A rapid and simple method for the direct screening of paraquat (PQ) and diquat (DQ) in olive oil samples is proposed. The sample screening method involves supercritical fluid extraction (SFE) (clean-up followed by the extraction of the analytes) followed by continuous flow electrochemical detection. Those samples for which the total concentration is close to or above the threshold limit established by the Columbian Society for Social Protection (0.05 microg g(-1)) are subsequently analyzed by liquid chromatography (LC) with diode array detection (DAD). This confirmation method allows the determination of PQ and DQ in the range between 0.04 and 1.0 microg g(-1), with average relative standard deviations lower than 3.5%, and 0.003 and 0.002 microg g(-1) detection limits for PQ and DQ, respectively. The proposed arrangement opens up interesting prospects for the direct determination of polar pesticides in complex samples with a good throughput and a high level of automation.
We use a
Dimension reduction method called principal component analysis (PCA). In order
To evaluate the robustness of these systems, different noisy environments have
Been used. The obtained results using TIMIT database showed that, using the
Paradigm that combines these spectral cues leads to a sig...
We present phase-resolved near-infrared photometry and spectroscopy of the
Classical nova V1500 Cyg to explore whether cyclotron emission is present in
This system. While the spectroscopy do not indicate the presence of discrete
Cyclotron harmonic emission, the light curves suggest that a sizable fr...
We derive a set of constraints on soliton solutions using geometric
Deformations, and transformations by internal symmetries with space-dependent
Parameters. We show that Derrick's theorem and a more complete set of
Constraints due to Manton are special cases of these deformation constraints
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