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Different approaches to the solid-phase extraction of pollutants from water and food products

AuthorsHubetska, T. S.; Kobylinska, N. G.; Krivtsov, I. V.; García, José R.
Issue Date2017
CitationNanomaterials applied to Life Sciences (2017)
AbstractControl of the presence of various organic pollutants in agricultural products is one of the major issues preoccupying the regulatory agencies and industrial laboratories worldwide. The pesticides, produced by the agricultural sector, are regarded as one of the most hazardous contaminants found in the environment. They are not only toxic but also mobile and capable of bioaccumulation. Nowadays, pesticides are found in surface waters and in a growing number of aquifers, thus even if present at low concentration levels constituting a potential risk for ecosystems, drinking water quality and human health. Due to the low concentration of analytes, the complexity of some sample matrices and incompatibility of sample medium with analytical instrument a preliminary sample pre-concentration and/or separation is required. Magnetic nanoparticles have attracted significant attention because of their strong magnetic response combined with easily regulated properties via the surface modification. In this communication we report a new approach for preparation of magnetic nanoadsorbent with covalently grafted non-ionic Triton X-100 surfactant. Mesoporous Triton X-100-immobilized (Fe3O4@Triton) magnetic nanoparticles were successfully synthesized by core-shell technology and characterized using transmission electron microscopy, X-ray diffractional analysis, nitrogen physisortpion, energy-dispersive X-ray elemental analysis, vibrating sample magnetometry. The produced Fe3O4@Triton solid was employed as an adsorbent for the pre-concentration of pesticides present in water and food products before analyzing them by gas chromatography coupled with mass spectrometry GC-MS technique. The variables affecting the performance of the adsorbent in the both extraction steps such as type and volume of eluent and extraction solvent, breakthrough volume, salt addition, extraction time were thoroughly investigated. The proposed method resulted in good linearities (R2 > 0.9915) in the range of 1–10000 ng kg−1, with the limit of detection of 0.5-1.0 ng kg−1 at S/N=3, and precision of % RSD of ≤11.8. Under optimal conditions, the pre-concentration factors obtained were in the range of 2362–10593 for 100 mL of sample solution. In addition, the Quick, Easy, Cheap, Effective, Rugged, and Safety (QuEChERS) method along with the application of the novel magnetic adsorbent (Fe3O4@Triton) was applied for the monitoring of 20 organochlorine pesticides (OCPs) present in fruits and vegetables available in supermarkets of Kyiv, Ukraine. The analyses were carried out by GC-MS. The parameters of the developed analytical method, such as sensitivity, precision, linear range, the lower limits of detection and quantification, were determined for each pesticide. The results showed good linearity and the average recoveries were considered satisfactory reaching values between 69 and 110%, RSD of 2-15 %, except for hexane in strawberry, radish and watermelon samples. The OCPs were detected in strawberry (α- HCH; lindane) and radish (α, β-HCH isomers) samples. The QuEChERS method and GC-MS technique were successfully used to analyze OCPs in commercially available fruit pulps and can be applied for routine laboratory analysis.
DescriptionResumen del trabajo presentado al congreso Nanomaterials applied to Life Sciences (NALS), celebrado en Gijón (España) del 13 al 15 de diicembre de 2017.
Appears in Collections:(CINN) Comunicaciones congresos
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