IMPROVEMENT OF THE SAMPLE PREPARATION IN DETERMINATION OF THE MICROELEMENT COMPOSITION OF BROWN ALGAE USING X-RAY FLUORESCENCE ANALYSIS WITH TOTAL EXTERNAL REFLECTION

We consider the features of sample preparation in determination of the microelement composition of algae using x-ray fluorescence analysis with total external reflection (TXRF). It is shown that complete acid decomposition in a microwave oven is the preferred method of sample preparation, which improves the intra-laboratory reproducibility of the results and reduces the detection limits for the majority of the detectable elements upon TXRF determination of the elemental composition of algae. The detection limit ranges within 0.3 – 0.6 mg/kg for most of the studied elements. Determination of the elements forming volatile compounds (Cl, Br, I, Hg) in algae samples using TXRF method appeared inexpedient.

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