Most heavy metals have a negative impact on humans and the environment. Thus, evalua tion of toxin concentration in the environment allows taking measures to improve the quality of life and the environmental conditions. In order to accomplish the research, more accurate methods to reflect the real research object data, are required. Various pedogeo chemical researches on pollution with heavy metals in Lithuania started in the 6th decade of this century and since then a lot of largescale studies have been done. The methods used in these studies have become a methodical basis for other researchers. All these research methods have a sequence, accurate order of coherent field work planning and its uim plementation. Furthermore, these researches require accurate laboratory studies, hitech and the newest analysis methods. This work describes the most commonly examined and applied research methods, focusing on practice, which often raises research objectives. Be sides, the paper presents the sequence of research works from sampling up to the methods and tools for analysis of results.
This article presents the results of investigations addressing the accumulation of heavy metals in different layers of the Lake Talkša, Lithuania. For the sampling from the ice of intact structure of the sediment the turf borer was used. Concentrations of these heavy metals in sapropel layers were determined in the extracts of sapropel. After the preparation of samples, the concentration of Pb, Ni, Cr, Zn and Cu were measured in the laboratory by means of atomic absorption spectrometry. The results showed that sapropel taken from the northern shores of Talkša Lake is stratified according to LAND 20-2005 and should be classified as sludge of I and II category. Based on the concentration of Pb, Ni, Zn, Cu, sapropel should be classified as I category. However, according to the maximum concentrations of Cr (257.5 mg/kg) detected in the upper horizon of the sludge, sapropel should be iconsidered as of II nd category. Within other horizons, sapropel is not contaminated with heavy metals, while metal concentrations could be treated as trace elements. Sapropel recovered from this part of the lake could be exploited by excavation and widely used for various economic needs.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.