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A simple and rapid micellar electrokinetic capillary chromatography method of trifloxystrobin, tebufenozide, and halofenozide has been developed. The separation was performed in a 10 mM borate-18 mM SDS buffer solution (pH ¼ 9.0), containing 22.5% v/v of acetonitrile, 25 kV and detection at 202 nm. The linear concentration range of application was 0.5-10.0 mg L À1 , with a detection limit of 0.094 mg kg À1 for trifloxystrobin and 0.088 mg kg À1 for tebufenozide and halofenozide. Analysis yielded good reproducibility (RSD between 1.7-8.7%). The applicability of the method was tested by analyzing several fortified samples of tomato, celery, and apple juices. Recovery levels were between 70.0 and 110.8%.

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A sensitive and selective voltammetric method for simultaneous determination of Sb(III) and Mo(VI) using Quercetin (Q) as complexing agent is described. Optimal conditions were found to be: pH 3.7, CQ=6.0 µmol L−1 and Eacc=−0.10 V. The LOD (3σ) for Sb(III) are 0.076 and 0.040 µg L−1, whereas for Mo(VI) are 0.086 and 0.048 µg L−1 with tacc of 60 and 120 s, respectively. The method was validated using synthetic sea water (ASTM D665) and was applied to the determination of Sb(III) and Mo(VI) in natural waters with satisfactory results.

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