Abstract
High Contents of arsenic (As) in coal samples from four localities within Neogene deposits of the Pannonian Basin in Slovenia are presented and discussed in this paper. Data from three localities represent interval samples of coal cuttings from wells TER-1 (Terbegovci), Sob-3g (Murska Sobota), and MD-1 (Mislinjska Dobrava). The fourth locality is Globoko, where the main lignite seam was analysed already in 1989. The oldest are coal samples from the MD-1 well which are supposed to be of the Lower Miocene age (except for the shallowest one, which is of the Plio-Quaternary age). Coal samples from the TER-1 and Sob-3g wells are of the Upper Miocene age (Mura Formation). The lignite sample from Globoko is of the Upper Miocene age too (Pontian; Globoko Formation). Most samples were prepared for the ICP-MS method analysis as "whole coal", dry, pulverized lab-samples, weighting ca. 10 g. The results show for all "whole coals" samples considerably increased Contents of As: 22.7, 111.4, 222.1, and 131.4 µg/g for the Lower Miocene (?), and 84.5 µg/g for the Plio-Quaternary coals from MD-1 well, 392 µg/g for coals from the Sob-3g well, and 116 µg/g for a coal from the TER-1 well (both Upper Miocene - Mura Formation). In the case of Globoko, not "whole coal" but its high temperature ash was analysed and showed As content as high as 170 µg/g applying AAS method of analysis, and even 260 µg/g applying the ICP-MS. Origin of As could be pre-Neogene rocks of the hinterland and/or Neogene calc-alkaline volcanites. Mineral-gas exhalations from the under-continental upper mantle, containing As, could also be a source of this highly volatile element.
Highlights
This paper presents a continuation of the paper by Markič & Brenčič (2014), which described a finding of high arsenic (As) content in coal cuttings from the TER-1 well
Coal samples from Neogene deposits of the Pannonian Basin interpreted in this study were collected from four localities shown in Fig. 1 and cited in Table 1
Coal ashes of brown coals have the As Clarke value of 48 μg/g and of hard coals of 46 μg/g
Summary
This paper presents a continuation of the paper by Markič & Brenčič (2014), which described a finding of high arsenic (As) content in coal cuttings from the TER-1 well. In this well they found the As content in the Miocene coal matter as high as 116 μg/g. Sob-3g was a geothermal well drilled in 2012 at Murska Sobota (NE Slovenia). The fourth locality, Globoko, was a lignite exploration area in the northern part of the Krško Polje basin (E Slovenia), where dozens of boreholes were drilled and the lignite seams were explored with underground mine workings between 1981 and 1988 (Markič & Rokavec, 2002)
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