Zs. P. Komáromy szerk.: Studia Botanica Hungarica 16. 1982 (Budapest, 1982)
Hably, Lilla: The relation between Pb-pollution along mainroads and the trace element-composition in soil and vegetation (Examination of section rectangular to M3 mainroad)
produced by mixing 150 ml ce. HCIO4 solution and 500 ml cc. H^Fg. Distilled on waterbath until the substance losts its smell, it was washed into a 100 ml wessel, with tridistilled water poured up to sign. The samples thus prepared were measured by atomic absorption spectrophotometer. The measurements of all the samples of soil section No. 30 were made for Mn, Zn, Cu, Pb elements. The data were measured tojig/g in the following manner: The parallel results were averaged then the value of the blind sample measured for checking was substracted. The result was divided by 0.4. The quantitative data of respective elements were correlated with the data of the spectroanalysis . To determine the full-element contents of the rest of the sections the values obtained by spectroanalysis and corrected were used. 2.4.2. The determination of the soluble trace element contents of soils by means of EDTA-shaking The aerodry and homogeneous samples were dried at 105 C then 15.0 g soil was measured to 75 ml EDTA. (EDTA-solution was made from 104.64 g EDTA with 5 1 tridistilled water.) The chemical reaction of the suspension was measured to pH 7, then shaken in shaking mashine for one hour. Then the suspension was centrifuged for 20 min., the supernatant part poured off, and filtered into adequately preparated polyethylene flasks. The measurements were made using the previous apparatus. The results were calculated into jig/g in the following way: The parallel measurements were averaged, the value of the control blind sample was substracted and the results thus obtained multiplied by 75/15. Mn, Zn, Cu, Pb were measured in the samples of each soil section. 2.4.3. The determination of trace element contents of plants by digestion methods The plant samples collected were thoroughly clean with distilled water. This is necessary because certain parts of the plant, especially the leaf absorb on their surface some elements, so Pb in great quantities. This quantity is not actually integrated in the plant tissues (KLINCSEK 1976), Some similar samples were prepared for examinations, both washed and unwashed. All the samples were dried at 105°C, then pulverized in mill. Of the plant fragments thus obtained a quantity of 1.0000 g was measured. This was distilled with 15 ml ce. HNO3 then 5 ml cc. H2O2 solution was poured over it. With this it was distilled again. This latter procedure was twice repeated. The resulting four times distilled substance was suspended in 5 ml 4 per cent HNO3 , while being heated, then washed into a 25 ml vessel pouring tridistilled water on it up to the sign. The samples were stored in polyethylene flasks, and measured with the above mentioned apparatus. In this way the full Mn, Zn, Cu, Pb contents of the plant samples were determined. II. Examination results 1. The comprehensive characterization of soil sections Comparing the different data of measurement given below a comprehensive characterization of our soil sections will be provided. y Section No. 30 (Fig. 2) The lower limit of the uppermost, so-called A-level can be fixed at a depth of about 20 cm on the basis of field obsevations and of data measured; the lowest layers of B and C are at 120
