Stability Studies on the Chemical and Biological Activity of Coal-Derived Liquids

摘要

After four years of storage, no chemical composition or mutagenicity changes occurred in the 17 SRC materials stored in the repository under controlled conditions. The integrity of the samples has been maintained at 4 exp 0 C, in inert containers, in the dark, under a nitrogen atmosphere. After one year of storage of SRC II fuel oil blend (FOB) samples at room temperatures under various parameters of ambient light, cover atmosphere, and dilution, no gross chemical composition changes occurred except when diluted in methylene chloride, in the light, under an air atmosphere. Under these conditions, hydroxylated PAH such as the cresols and indanol decomposed. Also, hydrogenated PAH such as unsubstituted and alkylated indans and tetralins decomposed. Mutagenicity of the FOB was significantly decreased or eliminated when stored both diluted and undiluted at room temperature for one year under an air atmosphere in ambient light. Mutagenicity decreased when no gross chemical compositional changes were noted due to trace component degradation, probably primary aromatic amines. After 32 weeks of storage at 60 exp 0 C, hydroxylated PAH such as o-cresol and indanol degraded in the FOB. Hydrogenated PAH such as alkylated indans also showed a significant decrease. Mutagenicity was completed eliminated under these harsh storage conditions. A more complete discussion of effects of storage under increased temperature on the nitrogen-containing polycyclic aromatic compounds present in the FOB is forthcoming. 13 references, 5 tables. (ERA citation 09:025245)