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Leaching of contaminated leaves following uptake and phytoremediation of RDX, HMX, and TNT by poplar.

Identifieur interne : 003D85 ( Main/Exploration ); précédent : 003D84; suivant : 003D86

Leaching of contaminated leaves following uptake and phytoremediation of RDX, HMX, and TNT by poplar.

Auteurs : Jong Moon Yoon [États-Unis] ; Benoit Van Aken ; Jerald L. Schnoor

Source :

RBID : pubmed:16615309

Descripteurs français

English descriptors

Abstract

The uptake and fate of 2,4,6-trinitrotoluene (TNT), hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) by hybrid poplars in hydroponic systems were compared and exposed leaves were leached with water to simulate potential exposure pathways from groundwater in the field. TNT was removed from solution more quickly than nitramine explosives. Most of radioactivity remained in root tissues for 14C-TNT, but in leaves for 14C-RDX and 14C-HMX. Radiolabel recovery for TNT and HMX was over 94%, but that of RDX decreased over time, suggesting a loss of volatile products. A considerable fraction (45.5%) of radioactivity taken up by whole plants exposed to 14C-HMX was released into deionized water, mostly as parent compound after 5 d of leaching. About a quarter (24.0%) and 1.2% were leached for RDX and TNT, respectively, mostly as transformed products. Leached radioactivity from roots was insignificant in all cases (< 2%). This is the first report in which small amounts of transformation products of RDX leach from dried leaves following uptake by poplars. Such behavior for HMX was reported earlier and is reconfirmed here. All three compounds differ substantially in their fate and transport during the leaching process.

DOI: 10.1080/15226510500507128
PubMed: 16615309


Affiliations:


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Le document en format XML

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<title xml:lang="en">Leaching of contaminated leaves following uptake and phytoremediation of RDX, HMX, and TNT by poplar.</title>
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<name sortKey="Yoon, Jong Moon" sort="Yoon, Jong Moon" uniqKey="Yoon J" first="Jong Moon" last="Yoon">Jong Moon Yoon</name>
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<nlm:affiliation>Department of Civil and Environmental Engineering, The University of Iowa, Iowa City, Iowa 52242, USA.</nlm:affiliation>
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<term>Heterocyclic Compounds, 1-Ring (analysis)</term>
<term>Heterocyclic Compounds, 1-Ring (pharmacokinetics)</term>
<term>Humans (MeSH)</term>
<term>Industrial Waste (analysis)</term>
<term>Plant Leaves (metabolism)</term>
<term>Plant Roots (metabolism)</term>
<term>Plant Stems (metabolism)</term>
<term>Populus (metabolism)</term>
<term>Soil Pollutants (analysis)</term>
<term>Soil Pollutants (pharmacokinetics)</term>
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<term>Déchets industriels (analyse)</term>
<term>Dépollution biologique de l'environnement (MeSH)</term>
<term>Feuilles de plante (métabolisme)</term>
<term>Humains (MeSH)</term>
<term>Polluants du sol (analyse)</term>
<term>Polluants du sol (pharmacocinétique)</term>
<term>Populus (métabolisme)</term>
<term>Racines de plante (métabolisme)</term>
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<term>Plant Stems</term>
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<term>Racines de plante</term>
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<div type="abstract" xml:lang="en">The uptake and fate of 2,4,6-trinitrotoluene (TNT), hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) by hybrid poplars in hydroponic systems were compared and exposed leaves were leached with water to simulate potential exposure pathways from groundwater in the field. TNT was removed from solution more quickly than nitramine explosives. Most of radioactivity remained in root tissues for 14C-TNT, but in leaves for 14C-RDX and 14C-HMX. Radiolabel recovery for TNT and HMX was over 94%, but that of RDX decreased over time, suggesting a loss of volatile products. A considerable fraction (45.5%) of radioactivity taken up by whole plants exposed to 14C-HMX was released into deionized water, mostly as parent compound after 5 d of leaching. About a quarter (24.0%) and 1.2% were leached for RDX and TNT, respectively, mostly as transformed products. Leached radioactivity from roots was insignificant in all cases (< 2%). This is the first report in which small amounts of transformation products of RDX leach from dried leaves following uptake by poplars. Such behavior for HMX was reported earlier and is reconfirmed here. All three compounds differ substantially in their fate and transport during the leaching process.</div>
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