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1
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Determination of norflurazon concentration in wheat leaves using a modified QuEChERS method

100%
Trzebuniak K., Mysliwa-Kurdziel B.
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EN
The aim of this analytical study was to develop and validate an easy-to-use method for measuring the actual level of norflurazon that accumulates in leaves. We amended the QuEChERS method, i.e. Quick, Easy, Cheap, Effective, Rugged, and Safe, which is widely used for pesticide and herbicide analysis in food, and usually combined with HPLC-MS detection. We adapted this method for the detection of norflurazon in leaves or leaf fragments and proposed a useful modification using of HPLC-UV detection. Reproducible retention times of 3.11±0.04 min, precision (RSD<8.0%), LOQ=315 ng∙mL-1 and linearity (R=0.99874) were achieved.
2
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A review of recent developments and trends in the QuEChERS sample preparation approach

100%
Rejczak T., Tuzimski T.
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issue 1
EN
A comprehensive review is presented on the recent developments and trends in the QuEChERS (quick, easy, cheap, effective, rugged, and safe) sample preparation approach. This technique involves liquid-liquid partitioning using acetonitrile and purifying the extract using dispersive solid-phase extraction (d-SPE). Originally, the QuEChERS was introduced for pesticides residues analysis in high moisture fruits and vegetables, but more recently it is gaining significant popularity in the analysis of broad spectrum of analytes in huge variety of samples. The wide range of the technique applications is possible due to introducing various modifications based on the use of different extraction solvent and salt formulation and buffer additions for salting-out partitioning step and the application of various d-SPE sorbents for clean-up step. Therefore, the QuEChERS approach is useful for analysis of, among others pesticides, veterinary drugs and other pharmaceuticals, mycotoxins, polycyclic aromatic hydrocarbons (PAHs), dyes, acrylamide, synthetic musks and UV filters, bisphenols, polybrominated diphenyl ethers and other flame retardants, endocrine disruptors, and other chemical compounds. Thanks to the QuEChERS approach, high-throughput multiresidue methods operate in a routine contaminant control of food products, feedstuff, and environmental samples.
3
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Different approach to determination of pyrethroid pesticides in ornamental plants

86%
Zięba K., Miśkowiec P.
World News of Natural Sciences
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2019
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vol. 27
96-107
EN
The aim of the presented research was to develop and optimize a methodology, particularly dedicated for the quantification of pyrethroids in ornamental plant material on the basis of a rose (Rosa hybrid) with the use of HPLC chromatography and QuEChERS extraction method. High repeatability and reproducibility of the results were obtained by using acetonitrile as an eluent. The determined limits of detection and quantification for deltamethrin equal 5.2 ng and 9.3 ng per 1 cm3 of analysed solution respectively. For cypermethrin these values were: LOD 1.2 ng, LOQ 5.0 ng per 1 cm3 of solution. It has been shown that solutions of deltamethrin and cypermethrin are of high stability – they can be stored at room temperature for as long as 28 days without a change in the concentration. The experiments presented showed that the QuEChERS extraction of deltamethrin from the tested samples can be performed with efficiency above 93% using acetonitrile as a solvent, magnesium sulphate and sodium acetate as the separation salts. For purification Supel ™ QUE sorbent by Supelco was successfully applied. The described analytical method may be a valuable and relatively cheap tool to control the amounts of these pesticides sprayed in environment, wherever there is a suspicion of their excessive use.
4
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Dissipation of methomyl residues in tomato fruits, soil and water using LC-MS/MS

86%
El-Hefny D., Abdallah I., Helmy R., Mahmoud H., El-Hefny D., Abdallah I., Helmy R., Mahmoud H.
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2019
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vol. 59
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issue 3
5
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QuEChERS and soil analysis. An Overview.

86%
Vera J., Correia-Sá L., Paíga P., Bragança I., Fernandes V. C., Domingues V. F., Delerue-Matos C.
Sample Preparation
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2013
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vol. 1
54-77
EN
This paper reviews the Quick Easy Cheap Effective Rugged Safe (QuEChERS) methods used for the analysis of several pollutants in soil. The recent advances made with this method are discussed.The analysis of pesticide residues and other analytes in soil requires the extraction of analytes from this matrix. Following extraction, a clean-up procedure may be performed, if necessary, prior to instrumental analysis. This review considers all aspects of sample preparation, including extraction and cleanup. Several parameters are discussed in extraction optimization namely: soil type and sample amount, hydration, solvent of extraction QuEChERS content, extraction time and agglomeration prevention. In addition, method performance characteristics in soil studies are critically discussed.
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