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Tytuł:
Solid-phase-extraction procedures for atomic spectrometry determination of copper
Autorzy:
Walas, Stanisław
Telk, Anna
Opis:
For many years, copper has found fundamental application in metallurgy and electrical industry due to its ductility and excellent electrical conductivity. Nowadays, biostatic properties of this element are ex- ploited in fungicides and wood preservatives, and components of water-treatment agents have attracted growing interest, resulting in its spread in various areas of human life. The need for copper determina- tion at lower and lower concentration levels requires the involvement of dedicated analytical tools. Atomic spectrometric methods are still the most frequently used, but, in some applications, both enhancement of selectivity and increase in sensitivity are required and are realized by introducing solid-phase extrac- tion (SPE) with sorbents selective towards copper. We present the most frequently applied sorbents dedicated to copper preconcentration, new trends in the methods for modifying them and the aspect of copper speciation using sorbents. We pay special attention to construction of on-line and off-line SPE set-ups.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Autorzy:
Walas, Stanisław
Telk, Anna
Miliszkiewicz, Natalia
Opis:
For solid sample quantitative analyses by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), the main analytical problem is the calibration step: evaluation of the function (equation) that correlates the signal with the concentration of analytes in the sample. Except for basic standards preparation, problems result from non-stoichiometric effects during vaporization, transport of ablated aerosols, atomization, and ionization in the plasma. These effects, called elemental fractionation, are mainly sample matrix dependent and thus suggest that standards used for calibration should accurately match the sample matrix. Preparation of such standards is a difficult and time-consuming process, so since the beginning of LA-ICP-MS applications for quantification of solid sample composition, different approaches have been developed to solve the problem, primarily complete matrix matching. Because the calibration of LA-ICP-MS is a key factor for its quantification capabilities, this review summarizes recent calibration approaches and related standards preparation techniques for the analysis of various solid materials by LA-ICP-MS. Selected papers concern the application of reference glasses, solution based standards, synthetic standards based on the main sample matrix component or powdered matrix certified reference materials, matrix-matched standards based on spiked sample materials, and non-matrix-matched standards, for calibration. Isotope dilution methods and signal normalization protocols used in order to improve precision are also considered.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 50

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