Soils amended with [14C]hexahydro‐1,3,5‐trinitro‐1,3,5‐triazine (RDX) were sampled over 60 d and subjected to exhaustive Soxhlet extraction followed by HPLC analysis. RDX was the only radiolabeled compound observed in soil extracts. Emission of volatile organics and 14CO2 from soil accounted for only 0.31% of the amended radiolabel. Mass balance for RDX‐amended soil was better than 84% throughout the two‐month study. The analytical method developed for plants involved acid hydrolysis, solvent extraction, fractionation on Florisil® adsorbent and separation by HPLC. The described methodology allowed for RDX recovery of 86 ± 3% from fortified bush bean leaf tissue. Further experiments were conducted with bush bean plants maintained on RDX‐containing hydroponic solutions. Hydroponic plants did not emit detectable amounts of 14CO2 or radiolabeled volatile organics. Analysis of the plant tissue indicated bioaccumulation of RDX in the aerial tissues of hydroponic plants exposed for either 1 or 7 d. Metabolism of RDX to polar metabolites was observed in plants exposed for 7 d.

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No abstract

A suite of physical and chemical analyses has been performed in support of activities directed toward the resolution of an Unreviewed Safety Question concerning the potential for a floating organic layer in Hanford waste tank 241-C-103 to sustain a pool fire. The analysis program was the result of a Data Quality Objectives exercise conducted jointly with staff from Westinghouse Hanford Company and Pacific Northwest Laboratory (PNL). The organic layer has been analyzed for flash point, organic composition including volatile organics, inorganic anions and cations, radionuclides, and other physical and chemical parameters needed for a safety assessment leading to the resolution of the Unreviewed Safety Question. The aqueous layer underlying the floating organic material was also analyzed for inorganic, organic, and radionuclide composition, as well as other physical and chemical properties. This work was • conducted to PNL Quality Assurance impact level III standards (Good Laboratory Practices).°.°1 Peroxides Less than 2.5 gEquivalent/g Nitroalkanes No indication of nitroalkanes by RSST(a) experiment; less than 2 [tmol/g by infrared analysis Density 0.876 g/mL at 25°C, 0.868 g/mL at 44°C Viscosity 4 cP at 25°C, 2.5 cP at 40°C Gross alpha, beta Alpha = 547 pCi/g Beta = 1.05 x 106 pCi/[g 90Sr 5.5 x 105 pCi/g Alpha emitters 238pu = 90.2, 239+240pu = 194, 241Am = 179 (pCi/[g) Gamma emitters 6°Co = 7.45 x 10-4, 137Cs = 4.13 x 10-2, 154Eu = 3.17 x 10"4, 155Eu = 3.15 x 10.4' 241Am = 2.11 x 10.4 (_tCi/[g) aa Water content 1.31 wt% Ammonia 24 lxg NH3/g IC F, Cl, NO2, NO3, SO4, all <50 _tg/g ICP/AES Ag = 0.90, Al = 1.8, B = 11, Ca = 2.0, (2% HNO3 leach) Cd = 2.1, Cu = 2.2, Fe = 0.33, Na = 70, Ni = 9.9, P = 605 (_t_g) (a) RSST = Reactive system screening tool vi Contents