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Modification of Multiresidue QuEChERS Protocol to Minimize Matrix Effect and Improve Recoveries for Determination of Pesticide Residues in Dried Herbs Followed by GC-MS/MS

) funded by the Ministry of Science and Higher Education, Poland. Compliance with Ethical Standards Conflict of Interest Ewa Rutkowska declares that she has no conflict of interest. Bożena Łozowicka ... Łozowicka 0 Piotr Kaczyński 0 0 Laboratory of Pesticide Residues, Plant Protection Institute-National Research Institute , Chełmońskiego 22, 15-195 Białystok , Poland 1 Ewa Rutkowska An accurate, rapid, and

Influence of QuEChERS modifications on recovery and matrix effect during the multi-residue pesticide analysis in soil by GC/MS/MS and GC/ECD/NPD

A QuEChERS extraction followed by GC/MS/MS and GC-μECD/NPD for 216 pesticide and metabolites determination in soil simultaneously were developed and compared. Volume of water, volume and polarity of solvent, and cleanup sorbents (C18, GCB, PSA) were optimized. The QuEChERS with and without purification step were applied to estimate effectiveness of the method. The recovery and ...

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

using GC/MS/MS and LC/MS/MS) funded by the Ministry of Science and Higher Education, Poland. Conflict of Interest Piotr Kaczyński declares that he has no conflict of interest. Bożena Łozowicka declares ... Łozowicka 0 0 Institute of Plant Protection-National Research Institute , Chełmońskiego 22, 15-195 Bialystok , Poland 1 Piotr Kaczyński A one-step quick, easy, cheap, effective, rugged, and safe (QuEChERS

Dissipation of S-metolachlor in plant and soil and effect on enzymatic activities

The present study aimed at evaluating the dissipation of S-metolachlor (S-MET) at three doses in maize growing on diverse physico-chemical properties of soil. The effect of herbicide on dehydrogenase (DHA) and acid phosphatase (ACP) activity was estimated. A modified QuEChERS method using LC-MS/MS has been developed. The limit of quantification (0.001 mg kg−1) and detection (0.0005 ...

The influence of effective microorganisms (EM) and yeast on the degradation of strobilurins and carboxamides in leafy vegetables monitored by LC-MS/MS and health risk assessment

The aim of this study was to determine the behaviour of strobilurin and carbocyamides commonly used in chemical protection of lettuce depending on carefully selected effective microorganisms (EM) and yeast (Y). Additionally, the assessment of the chronic health risk during a 2-week experiment was performed. The statistical method for correlation of physico-chemical parameters and ...

The evaluation of a fast and simple pesticide multiresidue method in various herbs by gas chromatography

In this study two analytical methods, one based on matrix solid phase dispersion (MSPD) and the other on liquid–solid extraction (LSE), coupled with gas chromatography, were evaluated and used to determine the presence of 163 pesticides (6 acaricides, 62 fungicides, 18 herbicides and 77 insecticides) in various herbs. Both methods were optimized considering different parameters ...