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Modification of Loss-On-Ignition Method for Determination of Organic Matter
in Highly Calcareous Sediments
Conference Paper · March 2022
DOI: 10.19261/eec.2022.v1
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2 authors:
Oleksandr Goncharov
Aws Alghunaim
Biology Centre CAS
Kuwait Institute for Scientific Research
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Dedicated to the 70th Anniversary of
Academician, Professor Gheorghe DUCA
The 7th International Conference
ECOLOGICAL AND ENVIRONMENTAL
CHEMISTRY-2022
March 3-4, 2022, Chisinau, Republic of Moldova
ABSTRACT BOOK
Volume 1
*Chisinau-2022*
The 7th International Conference: "Ecological and Environmental Chemistry-2022", March 3-4, 2022, Chisinau, Republic of Moldova
EEC-2022 Abstract Book, Volume 1, DOI: http://dx.doi.org/10.19261/eec.2022.v1
Fig. 1. The purification degree of aqueous solutions of radioactive isotopes: 1 – 5 – recycle coefficient.
Fig. 2. The effect of LTPE on Sr and Cs extraction.
It has been showed high effectiveness of low-temperature plasma electrolysis method in extraction of heavy
metal salts and radioisotopes from aqueous solutions.
MODIFICATION OF LOSS-ON-IGNITION METHOD FOR DETERMINATION OF ORGANIC
MATTER IN HIGHLY CALCAREOUS SEDIMENTS
Oleksandr GONCHAROV1, Aws ALGHUNAIM2
1
Ukrainian Scientific Center of Ecology of the Sea, Ukraine,
2
Kuwait Institute for Scientific Research, Kuwait
Biogenic sands are widespread on the planet coasts and in shallow waters (mainly in low latitudes). This type
of sediments is composed of pieces the skeletal remains of plants and animals such as clams, sea snails,
foraminifera, algae, corals, echinoids, sponges, etc. This biogenic material consists mainly of calcium
carbonate.
Determination of organic matter in these sands is associated with a number of methodological difficulties,
especially if carbonates constitute the main fraction. There are two main approaches for the determination of
organic carbon on marine sediments, namely (1) chemical oxidation of organic matter and (2) hightemperature combustion. Both of these approaches are affected by carbonate harmful influence. Approach (1)
is completely unsuitable due to the fact that carbonates react with an oxidizing agent (sulphuric acid and
potassium dichromate). Approach (2) is influenced by oxidizing carbonates at high temperature.
105
The 7th International Conference: "Ecological and Environmental Chemistry-2022", March 3-4, 2022, Chisinau, Republic of Moldova
EEC-2022 Abstract Book, Volume 1, DOI: http://dx.doi.org/10.19261/eec.2022.v1
The Loss-On-Ignition method relates to approach (2). In the ‗normal‘ case the sample of sediments is treated
in a muffle furnace for certain time (usually 1.5-6 hours) at high temperature (most commonly 450-950o C).
The difference between the initial and final sample weights is converted to organic carbon units.
For slightly calcified sediments is recommended to eliminate carbonates by hydrochloric acid with following
rinsing, filtering and drying to remove reaction products. But the predominance of carbonates in biogenic
sands makes this recommendation difficult to implement. Additionally, flushing and filtration can result in the
loss of some of the water-soluble organic matter
The reaction between calcium carbonates and hydrochloric acid leads to the formation of calcium chloride
which is highly hygroscopic. We propose the scheme of temperature-controlled weightings after carbonates
and hydrochloric acid reaction. The fact is that calcium chloride hydrate contains different amounts of water
depending on the temperature. We propose to control this factor by using pure calcium chloride as a ‗blank‘.
This blank should be processed together with the sample after HCl treatment in all stages. There are following
stages: drying, combustion, cooling, and weighting. Weighing of the sample and blank should be carried out
immediately after each other after stabilization of the selected temperature.
MODELING AND MONITORING OF EURASIAN NATURAL MINERAL WATERS
Elena KORNILOVA, Nikolay KORNILOV
North Caucasus Social Institute, Stavropol, Russia
Natural mineral waters of Russia, some CIS countries (Belarus, Moldova, Armenia, Azerbaijan, Georgia and
Uzbekistan) and Eurasian countries carried to Chloride-Hydrocarbonate type have been investigated. The
analytical dependences connecting, entered by authors, characteristic parameters of structure of waters (М, В,
Ф) with independent variables of ionic structure and concentration are resulted.
Based on the obtained data a mathematical model of the structure and properties of chloride-hydrocarbonate
mineral waters is developed and the principles of formation of waters of a certain type and their distribution
into groups and classes are formulated. A general system of classification of Eurasian mineral and low
mineralization waters formed during the Late Alpine tectogenesis on the territory of European states has been
developed.
Results of research have shown an opportunity to apply characteristic parameters of structure of waters for the
organization of national and interstate monitoring natural waters of various genesis and structure. Change of
values of characteristic parameters of the mineral water counted on initial data of the chemical analysis of
structure, can serve as a quantitative estimation of quality of mineral water and to be used for the organization
of system of national and interstate monitoring waters.
In this work it was shown that comparison of values of characteristic parameters of mineral waters and
physiological liquids of plants, animals and the person can form a basis for development of recommendations
on application of mineral waters for medical, rehabilitation and preventive application in a medical and
biologic practice. Characteristic parameters of structure of waters can be used at examination of quality and
conformity of mineral water to passport characteristics of declared analogue of reference water, and also for an
establishment of the location of a source.
Expansion of geography of a finding of sources of the mineral waters identified on their conformity to
reference mineral waters on characteristic parameters М, В, Ф allows to use rationally regional natural water
resources and to promote social development of territory of a location earlier sources of mineral waters not
taken into consideration.
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