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)
40. Washed leaf of maple near hole No. 37. 40. a. Unwashed leaf of above sample, 41. Washed leaf of CeUis near hole No. 37. 41. a. Unwashed leaf of same. 2. Methods of examination. 2.1. Preparation of Samples The wet samples collected from the soil and bedrock were placed on filter paper, left to dry, then made homogenious and quartered. This quartered sample was used in the further tests, partly directly, e.g. determination of grane size distribution, determination of removable trace element content; partly through further preparation. The samples were ground in a mill with achate balls. Soil samples thus prepared were tested by means of derivatograph, and of atomic absorption in order to determine all the Cu, Zn, Mn, Pb as well as spectrum analysis. Here grain size distribution tests spectroanalysis as well as micromineralogical examinations are not dealt with since these did not essentially contribute to the solution of our main problems. 2.2. pH-measurements 20 g of each averaged and aerodry sample were measured on balance, then kept in fifty ml of destilled water for about six hours. The chemical reaction of the suspension obtained in this way and stirred several times was measured on an O.P. 107 portable pX-meter, 2.3. Derivatographic measurements From all the averaged samples and in case of separated samples from every part smaller than 0.063 mm derivatogramms have been made. 1000 mg of aerodry samples were measured by MOM derivatographic equipment. The apparatus equipped with a photoemulsion registration equipment was heated to a maximum temperature of 1000°C, at a rise of 10°C per minute. TG was set at 200 mg, the sensitivity of DTG and DTA was set to 1/10. The other apparatus equipped with registration facilities was heated to a maximum 100°C with the TG set at 200 mg; the sensitivity of the registration DTG was 2.5 mV that of DTA was 250 jaV . In the interest of quicker proceedings both apparatuses were used. Part of the samples was measured in one of them, the other part of the samples in the other. Given the same samples, fractions under 0.063 mm were measured always on the apparatus which was used earlier for the examination of the average sample. 2,4. Atom absorption examinations 2.4.1, The determination of the full element contents of the soil by means of digestion The aerodry samples pulverized in achate ball and tube mill were dried in a drying cupboard at 105°C, then 0,4000 g were added to 15 ml digestion acid. The digestion acid was
