Adsorption and desorption of mercury was studied under laboratory conditions using moss (Sphagnum girgensohnii) and Rye grass (Lolium perenne) at different temperatures. Desorption was also studied in a transplantation experiment. The adsorption was rapid and strong for both plant species at different temperatures (q10 to q60 8C) and exposure times (1 h, 1 month) while the evaporation was negligible. Also the leaching of adsorbed mercury was of minor importance. The results emphasise the importance of vegetation in removal of mercury from the atmosphere. They also confirm the suitability of moss and grass for biomonitoring purposes. The high retention of mercury in moss even at q60 8C indicates the possibility of using higher temperatures in pretreatment of samples for mercury analyses. ᮊ
ABSTRACT(Mä lkö nen et al., 1999), gravel sludge (Krebs et al., 1999), sewage sludge and fly ash (Kelly and Tate, 1998),Bioremediation of a heavy metal-polluted soil was investigated in beringite and compost (Vangronsveld et al., 1995a,b; a 3-yr field experiment by adding mulch to a polluted forest floor. Vangronsveld et al., 1996), and Fe-rich limed compostThe mulch consisted of a mixture of compost and woodchips. The remediation treatment decreased the toxicity of the soil solution to (Li et al., 2000) have been found to immobilize metals.
Heavy metals concentrations were measured in the former mining area located in Hornad river valley (Slovakia). Soil samples were taken in 2012 from 20 sites at two field types (grasslands, heaps of waste material) and two different areas. Total content of heavy metals (Cu, Pb, Zn, Hg), urease (URE), acid phosphatase (ACP), alkaline phosphatase (ALP), soil reaction (pH) were changing depending on the field/area type. The tailing pond and processing plants have been found as the biggest sources of pollution. URE, ACP and ALP activities significantly decreased while the heavy metal contents increased. Significant differences were found among area types in the heavy metal contents and activity of URE. No statistical differences in the content of heavy metals but significant statistical differences for soil pH were found for field types (grassland and heaps). Significant negative correlation was found for URE-Pb, URE-Zn and also between soil reaction and ACP and ALP.
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