Fate of RDX and TNT in agronomic plants.
Phytoremediation is of great interest to remediate soil contaminated with hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) and 2,4,6-trinitrotoluene (TNT). The ability of 4 agronomic plants (maize, soybean, wheat and rice) to take up these explosives and their fate in plants were investigated. Plants were grown for 42 days on soil contaminated with [(14)C]RDX or [(14)C]TNT. Then, each part was analyzed for its radioactivity content and the percentage of bound and soluble residues was determined following extractions. Extracts were analyzed by radio-HPLC. More than 80% of uptaken RDX was translocated to aerial tissues, up to 64.5 mgg(-1) of RDX. By contrast, TNT was little translocated to leaves since less than 25% of uptaken TNT was accumulated in aerial parts. Concentrations of TNT residues were 20 times lower than for RDX uptake. TNT was highly metabolized to bound residues (more than 50% of radioactivity) whereas RDX was mainly found in its parent form in aerial parts.
Vila
M
M
INRA, UMR1089 Xénobiotiques, Toulouse, France.
Lorber-Pascal
S
S
Laurent
F
F
D000383:Agriculture; D001692:Biological Transport; D012275:Oryza; D018517:Plant Roots / Q000378:metabolism; D018520:Plant Shoots / Q000378:metabolism; D010945:Plants, Edible / Q000378:metabolism*; D012989:Soil Pollutants / Q000378:metabolism*; D013025:Glycine max; D014227:Triazines / Q000378:metabolism*; D014303:Trinitrotoluene / Q000378:metabolism*; D014908:Triticum; D003313:Zea mays
D012989:Soil Pollutants; D014227:Triazines; D014303:Trinitrotoluene; C009160:cyclonite