Abstract:
:Aquifer contamination by petroleum hydrocarbons leads to measurable changes of groundwater hydrochemistry, primarily due to the microbiological activity. This study analyzes this phenomenon at an historical kerosene-contaminated site in Vitanovac (central Serbia). Due to the long-term hydrocarbon contamination and exposure to aerobic and anaerobic biodegradation mechanisms, the lowest concentrations of O2, NO3-, and SO42- (electron acceptors) and the highest concentrations of Mn and Fe (products of microbial metabolic activity) overlap. The terminal redox-accepting processes in groundwater ranged from oxygen reduction to sulfate reduction. The most anoxic processes were registered in piezometers closest to the source of contamination, as was also confirmed by the redox potential (Eh) measurements. High electrical conductivity values and the highest TOC, SiO2, and Al concentrations also overlap in the contaminated zone close to the source of contamination. Scanning electron microscopy study of quartz grains from the zone undergoing the impact of biodegradation confirmed the occurrence of weathering microscale processes on mineral surfaces. Taking all these factors together, it seems reasonable to assume that microbiological activity has caused the enhanced weathering of silicate minerals.
journal_name
Environ Geochem Healthjournal_title
Environmental geochemistry and healthauthors
Marić N,Štrbački J,Mrazovac Kurilić S,Beškoski VP,Nikić Z,Ignjatović S,Malbašić Jdoi
10.1007/s10653-019-00462-9subject
Has Abstractpub_date
2020-07-01 00:00:00pages
1921-1935issue
7eissn
0269-4042issn
1573-2983pii
10.1007/s10653-019-00462-9journal_volume
42pub_type
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