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Hydrobiological Journal
SJR: 0.227 SNIP: 0.901 CiteScore™: 0.5

ISSN Imprimir: 0018-8166
ISSN On-line: 1943-5991

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Hydrobiological Journal

DOI: 10.1615/HydrobJ.v52.i2.90
pages 83-100

Methodical Peculiarities of the Preparation of Samples of Suspended Matter and Bottom Sediments

V. A. Zhezherya
Institute of Hydrobiology National Academy of Sciences of Ukraine, Kiev
P. N. Linnik
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev
T. P. Zhezherya
Institute of Hydrobiology National Academy of Sciences of Ukraine Kiev, Ukraine
M. P. Skobley
State Ecological Inspection Zakarpatye Region Uzhgorod, Ukraine

RESUMO

The procedure of two-step preparation of the samples of suspended matter and bottom sediments is given in the paper. The first step includes "wet combustion" of suspended matter in the mixture of the concentrated sulfuric and nitric acids, whereas the second step − hydrothermal treatment of the non-decomposed residue of suspended matter in the steel autoclave with teflon crucible in the alkaline medium (3.2 Mol/L NaOH) at 230°C for 4.5−5.0 hours. It has been shown that only some portion of suspended matter, which is unstable and depends on its composition, origin, and character, is decomposed as a result of "wet combustion". At the first step of suspended matter samples preparation, the degree of extraction varies over a wide range. The major portion of such metals as Al, Fe, Cu, Ti, Cd, Pb, Zn, and Ni, and also of phosphorus, is extracted at the step of "wet combustion". It includes chemical elements absorbed on suspended matter and detritus and those registered in the organisms of hydrobionts, which remain on the membranous filter with the openings of 0.40 pm in diameter. The fraction, which is rather readily extracted from the composition of suspended matter in the slightly acidic medium at pH ~ 4.0, is in the composition of this portion of metals. This fraction of chemical elements should be considered as bioavailable for aquatic organisms. At the same time, silicon is registered mainly in the poorly dissolved fraction of suspended matter (94.3−99.9%). It is released only as a result of hydrothermal treatment.

Data on the total content of the studied chemical elements in the composition of suspended matter in some water bodies and on the degree of their extraction on the first and second steps of sample preparation, and also in the slightly acidic medium, are given in the paper.


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