THE INFLUENCE OF AGRICULTURAL SOIL PREPARATION METHODS ON THE PSEUDO-TOTAL ELEMENT CONTENT DETERMINED BY ICP-OES

Abstract

The five agricultural soil preparation methods for the purpose of determining the pseudo-total content of 20 elements (Al, As, Ca, Cd, Co, Cr, Cu, Fe, Hg, K, Mg, Mn, Mo, Na, Ni, P, Pb, S, Si and Zn) in 4 soil samples taken from different plots of soils in the vicinity of Vranje (Southern Serbia) was applied in this paper. The following methods were used: digestion with aqua regia and hydrogen-peroxide with heating at temperature 1900C, digestion with aqua regia and hydrogen-peroxide in combination with ultrasound with heating at temperature 950C, digestion with reverse aqua regia and hydrogen-peroxide with heating at temperature 1900C, and digestion with nitric acid and hydrogen-peroxide under reflux with heating at temperature 950C, and digestion with perchloric acid with heating at temperature 1900C. The results were statistically processed using an ANOVA test. The results obtained by this study show that the amount of extracted elements from the soil is influenced by several different factors including the following: soil type, soil content and chemical form of the elements.