| Popis: |
Stability studies performed on seventeen SRC samples in boiling point from ambient to 850/sup 0/F showed that the major chemical composition of the materials as monitored by high resolution gas chromatography did not change under the storage conditions of the repository, which were 4/sup 0/C, in inert containers, under a nitrogen atmosphere, in the dark. Samples were monitored after two years of storage. It was also found from microbial mutagenicity studies that after four years in the repository there was no significant change in the biological activity of any of the SRC materials. Samples stored under various parameters of air versus nitrogen atmosphere and ambient light versus darkness at room temperature and -20/sup 0/C for one year showed there was no significant differences in the chemical composition of any of the samples. There was evidence, however, that trace components such as amino-PAH degraded at room temperature, in the light, under an air atmosphere since the microbial mutagenicity of samples stored under these conditions for one year decreased significantly. Both the chemical composition and mutagenicity of FOB samples changed when stored diluted in methylene chloride, in the light, under an air atmosphere at room temperature. After one year of storage undermore » these conditions, the microbial mutagenicity was eliminated. Storage of SRC-II FOB at increased temperatures of 60/sup 0/C and 100/sup 0/C showed significant changes in chemical composition due to volatility effects. The microbial mutagenicity of the FOB samples was completely eliminated after storage at 60/sup 0/C for 32 weeks and 100/sup 0/C for 26 weeks. It appears that the amino-PAH and phenolic materials are the most susceptible components to degradation in the complex SRC materials. 23 references, 29 figures, 50 tables.« less |
