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Influence of host rocks on composition of colloid particles in groundwater at the Karachai Lake site

Published online by Cambridge University Press:  09 July 2018

V. I. Malkovsky ,
YU. P. Dikov ,
EN. E. Asadulin  and
V. V. Krupskaya
V. I. Malkovsky
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences (IGEM), Staromonetny per. 35, Moscow 119017, Russia
YU. P. Dikov
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences (IGEM), Staromonetny per. 35, Moscow 119017, Russia
EN. E. Asadulin
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences (IGEM), Staromonetny per. 35, Moscow 119017, Russia
V. V. Krupskaya
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences (IGEM), Staromonetny per. 35, Moscow 119017, Russia
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Abstract

The radioactive contaminant plume in groundwater at the Karachai Lake site has been examined further. The source of pollution is the Karachai Lake which was used as a reservoir for liquid radioactive waste (LRW) from the Radiochemical Production Association “Mayak” (South Urals, Russia). Taking into account that colloid-facilitated transport of radionuclides can substantially increase the contaminant migration velocity, the composition and structure of colloid particles from the groundwater within the contaminant plume were studied. Sampling of groundwater was carried out in the observation well within the contaminant plume. Different fractions of colloid particles were extracted from the groundwater samples by sequential filtration through membranes with decreasing pore size. Chemical and mineralogical compositions of the colloid particles were determined by X-ray photoelectron spectroscopy in combination with ion etching of the particle surfaces. The host rocks were studied using characteristic samples from the surface outcrop nearest to the observation well. The analysis showed that the colloid particles consisted of an inorganic core with a discontinuous organic cover. The inorganic core was close in composition to the host rocks along the flow path with a predominance of layered hydrosilicates.

Keywords

aquiferliquid radioactive waste (LRW)colloidradioactive contaminationradionuclidesKarachai LakeRussia
Type
Research Papers
Information
Clay Minerals , Volume 47 , Issue 3 , September 2012 , pp. 391 - 400
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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