Известия Томского политехнического университета: Инжиниринг георесурсов (Feb 2023)
ISOTOPE-CONCENTRATION CHARACTERISTICS OF NATURAL WATERS IN THE NOVOSIBIRSK REGION AS A TOOL FOR CONTROL OF THEIR INTERACTION WITH THE ENVIRONMENT
Abstract
The relevance of the research is caused by the need to develop the differentiation method for the water reservoirs with similar hydrogen and oxygen isotope composition using the combined isotope and concentration characteristic. Purpose: to compare combined isotope and concentration characteristics of individual water reservoirs and to reveal whether to apply them or not for differentiation of the water reservoirs with similar hydrogen and oxygen isotope composition. Methods. Laboratory studies of the chemical composition of natural waters by means of titration, ion chromatography, mass spectrometry with inductively coupled plasma and analysis of the chemical composition of waters using titration were carried out at the Research Laboratory of Hydrogeochemistry at the School of Earth Sciences and Engineering of the Tomsk Polytechnic University. The δD, δ18O, δ13СDIC values of waters and dissolved inorganic carbon were determined in the Research Equipment Sharing Center at the Institute of Geology and Mineralogy SB RAS using the Isotope Ratio Mass Spectrometer FinniganTM MAT 253, equipped by the H/Device and GasBench II. Results. Investigation of the isotope composition of H, O and dissolved inorganic carbon in the natural waters of Skala village in Novosibirsk region (Russia) was carried out. Isotope composition of all studied waters indicates their meteoric and infiltration genesis. Most waters have isotope composition comparable with it in other water objects of the region: δD values are varying from –142 to –114 ‰ whereas δ18O values are varying from –18,5 to –11,6 ‰. Unusual isotope composition of hydrogen and oxygen has been detected in ground water from Skala village: depleted δD and δ18O values combined with exceeding deuterium excess values. Waters under investigation were distinguished in three groups using combined isotope and concentration characteristic of dissolved inorganic carbon: drainage water from mine pit with low dissolved inorganic carbon concentration and enriched with δ13CDIC values from –5,3 to –4,4 ‰, river waters with moderate dissolved inorganic carbon concentration and wide δ13CDIC values from –13,3 to –6,8 ‰, ground waters with maximal dissolved inorganic carbon concentration and depleted δ13CDIC values from –13,3 to –9,2 ‰. The combined isotope and concentration characteristics type of individual water reservoir depends on the water accumulation and isotope exchange with environment.
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