. "2014-01-30+01:00"^^ . . "1"^^ . "1"^^ . . "\u0158e\u0161en\u00ED projektu prob\u011Bhlo podle projektov\u00E9 p\u0159ihl\u00E1\u0161ky."@cs . . " precipitation" . . " surface" . . "Arsen deponovan\u00FD v p\u016Fd\u00E1ch poch\u00E1z\u00ED z infiltruj\u00EDc\u00EDch kysel\u00FDch de\u0161\u0165\u016F, kter\u00FDmi byly vym\u00FDv\u00E1ny z atmosf\u00E9ry produkty antropogenn\u00EDch aktivit (spalov\u00E1n\u00ED uhl\u00ED, hutnictv\u00ED a metalurgie, v\u00FDroba hnojiv, insekticidy a pesticidy obsahuj\u00EDc\u00ED arsen), jin\u00FDm mo\u017En\u00FDm zdrojem je p\u0159irozen\u00E9 zv\u011Btr\u00E1v\u00E1n\u00ED sulfidov\u00FDch miner\u00E1l\u016F (pyrit, arsenopyrit) z podlo\u017E\u00ED. V p\u016Fdn\u00EDch profilech se arsen vyskytuje p\u0159edev\u0161\u00EDm ve form\u011B oxoaniont\u016F (arseni\u010Dnany, arsenitany), selektivn\u011B v\u00E1z\u00E1n\u00FDch na hydratovan\u00E9 oxidy a oxidy hydroxidy \u017Eeleza (HFO), p\u0159\u00EDpadn\u011B na obdobn\u00E9 f\u00E1ze hlin\u00EDku a manganu. D\u00EDky vysok\u00FDm obsah\u016Fm HFO p\u0159edstavuj\u00ED pr\u00E1v\u011B p\u016Fdy a dnov\u00E9 sedimenty nejrozs\u00E1hlej\u0161\u00ED akumul\u00E1tory arsenu v \u017Eivotn\u00EDm prost\u0159ed\u00ED. Po roce 2000 do\u0161lo na n\u011Bkter\u00FDch st\u0159edoevropsk\u00FDch toc\u00EDch a\u017E ke \u010Dty\u0159n\u00E1sobn\u00E9mu zv\u00FD\u0161en\u00ED obsahu arsenu. Tento trend neodpov\u00EDd\u00E1 v\u00FDrazn\u00E9mu poklesu emis\u00ED (v\u010Detn\u011B arsenov\u00FDch), ke kter\u00E9mu do\u0161lo v\u00A0posledn\u00EDch dvaceti letech prakticky v\u00A0cel\u00E9 Evrop\u011B. Zv\u00FD\u0161en\u00E9 koncentrace arsenu v povrchov\u00FDch vod\u00E1ch souvisej\u00ED se zv\u00FD\u0161en\u00EDm pH infiltruj\u00EDc\u00EDch sr\u00E1\u017Eek a s n\u00E1sledn\u00FDm poklesem stability povrchov\u00FDch vazeb Fe-As (rozlo\u017Een\u00ED povrchov\u00E9ho n\u00E1boje, p\u0159\u00EDtomnost konkuren\u010Dn\u00EDch iont\u016F na sorp\u010Dn\u00ED m\u00EDsta). C\u00EDlem p\u0159edkl\u00E1dan\u00E9ho projektu je vysv\u011Btlit a kvantifikovat mobilitu arsenu v oxida\u010Dn\u00ED nenasycen\u00E9 z\u00F3n\u011B v z\u00E1vislosti na chemismu infiltruj\u00EDc\u00ED vody a povrchov\u00FDch vlastnostech pevn\u00E9 f\u00E1ze v p\u016Fdn\u00EDm profilu. \u00A0" . " soil" . "Effect of irrigation and precipitation to arsenic mobility in soils"@en . "arsenic; mobility; soil; precipitation; irrigation; surface; binders"@en . . " mobility" . . "Project was fulfilled according project proposal."@en . . "2012-03-30+02:00"^^ . . . . "12"^^ . "2010-01-01+01:00"^^ . "12"^^ . " irrigation" . . "Arsenic in soils originates either from the former acid deposition as an anthropogenic product (coal combustion, metallurgy, smelter and tannery industry, fertlizers, arsenic-based insecticides and pesticides), or from the weathering of sulfide minerals (pyrite, arsenopyrite) in the bedrock. In soil profiles arsenic in oxyanionic form (arsenates, arsenites) is selectively adsorbed on hydrated ferric oxides (HFO) and similar Al/Mn phases, forming stable surface complexes. Owing to a high content of mentioned HFO phases, soils and bottom sediments represent the most wide-spread accumulators of arsenic in the environment. A significant increase of arsenic in surface water (even four times during the last ten years), which has been noted in several Central European regions, has not corresponded with the global decline of atmospheric pollutions in all European countries. A higher As concentration in surface water relates with the increasing pH of infiltrated atmospheric deposition and/or with the decreasing stability of surface Fe-As binders connecting to the distribution of surface charge and presence of competitive ions to adsorption sites. The aim of proposal project is to explain and quantify the mobilization of arsenic in aerated unsaturated zone in dependence on the chemical properties of percolating water and the surface properties of solid phase in soil profiles."@en . "http://www.isvav.cz/projectDetail.do?rowId=GAP210/10/0938"^^ . . "2012-12-31+01:00"^^ . . "GAP210/10/0938" . "Vliv zavla\u017Eov\u00E1n\u00ED a sr\u00E1\u017Eek na mobilitu arsenu v p\u016Fdn\u00EDm profilu" . . . . "0"^^ . "arsenic" . .