Mercury species in formerly contaminated soils and released soil gases.
Total mercury (T-Hg), elemental mercury (Hg0), methylmercury (MeHg+), phenylmercury (PhHg+), and gaseous elemental mercury (GEM) species were determined in soils formerly contaminated by different processes from two sites in the Czech Republic. Analytical methods involved atomic absorption spectrometry (AAS) using a single-purpose Advanced Mercury Analyser AMA-254 and radiochemical neutron activation analysis (RNAA) for T-Hg determination, a thermal desorption method was used for Hg0determination, gas chromatography coupled with atomic fluorescence spectrometry (GC-AFS) was employed for assay of MeHg+and PhHg+, while GEM measurement was carried out using a portable Zeeman-AAS device Lumex RA-915+. The first sampling site was in the surroundings of a former PhHgCl-based fungicide processing plant next to Příbram (central Bohemia). Although the use of Hg-based fungicides as seed mordant have been banned, and their production stopped at the end of 1980's, highly elevated Hg contents in soil are still observed in the vicinity of the former plant, reaching T-Hg values >13mgkg-1. The second sampling site was an abandoned mining area named Jedová hora Hill near Hořovice (central Bohemia), where cinnabar (HgS) was occasionally mined as by-product of Fe ores hematite and siderite. Mining activities have been stopped here in 1857. Very high contents of T-Hg are still found at this site, up to 144mgkg-1. In most cases we found a statistically significant correlation between T-Hg and Hg0values regardless of the pollution source. On the contrary, insignificant correlation was observed neither between T-Hg and GEM values, nor between GEM and Hg0. Concentrations of the investigated organomercury species were above a limit of detection (LOD) only in the most contaminated samples, where their levels were about two to three orders of magnitude lower compared to those of T-Hg.
University of Chemistry and Technology, AAS laboratory, Technická 5, CZ-166 28 Prague 6, Czech Republic. Electronic address: jirina.sysalova@vscht.cz.
Jiřina
J
Sysalová
Nuclear Physics Institute of the Czech Academy of Sciences, CZ-250 68 Husinec-Řež 130, Czech Republic.
Jan
J
Kučera
Czech Technical University, Department of Nuclear Chemistry, Břehová 7, CZ-115 19 Prague 1, Czech Republic.
Barbora
B
Drtinová
Department of Chemistry, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic.
Rostislav
R
Červenka
Department of Chemistry, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic; Department of Public Health, Masaryk University, Kamenice 753/5, Bohunice, Brno, Czech Republic.
Ondřej
O
Zvěřina
Department of Chemistry, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic.
Josef
J
Komárek
Nuclear Physics Institute of the Czech Academy of Sciences, CZ-250 68 Husinec-Řež 130, Czech Republic.
Jan
J
Kameník
Elemental mercury; Gaseous elemental mercury; Mercury contaminated soils; Methylmercury; Phenylmercury; Total mercury