TRANSLOCATION OF HG-203 LABELED HGCL2, AND CH3HGCL IN AN IRON-HUMUS PODZOL STUDIED BY RADIO-ANALYTICAL TECHNIQUES

Authors
Citation
K. Schluter, TRANSLOCATION OF HG-203 LABELED HGCL2, AND CH3HGCL IN AN IRON-HUMUS PODZOL STUDIED BY RADIO-ANALYTICAL TECHNIQUES, Zeitschrift fur Pflanzenernahrung und Bodenkunde, 159(2), 1996, pp. 215-226
Citations number
31
Categorie Soggetti
Plant Sciences
ISSN journal
00443263
Volume
159
Issue
2
Year of publication
1996
Pages
215 - 226
Database
ISI
SICI code
0044-3263(1996)159:2<215:TOHLHA>2.0.ZU;2-D
Abstract
Since increased Hg-concentrations in fish in lakes and rivers in north ern Europe, northern parts of the U.S.A. and Canada were found, enviro nmental Hg research has focused intensively on the factors determining leaching of mercury from soil into water systems. This article presen ts the results of a leaching experiment with undisturbed soil columns treated with HgCl2 and CH3HgCl using radio-analytical techniques. The columns were irrigated with rain of different acidity, rain volumes an d irrigation intensities. The leaching of mercury was traced volumes a nd irrigation intensities. The leaching of mercury was traced by detec ting the vertical distribution of Hg-203 in the soil profiles. Advanta ges and disadvantages of radioanalytical scanning techniques are discu ssed. The results of Hg leaching in the soil columns indicate a consid erably stronger leaching of monomethyl mercury compared to inorganic m ercury. Leaching of the two Hg-species is ruled by competition of H+ i nduced soil-Hg desorption with DOM-Hg complex formation; both being af fected by rain acidity. Rain intensity had no visible effect on leachi ng of Hg2+ and CH3Hg+. An extended rain duration increased the leachin g of CH3Hg+.