Plant Uptake of 2,4,6-Trinitrotoluene, 4-Amino-2,6-Dinitrotoluene, and 2-Amino-4,6-Dinitrotoluene Using 14C-Labeled and Unlabeled Compounds

摘要

Plant uptake of 2,4,6-trinitrotoluene (TNT) and two of its principal degradation products, 4-amino-2,6-dinitrotoluene (4ADNT) and 2-amino-4,6-dinitrotoluene (2ADNT), were investigated. TNT, 4ADNT, and 2ADNT were added to two soils: Tunica silt and Sharkey clay. The addition rate was 80 micrograms of the respective treatment compound per gram of soil on an oven-dry weight basis. TNT- and 4ADNT-treated soils received both 14C-labeled and unlabeled compounds. 2ADNT-treated soils received only unlabeled 2ADNT. Results indicated that TNT was degraded in the soil to 4ADNT and, to a lesser extent, to 2ADNT. 4ADNT and 2ADNT remained predominant in 4ADNT- and 2ADNT- treated soils, respectively. Plant uptake was greatest from 4ADNT-treated silt, but also occurred from TNT-treated silt and clay. No plant uptake of 2ADNT was observed. Percent recoveries of treatment compounds from soils by solvent extraction were much lower than expected. Recoveries obtained by complete combustion analysis were higher. Keywords: Yellow nutsedge, Cyrerus esculentus, Contaminants, Soil pollution. (aw)