Uptake and Transformation of Soil [C-14]-Trinitrotoluene by Cool-Season Grasses

作者：Duringer Jennifer M^*; Craig A Morrie; Smith David J; Chaney Rufus L

来源：Environmental Science & Technology, 2010, 44(16): 6325-6330.

DOI：10.1021/es903671n

This study investigated the fate and uptake of [C-14]-TNT from soil into orchardgrass (Dactylis glomerate), perennial ryegrass (Lolium perenne), and tall fescue (Festuca arundinacea) over a one year period in a greenhouse-controlled environment. Pots (n = 4 for each grass, containing 10 mg cold TNT/kg soil + 1.2 mg [C-14]-TNT/kg soil and controls with no TNT) were exposed to light and temperature conditions typical of June at 45 degrees N for 369 days Three plant harvests were made (63, 181, and 369 days), and soil and plant materials were monitored for [C-14]-TNT and metabolite concentrations The 11 2 mg/kg TNT dose was not phytotoxic to the plant species tested Continual uptake of TNT into grass blades was observed over the one-year period, with a total accumulation of 1.3%, 0.9%, and 0.8% of the initial soil [C-14]-TNT dose for orchard grass, perennial ryegrass, and tall fescue, respectively All [C-14]-TNT residue in plant material was incorporated as bound residue. At final harvest, radioactivity was concentrated most highly in the root > crown > blade for all species Soil TNT was gradually reduced to aminodinitro-toluenes and then further to an unidentified metabolite(s) Overall, orchardgrass appeared to be the most efficient species at taking up TNT.

• 出版日期2010-8-15