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REPORT DATE (DD-MM-YYYY)XX-07-2013
REPORT TYPE
AUTHOR(S)Simini, Michael; Checkai, Ronald T.; Kuperman, Roman G.; Phillips, Carlton T.; Kolakowski, Jan E.; and Kurnas, Carl W.
PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Director, ECBC, ATTN: RDCB-DRT-E, APG, MD 21010-5424
PERFORMING ORGANIZATION REPORT NUMBER
ECBC-TR-1091
SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES)Strategic Environmental Research and Development Program 4800 Mark Center Drive, Suite 17D08, Alexandria, VA 22350-3605
SPONSOR/MONITOR'S ACRONYM(S)
SERDP
SPONSOR/MONITOR'S REPORT NUMBER(S)
DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution is unlimited.
SUPPLEMENTARY NOTES
ABSTRACT-LIMIT 200 WORDSThis study was designed to produce scientifically defensible benchmark data for the development of ecological-based soil screening levels for 2,4,6-trinitrotoluene (TNT) and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) for terrestrial plants. The physical and chemical properties of different soils may alter the bioavailability and toxicity of TNT and RDX to plant species. We investigated individual ecotoxicities of TNT and RDX to alfalfa (Medicago sativa L.), Japanese millet (J. millet; Echinochloa crus-galli L. [Beauv.]), and perennial ryegrass (Lolium perenne L.) in five natural soils that varied in pH, organic matter, and clay contents. On the basis of EC 50 values (the TNT or RDX concentrations that produce 50% reductions in selected measurement endpoints) and 95% confidence intervals for shoot fresh and dry masses (SDM), TNT weathered-and-aged (W-A) in soils significantly reduced (p < 0.05) growth of alfalfa, J. millet, and perennial ryegrass. RDX W-A in soil was moderately inhibitory to growth of J. millet and perennial ryegrass in all five soils but did not affect growth of alfalfa. No statistically significant correlations between TNT toxicity and these soil properties were identified; however, statistically significant (p < 0.05) inverse relationships were identified between the RDX EC 50 values for perennial ryegrass SDM and soil clay content and pH.