Open AccessEnvironmentálně rizikové chemické prvky na odkališti Brno-Hády
Author(s) -
Václav Hladík,
Jindřich Štelcl
Publication year - 2021
Publication title -
geologické výzkumy na moravě a ve slezsku v roce .../geologické výzkumy na moravě a ve slezsku v roce ...
Language(s) - English
Resource type - Journals
eISSN - 2336-4378
pISSN - 1212-6209
DOI - 10.5817/gvms2021-14056
Subject(s) - fly ash , arsenic , environmental chemistry , atomic absorption spectroscopy , contamination , heavy metals , pollutant , environmental science , christian ministry , pollution , scanning electron microscope , chemistry , metallurgy , materials science , physics , ecology , philosophy , theology , organic chemistry , quantum mechanics , composite material , biology
The studied area is located in Brno-Vinohrady. This location was used for fly ash dumping. Fly ash as a product of coal combustion was deposited there in period from 1967 to 1997 from the in the Červený mlýn and Špitálka heating plants. This material has the ability to absorb pollutants, especially heavy metals in its structure. Elevated concentrations of these elements thus represent a potential environmental risk. The main impulse to have a closer look at this waste dump and the fly ash composition is the planned building of a leisure complex in this area in the near future.The fly ash morphology was investigated by a scanning electron microscope (SEM). The results proved the presence of microspheres. On their surface, heavy metals and other contaminants can be accumulated. The contents of heavy metals were determined in the studied material by atomic absorption spectroscopy (AAS) and X-ray fluorescence (XRF) analysis. Measured values were compared with the limit values of environmental pollution published by the Ministry of the Environment of the Czech Republic and with the results of previous studies from the same place. The limits were exceeded slightly by cobalt (Me = 41.62 ppm; Max = 58.30), and a lot of arsenic (Me = 380.62; Max = 593.35). Amount of arsenic was thus compared with the exposure models, which were created for this location earlier. Its concentration transgressed the line of potential risk for a human organism. The number of radionuclides in the analyzed material by laboratory gamma-ray spectrometry (Me: K = 1.75 %, eU = 6.50 ppm, eTh = 16.75 ppm) was converted to the specific activity of 226Ra (am; Me = 212.40 Bq kg-1) and compared with the limit which is 370 Bq kg-1. Thismethod proved that the deposited material does not contain potentially dangerous amounts of natural radionuclides.Based on the results of this study, especially on the amount of arsenic, the waste dump Brno-Hády represents a potentially dangerous location for the human organism and requires adjustments for possible future utilization as a leisure complex.