Dynamics of Cu, Zn, Cd, and Hg release from sediments at
surface conditions

J 2004

Dynamics of Cu, Zn, Cd, and Hg release from sediments at surface conditions

KOMÁREK, Martin a Josef ZEMAN

Základní údaje

Originální název

Dynamics of Cu, Zn, Cd, and Hg release from sediments at surface conditions

Název česky

Dynamika uvolňování Cu, Zn, Cd a Hg ze sedimentů za povrchových podmínek

Autoři

KOMÁREK, Martin (203 Česká republika) a Josef ZEMAN (203 Česká republika, garant)

Vydání

Bulletin of Geosciences, Praha, Czech Geological Survey, 2004, 1214-1119

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

Geochemie

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Odkazy

http://www.geology.cz/bulletin/contents/2004/vol79no2

Kód RIV

RIV/00216224:14310/04:00036716

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova česky

průtočný reaktor, interakce, geochemické modelování, dynamika uvolňování těžkých kovů, rozpouštění kalcitu

Klíčová slova anglicky

flowthrough reactors sequential analysis system sediment-water interactions geochemical modeling dynamics of heavy metal release

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 30. 9. 2009 14:28, doc. RNDr. Josef Zeman, CSc.

Anotace

ORIG CZ

V originále

Sediments and soils have a high capacity for binding heavy metals from contaminated waters. However, these sediments become a potential source of water contamination by subsequently releasing the metals into the water when environmental conditions change. Samples of typical sediments from the Vienna Basin were collected for the experimental study of Cu, Cd, Zn, and Hg release from sediments to water. These sediments were characterized using chemical analysis, XRD analysis, the measurement of sediment sorption parameters, grain and pore analysis, and sequential analysis. Initially, a set of sediment samples was placed into batch reactors, each containing 0.1Msolution of CuSO4, CdSO4, ZnSO4, or HgCl2, and kept there for two months. These artificially contaminated sediments were subsequently leached by distilled water in flow-through reactors. Described experiments show that a significant proportion of the metal remains strongly bound to the sediment after the leaching process, suggesting that the reactions by which they are bound to the sediment are not completely reversed. The rate of metal release is significantly affected by sediment composition and bond type. Geochemical modeling and sequential analysis have confirmed that the metals are not only bound to sediments by sorption, but also by the precipitation of secondary minerals such as brochantite, tenorite (Cu2+), hydrozincite (Zn2+), and otavite (Cd2+). Significant quantities of the metals are releasable from the sediments only in extreme conditions (Cd, Zn, and Cu in strongly acidic reducing conditions, and Hg in acidic oxidizing conditions). The presence of calcite in the sediment decreases the rate of Hg, Zn and Cu release through pH buffering by calcite dissolution (in solutions with pH values ranging from 7 to 7.5). Under these conditions the metals are not released, and can remain bound to the sediment.

Česky

Sedimenty a půdy mají vysokou kapacitu pro vazbu těžkých kovů z kontaminovaných vod. Vybrané sedimenty byly charakterizovány a podrobeny laboratorním sorpčním experimentům. V závislosti na složení sedimentu dochází k významnému záchytu těžkých kovů.

Citovat

KOMÁREK, Martin a Josef ZEMAN. Dynamics of Cu, Zn, Cd, and Hg release from sediments at surface conditions. Bulletin of Geosciences. Praha: Czech Geological Survey, 2004, roč. 79, č. 2, s. 99-106. ISSN 1214-1119.

@article{847874,
   author = {Komárek, Martin and Zeman, Josef},
   article_location = {Praha},
   article_number = {2},
   keywords = {flowthrough reactors sequential analysis system sediment-water interactions geochemical modeling dynamics of heavy metal release},
   language = {eng},
   issn = {1214-1119},
   journal = {Bulletin of Geosciences},
   title = {Dynamics of Cu, Zn, Cd, and Hg release from sediments at surface conditions},
   url = {http://www.geology.cz/bulletin/contents/2004/vol79no2/bullgeosci200402099.pdf},
   volume = {79},
   year = {2004}
}

TY  - JOUR
ID  - 847874
AU  - Komárek, Martin - Zeman, Josef
PY  - 2004
TI  - Dynamics of Cu, Zn, Cd, and Hg release from sediments at surface conditions
JF  - Bulletin of Geosciences
VL  - 79
IS  - 2
SP  - 99-106
EP  - 99-106
PB  - Czech Geological Survey
SN  - 12141119
KW  - flowthrough reactors sequential analysis system sediment-water interactions geochemical modeling dynamics of heavy metal release
UR  - http://www.geology.cz/bulletin/contents/2004/vol79no2/bullgeosci200402099.pdf
N2  - Sediments and soils have a high capacity for binding heavy metals from contaminated waters. However, these sediments become a potential source of water contamination by subsequently releasing the metals into the water when environmental conditions change. Samples of typical sediments from the Vienna Basin were collected for the experimental study of Cu, Cd, Zn, and Hg release from sediments to water. These sediments were characterized using chemical analysis, XRD analysis, the measurement of sediment sorption parameters, grain and pore analysis, and sequential analysis. Initially, a set of sediment samples was placed into batch reactors, each containing 0.1Msolution of CuSO4, CdSO4, ZnSO4, or HgCl2, and kept there for two months. These artificially contaminated sediments were subsequently leached by distilled water in flow-through reactors. Described experiments show that a significant proportion of the metal remains strongly bound to the sediment after the leaching process, suggesting that the reactions by which they are bound to the sediment are not completely reversed. The rate of metal release is significantly affected by sediment composition and bond type. Geochemical modeling and sequential analysis have confirmed that the metals are not only bound to sediments by sorption, but also by the precipitation of secondary minerals such as brochantite, tenorite (Cu2+), hydrozincite (Zn2+), and otavite (Cd2+). Significant quantities of the metals are releasable from the sediments only in extreme conditions (Cd, Zn, and Cu in strongly acidic reducing conditions, and Hg in acidic oxidizing conditions). The presence of calcite in the sediment decreases the rate of Hg, Zn and Cu release through pH buffering by calcite dissolution (in solutions with pH values ranging from 7 to 7.5). Under these conditions the metals are not released, and can remain bound to the sediment.
ER  -

KOMÁREK, Martin a Josef ZEMAN. Dynamics of Cu, Zn, Cd, and Hg release from sediments at surface conditions. \textit{Bulletin of Geosciences}. Praha: Czech Geological Survey, 2004, roč.~79, č.~2, s.~99-106. ISSN~1214-1119.

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