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- W2002038941 abstract "It is demonstrated that in order to achieve maximal solute preconcentration on one or two given precolumns, it is necessary to use a sample volume larger than the breakthrough volume, even at the risk of obtaining recoveries lower than 100%. This is an important condition when traces of organic pollutants have to be determined in water samples with relatively low organic contamination. A theoretical model is proposed for such conditions using a single precolumn or two precolumns in series and the experimental feasibility of such an approach (sample volume > breakthrough volume) is demonstrated. In addition, a critical comparison is made of different experimental methods for measuring amounts of preconcentrated solutes and the corresponding recoveries. A recommended procedure for the measurement of recoveries is proposed, involving the determination of variations of peak areas obtained during the determination of preconcentrated compounds in increasing volumes of water samples. In each sample, the concentration of the solutes is adjusted in order to have a constant amount. This method has the advantage that recoveries are measured under the same chromatographic conditions as those used for the real sample. At the same time breakthrough volumes can be estimated. Several solutes can be studied simultaneously and the efficiency of spiking can also be tested by this approach. A range of organic pollutants of medium to low polarity and two adsorbents, viz., a bonded C18 silica and the polymer-based PRP-1, were chosen as a model system." @default.
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- W2002038941 date "1988-05-01" @default.
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- W2002038941 title "Recovery of organic compounds from large-volume aqueous samples using on-line liquid chromatographic preconcentration techniques" @default.
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- W2002038941 doi "https://doi.org/10.1016/0021-9673(86)80011-5" @default.
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