Article
Article name Sequential extraction method, adapted to modern carbonate sediments
Authors Vosel Y.. ,
Makarova I.. ,
Strakhovenko V.. ,
Vosel S.. candidate of physical and mathematical sciences, vosel@kinetics.nsc.ru
Bibliographic description
Category Earth science
DOI 550.4:550.84
DOI 10.21209/2227-9245-2018-24-9-14-21
Article type scientific
Annotation One of the main subjects of geochemistry is the study of different chemical elements’ speciation forms. This work is devoted to adapting of the sequential extraction method for studying of elements’ speciation forms in modern carbonate bottom sediments. It turned out that the classical methods of sequential extraction are not applicable for the sediments with a big amount of carbonate substance. For a sample of lake sediment with calcite content of about 70 % (based on the RFA results), experiments were conducted with different concentrations and reagent amounts at the carbonate stage of sequential extraction. To conduct experiments, one-gram samples and four types of CH3COONH4 solutions of different volume and concentration: 10 ml of 6 M; 10 ml 8 M; 20 ml 5 M; 100 ml 1 M were taken. Experiments have shown that the most suitable conditions for dissolving the carbonate matter of the bottom sediment at the carbonate stage of sequential extraction is the following proportion: 1 gram of substance per 100 ml of a 1 M solution of CH3COONH4. This proportion not only leads to the complete dissolution of CaCO3, but also left undissolved the Fe oxides and hydroxides. It was found that it is very difficult to separate oxides and hydroxides of Mn from the carbonate material of the sample. Monitoring of the carbonates and Fe/Mn oxides and hydroxides dissolution was carried out by measuring the concentrations of Ca, Sr, Mn, Fe in the obtained solutions by atomic absorption method. Ca and Srwere takenas the main elements of carbonates, and Mn and Fe, as the main elements of oxides and hydroxides
Key words Key words: carbonate sediments; Fe and Mnoxyhydroxides; sequential extraction; lake sediments; speciation forms of elements; adaptation of the sequential extraction method; Ca; Fe; Mn; Sr
Article information Vossel Yu., Makarova I., Vosel S., Strakhovenko V. Sequential extraction method, adapted to modern carbonate sediments // Transbaikal State University Journal, 2018, vol. 24, no. 9, pp.
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