Acta Facultatis Ecologiae - Technická univerzita vo Zvolene

80Mercury content determined in individual fractionsA-D after sequential extraction of soils andpercentage content of mercury (the yield) is presentedin Table 2, where in each sample it is determinedthe highest content of mercury in fraction D(residual rest). Percentage content of mercury inthis fraction varied from 73.65 to 146.9 %. In thesample 3 there was probably made an mistake in thedetermination of mercury content. Determined mercurycontent in the fraction A was mainly under thevalue of detection limit for TMA 254. The mercurycontent determined in fractions B-C was very low,which corresponds to percentage yield content.The Figure 2 shows that particular fractions i.e.free, potentially mobile and mobile forms do notcontain mercury bonded in bio-permissible form.On the contrary, all mercury remains in the rest.In the samples taken from assimilation organsof trees were measured very low values of mercury(approximately 27–380 ng/g). These results wereobtained even though the content of total mercury inthe soils were high (Table 3). Correlation relationshipTab. 2 Mercury content determined in extraction solvents after extraction of soils and the yield of used sequentialextractionNo.Fraction A[ng.g –1 ] /Y [%]Fraction B[ng.g –1 ] /Y [%]Fraction C[ng.g –1 ] /Y [%]Fraction D[ng.g –1 ] /Y [%]1 33.3 0.027 33.3 0.027 33.3 0.027 122 381 99.952 PD 0 49.4 1.330 49.4 1.330 3 152 85.193 PD 0 33.3 0.460 33.3 0.460 10 520 146.904 PD 0 33.3 0.028 33.3 0.028 85 800 73.655 33.3 0.069 66.7 0.137 33.3 0.069 51 300 105.506 148 0.180 49.4 0.060 98.8 0.122 83 780 103.917 PD 0 49.4 0.420 24.7 0.210 10 983 92.998 PD 0 49.4 4.130 PD 0 1 030 86.19Y[%] – yield of used sequential extraction, where 100 % is total mercury content in the soilsUDL – concentration of Hg under the value of detection limitFractions A – D:A – free forms were determined in the extract of extraction solvent 2M HNO 3B – potentially mobile forms was determined in the extract of extraction solvent 0.05M EDTAC – mobile forms were determined in the extract of extraction solvent 0.1M CaCl 2D – solid residual rest, where was determined mercury content bonded in the structure of silicates and in thecrystal lattice of primary minerals140000120000ng/g100000800006000040000TC-HgFrakcia:AFrakcia:BFrakcia:CFrakcia:D2000001 2 3 4 5 6 7 8TC-Hg: total mercury contentFig. 2 Comparison of total Hg content with Hg content in the particular fractions A-D in the soils