within the range of 10-500 ng mL, with coefficients of determination (R ) higher than 0.99. Matrix effects were observed for most compounds in water and sediment (ME%< -10%). The proposed methodology was applied for the analysis of water and sediment samples from Albufera wetland and Turia River. Acrinathrin (48 ng g) and etofenprox (16 ng g) were detected in sediment samples. Graphical abstract Pyrethrins and pyrethroid determination in water and sediments by DLLME and LC-MS/MS.

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On‐line flow‐through extraction–preconcentration‐large volume injection‐RP LC for trace determination of pyrethroids in Slovak soil

Cited by 7 publications

References 30 publications

The use of silica‐coated magnetic graphene microspheres as the adsorbent for the extraction of pyrethroid pesticides from orange and lettuce samples followed by GC–MS analysis

The use of silica‐coated magnetic graphene microspheres as the adsorbent for the extraction of pyrethroid pesticides from orange and lettuce samples followed by GC–MS analysis

Automated sample treatment with the injection of large sample volumes for the determination of contaminants and metabolites in urine

Simultaneous determination of pyrethroids and pyrethrins by dispersive liquid-liquid microextraction and liquid chromatography triple quadrupole mass spectrometry in environmental samples

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