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11.
Fillâtre Y Rondeau D Bonnet B Daguin A Jadas-Hécart A Communal PY 《Analytical chemistry》2011,83(1):109-117
In this paper we describe the development of the first multiclass pesticide residue method applied to essential oils. A total of 70 pesticides covering a wide range of polarity and currently used on essential oil crops have been included in the method. The procedure consists of a 10-fold dilution of lavandin essential oil followed by a direct injection analysis by liquid chromatography/tandem mass spectrometry. The system used is an API 4000 QTrap equipped with an electrospray ionization interface and operating in scheduled selected reaction monitoring acquisition mode. Matrix effects were evaluated by comparing the slopes of matrix-matched and solvent-based calibration curves. Weak signal suppression or enhancement (<20%) was observed for most of the compounds. Method sensitivity was determined statistically by the injection of five matrix-matched calibration curves with the distribution's normality and the variance's homogeneity checked before establishment of a suitable regression model. Limits of detection (LODs) and quantification (LOQs) were then determined using the blank standard's deviation and the slope of the mean curve. The analytical method has been validated for 67 of the 70 pesticides and meets the following LOQs: ≤1 μg/L for 9 pesticides, ≤5 μg/L for 44, ≤10 μg/L for 9, and ≤20 μg/L for 5. 相似文献
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Walter Wildi Janusz Dominik Jean-Luc Loizeau Richard Linn Thomas Pierre-Yves Favarger Laurence Haller Antoine Perroud Christophe Peytremann 《Lakes & Reservoirs: Research and Management》2004,9(1):75-87
This paper quantifies sediment contamination by heavy metals in four reservoirs and one lake located downstream from major urban areas in Switzerland. The waterbodies include the Wettingen Reservoir (located on the Limmat River downstream from Zürich), the Klingnau Reservoir (on the lower Aare River), the Wohlen Reservoir (downstream from Berne), the Verbois Reservoir (downstream from Geneva) and Vidy Bay (Lake Geneva, city of Lausanne). For all sediment cores and contaminants, a trend is observed from high contaminant values in the lower part of the cores, decreasing to lower concentrations in the upper part of the cores. However, for each site and each element, specific features are recognized. Applying the criteria of the Swiss ordinance on soil protection, all sediment cores must be classified as contaminated by one or more contaminants and at variable levels. From these data, it is concluded that: reservoirs and lakes located downstream from major urban centres in Switzerland have accumulated significant volumes of contaminated sediments in the past, representing the largest, but not the most intensely, contaminated sites on a national scale; the main environmental risk is remobilization of the contaminants and their return to the food chain, particularly by infiltration into the groundwater; and although the processes of remobilization are identified, the conditions of occurrence and the amplitude of the processes are still poorly known. Different options of reservoir and lake sediment management also are discussed and further research topics defined. 相似文献
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Fathi Moussa Pascale Chretie Pierre Dubois Laurence Chuniaud Michelle Dessante Fran ois Trivin Pierre-Yves Sizaret Viatcheslav Agafonov Ren C olin Henri Szwarc Virginie Greugny Claude Fabre Andr Rassat 《Fullerenes, Nanotubes and Carbon Nanostructures》1995,3(3):333-342
In order to check its possible acute toxicity, C60 was incorporated into living human phagocytes. It was observed that C60 has no influence on the survival of human leukocytes. 相似文献
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Pierre-Yves Arqués 《电信纪事》1970,25(11-12):380-388
Composition and performances of a generalised quadratic system, with hard integration andn inputs (which is optimum with the signal-to-noise ratio criterion for random signals and normal noises) are studied when the random input signals come fromN no-correlated sources. Complete results are given in the particular cases of one or two inputs and one or two signal sources. The case of strong signals are then considered. 相似文献
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Dr. Pierre-Yves Geant Dr. Malika Kaci Dr. Jean-Pierre Uttaro Prof. Christian Périgaud Prof. Christophe Mathé 《ChemMedChem》2019,14(5):522-526
The synthesis and anti-HIV evaluation of hitherto unknown 3′-fluoro-5′-norcarbocyclic nucleoside phosphonates bearing adenine with modifications at the 4′ position (ethynyl, vinyl, ethyl, hydroxymethyl) is described. One of the synthesized compounds was found to be an inhibitor of HIV-1 replication, but with moderate efficiency relative to (R)-9-(2-phosphonylmethoxypropyl)adenine ((R)-PMPA, tenofovir), with no concomitant cytotoxicity. 相似文献
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