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- W2089223994 abstract "This work shows the potentiality of As as internal standard to compensate errors from sampling of sparkling drinking water samples in the determination of selenium by graphite furnace atomic absorption spectrometry. The mixture Pd(NO(3))(2)/Mg(NO(3))(2) was used as chemical modifier. All samples and reference solutions were automatically spiked with 500mugl(-1) As and 0.2% (v/v) HNO(3) by the autosampler, eliminating the need for manual dilutions. For 10mul dispensed sample into the graphite tube, a good correlation (r=0.9996) was obtained between the ratio of analyte absorbance by the internal standard absorbance and the analyte concentrations. The relative standard deviations (R.S.D.) of measurements varied from 0.05 to 2% and from 1.9 to 5% (n=12) with and without internal standardization, respectively. The limit of detection (LD) based on integrated absorbance was 3.0mugl(-1) Se. Recoveries in the 94-109% range for Se spiked samples were obtained. Internal standardization (IS) improved the repeatability of measurements and increased the lifetime of the graphite tube in ca. 15%." @default.
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- W2089223994 date "2004-10-08" @default.
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- W2089223994 title "Use of the internal standardization for difficult sampling by graphite furnace atomic absorption spectrometry" @default.
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- W2089223994 doi "https://doi.org/10.1016/j.talanta.2004.02.032" @default.
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