Investigation of Concretions from the Baltic Sea

The composition and specific features of the dissolution of iron manganese concretions from the Baltic Sea are investigated using an echelle spectrometer and atomic absorption spectrometry. The concretion samples used in the analysis are treated in diluted solutions of hydrochloric and nitric acids with additives of hydrogen peroxide. The as-analyzed ratio Mn : Fe in the samples studied is equal to 1.7, which is an important characteristic of the ratio of d elements involved in concretions from the Baltic Sea. The results of the investigations performed can be used to develop more efficient methods for selective extraction of manganese from similar concretions and to determine the isotope content in noble gases of ancient artifact origin that survive in concretions of the World Ocean.