Abstract
In the last decades an increased interest has been evolved about arsenic and selenium. The aim is to understand the environmental, agricultural and biological role of the these elements. In case of arsenic the mayor reasons are the relatively high concentration of arsenic in marine biota (mg kg-1) and the arsenic contaminated drinking waterbases of some Asian countries besides Hungary. The toxicity of higher level selenium content is also known, nevertheless selenium is essential for some biological functions. Considering its esssentiality, in our country the insufficient selenium intake rate couse lack of selenium. Measuring the concentrations of these elements are cruital but not satisfactory information, but the speciation, that is the form of an element presented in a sample is also required. In both cases the most suitable method to determine concentration is the inductively coupled plasma mass spectrimetry. My objective was to optimase the changeable parameters of the ICP-MS for reaching the lowest (the best) detection limit. For this porpuse I have investigated the effect of parameter change on nett signal intensity and relative signal intensity. With the optimased parameter settings the limit of detection for arsenic and selenium were determined, which are 0,032 ng cm-3 for arsenic, and 0,097 ng cm-3 forselenium.
Highlights
My objective was to optimase the changeable parameters of the ICP-MS for reaching the lowest detection limit
For this porpuse I have investigated the effect of parameter change on nett signal intensity and relative signal intensity
Az arzén és a szelén két olyan elem, melyeknek káros illetve előnyös élettani hatásáról és annak mechanizmusáról egyre több információ áll rendelkezésre
Summary
In the last decades an increased interest has been evolved about arsenic and selenium. My objective was to optimase the changeable parameters of the ICP-MS for reaching the lowest (the best) detection limit. For this porpuse I have investigated the effect of parameter change on nett signal intensity and relative signal intensity. Az elemanalitikai módszerek közül az ICP-MS technika rendelkezik a legalacsonyabb kimutatási határral az elemek nagy része esetében. A gyakorlatban használt elemanalitikai méréseket megelőző nedves roncsolási módszer (Kovács et al, 1996) esetében a roncsoldat ötszörös hígítást igényel, ami összességében 250×-es hígulást eredményez 1 g minta roncsolása esetén; az általam mért mintákban az arzén és szelén koncentrációja 0,1–10 ng/cm körülire csökkent a hígulás miatt − monoelemes méréseknél a mért izotóp nettó jelének maximumára; − valamint Montaser (Montaser és Golighitly, 1987) javaslata alapján relatív jelintenzitás maximumra való törekvéssel
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