BERYLLIUM IN SOILS AND PLANTS IN IMISSION -LOADED REGIONS

In the territory between the villages Kosice and Brandlin (Tabor distr ict), 3 to 6 km from point resource of pollution (energy device at Pla na nad Luznici, burning brown coal from Sokolovo in predominant direct ion of winds), as to the great soil group the regions were characteriz ed by pseudoglyeic luvisol (LMg), as to the soil texture - the site wi th sandy-loam soil after Novak (20 to 30% grains of grade I) on the sa me geological and petrographic substrate which is muscovite - biotitic to double-mica paragneiss (precambrium - moldanubicum). On agricultur ally left-aside soil of these regions in the cadastre of the villages Kosice - Brandlin samples of humus horizon Ap were taken in which the total content of beryllium (Be) was determined. After ashing at 450 de grees C in muffle furnace samples were decomposed by HCl, H2SO4 and HF (Javorsky, Krecmer, 1987). From the solution Be was extracted by acet ylacetone and chelatone 3 after previous sorption of Be on the column of silicagel from the medium of chelatone 3 after Sulcek (1960). By pu rification of acetylacetonate of Be by shaking out into metylisobutylk etone the medium was obtained for determination of Be by atomic absorp tion spectrophotometry (AAS) using high-energy flame, acetylene - nitr ogen oxide. Plant material of gardening production in the region was a nalyzed in the same way. Results were compared with average Be content determined by the same method of humus horizon of the identical great soil group (LMg), of identical soil texture (sandy-loam soil after No vak) and on identical parental rock (muscovite - biotic paragneiss) in relatively imission-uncontaminated site of the village Rataj u Bechyn e. Average value of total Be content in this soil ranges between 0.01 and 0.05 mg Be.kg(-1) on the significance level alpha = 0.05, it means it is 10 times lower than lower limits of interval of Be content in s oil given in literature. Analyses showed that even soils in the site o f direct fall-out of solid particles of emissions from burning of Soko lovo brown coal with increased Be content do not reach 1/3 of its amou nt which is considered an average in soil. In spite of it, these soils contain roughly 17 times more Be than soils on the same parent rock o f the same genetic type and kind in the imission-uncontaminated site. Very low Be content in plants (12 to 138 mu g.d(-1) dry matter) and Be absence in roots which literature consider the main place of contamin ation with this element show that plants in investigated site are cont aminated not from soil but from air. Be in soils of contaminated regio n (0.5 mg.kg(-1)) is in the category of very low content and does not reach even background values 1.5 mg.kg(-1) (Benes, 1987, 1993; Nemecek , Podlesakova, 1992).