ORIGINAL PAPER
The role of sample preparation methods in the trace element analysis of westphalian deposits from the Lublin Coal Basin (Poland)
1
Silesian University of Technology
Submission date: 2019-06-19
Final revision date: 2019-08-19
Acceptance date: 2019-12-20
Publication date: 2019-12-20
Gospodarka Surowcami Mineralnymi – Mineral Resources Management 2019;35(4):97-112
KEYWORDS
TOPICS
ABSTRACT
The geochemistry of sedimentary rocks is increasingly being used in palaeoenvironmental studies, in the identification of marine versus continental stratigraphy and in chemostratigraphic correlation. The selection of an appropriate research methodology, particularly in terms of sample digestion, can have a significant impact on the accuracy of the results obtained. Depending on the type of rock being studied and the aim of the analysis, a suitable mixture of acids should be used. The most commonly used sample digestion methods are based on a mixture of four acids (multi-acid), aqua regia and inverse aqua regia. As opposed to multi-acid whole-rock digestion, the use of aqua regia and inverse aqua regia result in only the partial digestion of sedimentary rocks. Geochemical analyses using these two different methods were carried out on Carboniferous sedimentary rocks from the Lublin Coal Basin from Poland.The elemental concentrations obtained showed essentially different results for some of the elements. A comparison of the elemental concentrations allowed the distinction of three groups of elements:
those that showed small differences between the results from the preparation methods (Co, Mn, Bi, Cu, Zn and Fe),
those where the elemental concentrations were 20–50% lower using aqua regia digestion (i.e. Ni, P, Pb, Mg, Cd, Th, Mo, Sr),
elemental concentrations that were significantly lower (by up to 80%) following aqua regia digestion (U, Cr, Ba, Na, V, Al, Rb, K, Zr).
METADATA IN OTHER LANGUAGES:
Polish
Wpływ metody przygotowania próbek na wyniki analiz pierwiastków śladowych na przykładzie osadów westfalu Lubelskiego Zagłębia Węglowego (Polska)
pierwiastki śladowe, metody roztwarzania, metoda czterech kwasów, metoda wody królewskiej
Badania geochemiczne skał osadowych są coraz częściej wykorzystywane do badań paleośrodowiskowych, identyfikacji horyzontów morskich oraz chemokorelacji. Dobór odpowiedniej metodyki badawczej, w szczególności metod roztwarzania próbek, ma znaczący wpływ na uzyskiwane wyniki. W zależności od rodzaju skał i celu badań stosuje się, do roztwarzania próbek, odpowiednią mieszaninę kwasów. Najczęściej stosowane metody roztwarzania próbek oparte są na mieszaninie czterech kwasów, wodzie królewskiej i odwróconej wodzie królewskiej. Mieszanina czterech kwasów służy do uzyskania pełnej mineralizacji skały, natomiast woda królewska i odwrócona woda królewska są stosowane do częściowego roztwarzania skał osadowych. Analizy geochemiczne przy użyciu dwóch różnych metod roztwarzania próbek przeprowadzono dla osadów karbonu z Lubelskiego Zagłębia Węglowego (Polska). Koncentracje pierwiastków uzyskane przy użyciu dwóch różnych metod roztwarzania (mieszanina czterech kwasów oraz woda królewska) wykazały w niektórych przypadkach zasadniczo różne wartości. Porównanie wyników badań koncentracji pierwiastków uzyskanych za pomocą tych metod pozwala wyróżnić trzy grupy:
pierwiastki, dla których wyniki wykazują małe różnice (Co, Mn, Bi, Cu, Zn i Fe),
pierwiastki, dla których wyniki uzyskane po roztwarzaniu w wodzie królewskiej są niższe o 20–50% (m.in. Ni, P, Pb, Mg, Cd, Th, Mo, Sr),
pierwiastki, dla których wyniki uzyskane po roztwarzaniu w wodzie królewskiej są znacznie niższe (U, Cr, Ba, Na, V, Al, Rb, K, Zr).
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