Complex environmental geochemistry of Saline lake sediments

Abstract

Introduction It is quite apparent that a given element, depending on its concentration can be either vital or toxic for any living organism on Earth (Crounse et al., 1983). Several Hungarian studies are known dealing with the factors influencing the migration, adsorption, as well as accumulation of trace elements (Husti, 2006; Osztoics et al., 2005; Tarnawa, Klupacs, 2006). However, there are numerous problematic issues like certain parameters affecting the distribution of trace elements (salt content, pH, interaction of organic matter with clay minerals etc.), which pose further questions for scientists to answer. Not to mention the gradual intensification of human activities, which fundamentally alter the natural processes determining the movement, adsorption and desorption of trace elements. The present study was aimed to shed light onto the parameters and processes, which trigger and control the adsorption, mobilization and enrichment of trace elements and natural radioactive elements occurring in the solid phase of alkaline lacustrine deposits. The recorded element concentrations, distributions, mineral composition, as well as the organic matter content measured in the studied deposits are also given. Plus the degree of radiation deriving from the lacustrine deposits on living organisms is also estimated.