Research on Temporal Leachability of Trace Elements from Opoka-Rocks in The Aspect of Geochemical Environmental Indicators

Abstract

As part of the work on the trace element concentration in building materials and their leachability to the environment, the analyses of the temporal release of the trace elements group that could play a role as environmental chemical indicator were carried out. For a period of about half a year, in water eluates with different temporal fractions the leachability for: Sr, Ba, Mg, Mn, Zn were determined. Lumpy varieties of the opoka-rocks from the pre-industrial deposits and historical buildings were the material subjected to the analyses. The research methodology covered studies using broad analytics. The phase methods were used in order to uniquely identify the crystalline components of the studied rocks. Mineralogical and petrographic investigations were performed using Olympus BX-51 polarizing microscope and (SEM) FEI Quanta 200FEG electron microscope equipped with an X-ray spectrometer (EDX Genesis) and a backscattered electron detector (BSE). The concentration of these trace elements in water eluates in 8 temporal fractions was carried out in accordance with EA NEN 7375: 2004 and PN-EN ISO 11885 standards using the ICP sequential plasma spectrometer. It was found that the series of leachability of the studied elements in decreasing succession is as follows: Mg> Sr> Zn> Ba> Mn. The highest leachability from the selected elements was found for Mg, which ranged from 0.22 to 1.14 ppm