Determination of selected neonicotinoid insecticides by liquid chromatography with thermal lens spectrometric detection |
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Authors: | Valéria Guzsvány Azamela Madžgalj Polonca Trebše Ferenc Gaál Mladen Franko |
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Affiliation: | (1) Department of Chemistry, Faculty of Sciences, Research Group of Chemistry of the Academy of Science and Arts of Vojvodina, Trg D. Obradovića 3, 21000 Novi Sad, Serbia;(2) Laboratory for Environmental Research, University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia |
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Abstract: | We studied the analysis of trace amounts of neonicotinoid insecticides by liquid chromatography coupled with a thermal lens spectrometric detector (TLS). This multi-residue analysis method is based on the reversed phase separation on C18 column, isocratic elution and collinear dual beam TLS detection. The insecticides thiamethoxam, imidacloprid, acetamiprid and thiacloprid were detected with retention times of 4.4, 5.7, 6.5 and 8.5 min and limits of quantifications of 50, 89, 10, and 25 μg/L, respectively. The retention times agreed well with those obtained by the same chromatographic method but using a diode-array detector (DAD). The limits of quantifications for imidacloprid were identical in both techniques. However, the limits of quantifications for thiamethoxam, acetamiprid and thiacloprid were up to 8.5 times lower using the TLS detector compared to the diode-array detector. The applicability of the developed procedure was tested on spiked river water and potato samples. |
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Keywords: | Neonicotinoid insecticides HPLC/TLS Quantitation Potato River water |
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