Abstract
A new analytical method has been developed and validated for the simultaneous determination of pesticides from different classes using ion chromatography-online photochemical derivatisation-fluorescence detector (IC-hv-FD). Fluorimetric detection was performed at λex/λem=332nm/367nm for imidacloprid and then detector was set at λex/λem=247nm/470nm for carbendazim. The two pesticides imidacloprid and carbendazim were successfully separated isocratically on an IonPac® AS11 (250mm×4mm i.d; 13µm particle size, Dionex) anion-exchange column using 40mM KOH with 10% (v/v) acetonitrile and pumped at a flow rate of 1.0mLmin−1. Under the optimized conditions, the limit of detection (LOD, S/N=3) of imidacloprid and carbendazim were 7.8µgL−1 and 67µgL−1, respectively. The experimental results showed that there was good linearity with a correlation coefficient (r)≥0.9966 over the range of 0.05–10mgL−1 for imidacloprid and 0.2–15mgL−1 for carbendazim. Good reproducibility with a relative standard deviation (RSD, n=7) less than 4.5%. Finally, the proposed method was applied with satisfactory results to the analysis of these pesticides in ground water, lake water and river water without any pre-treatment of samples. The average spiked recoveries were in the range of 90–104%.
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