Adsorption of copper and cadmium from aqueous solution by various types of sediments under static and dynamic conditions
| Autoři | |
|---|---|
| Rok publikování | 2003 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | Bulletin of Geosciences |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | http://nts2.cgu.cz/servlet/page?_pageid=245,247,273&_dad=portal30&_schema=PORTAL30&453_TOC_140721.p_subid=71882&453_TOC_140721.p_sub_siteid=33&453_TOC_140721.p_edit=0 |
| Obor | Geochemie |
| Klíčová slova | Cu; Cd; adsorption; isotherm; soil; leaching column; sequential extraction analysis |
| Popis | Themobilityofheavymetalsinsedimentsandsoilsdependsstronglyonphysicalpropertiesandchemicalandmineralogicalcompositionofsuchenvironments.Fivetypesofsampleswithdifferentamountsofcarbonates,organicmatter,chemicalcompositionandvariousgrainsizeswerecho-sen.ExperimentalsorptiondatafrombatchtestswereevaluatedbyLangmuirandFreundlichtypeisotherms,whichprovidedmainsorptioncharacteris-ticsofsedimentsamplesforheavymetals(Cu,Cd).Inordertosimulatenaturalconditionsmorerealistically,severalleachingcolumntestswerealsoper-formed.Thesamplesorptioncapacitiesunderstaticanddynamicconditionswereevaluated.AllchosensamplesbondedCumoreefficientlyandfirmlythanCd.Distilledwaterwashedoutabout6%ofCuand44%ofCdfromHBS2(quartz-dominatedsamplewith74wt%ofsand-sizedfraction)and6%ofCuand9%ofCdfromHBS6(finer-grainedsamplewithsomeamountoforganicmatterandcarbonates).Carbonatesprovedtobecrucialforthemo-bilityofheavymetalsinnaturalsamples.Freemetalswerewashedoutofporesattheverybeginningofthedesorptionexperiments.Then,weaklyad-sorbedmetals(electricdoublelayer)werewashedoutandfinally,alowstationarymetalconcentrationwasestablished.Suchbehaviourshouldresultinaslow release of small amounts of a heavy metal, which should therefore not represent significant danger to the environment |
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