TY - THES TI - Study of the effect of gamma radiation on the molecule of tetracycline concerning its behavior as complexing and extracting agent; Estudo do efeito da radiacao gama sobre a molecula de tetraciclina relativamente ao seu comportamento como agente complexante e extrator AB - Both solvent extraction and spectrophotometric techniques were used to show the alterations that gamma radiation causes in the behavior of tetracycline molecule as far as its extracting and complexing power are concerned. The effect of gamma radiation on the solid tetracycline molecule, benzyl alcohol and on the solution of both was examined in solvent extraction systems whose aqueous phases were made up by {sup 152} Eu-{sup 154}Eu radioactive tracer solutions and whose organic phases were constituted by tetracycline-benzyl alcohol solutions. Experiments were performed in order to determine whether or not the water used for the pre-saturation of benzyl alcohol would influence the radiolysis of tetracycline. Solvent extraction and spectrophotometry were the techniques used to obtain the necessary data. Absorption spectra of irradiated tetracycline benzyl alcohol solutions submitted to several gamma radiation doses were examined and the alterations shown by these spectra were examined. The effect of gamma radiation on the tetracycline molecule was also studied when tetracycline-benzyl alcohol solutions were irradiated under several gaseous atmospheres, namely: O{sub 2}, N{sub 2}, SF{sub 6} and N{sub 2}O. The variation on the concentration of the tetracycline-benzyl alcohol solution caused by several doses of gamma radiation was determined by using the spectrophotometric technique. (author) AU - "Andrade e Silva, Leonardo Gondim de" KW - "38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY" KW - "BENZYL ALCOHOL" KW - "CHELATING AGENTS" KW - "CHEMICAL RADIATION EFFECTS" KW - "DISSOLUTION" KW - "EUROPIUM 152" KW - "EUROPIUM 154" KW - "EXTRACTION APPARATUSES" KW - "FLUORINE" KW - "GAMMA RADIATION" KW - "GAMMA SOURCES" KW - "GAMMA SPECTRA" KW - "MIST EXTRACTORS" KW - "NITROGEN" KW - "OXYGEN" KW - "PHOTONS" KW - "SOLVENT EXTRACTION" KW - "SULFUR" KW - "SULFUR FLUORIDES" KW - "TETRACYCLINES" KW - "TRACER TECHNIQUES" KW - "X RADIATION" DO - https://doi.org/ UR - https://www.osti.gov/etdeweb/servlets/purl/21216080 PB - CY - Brazil PY - 1982 DA - 1982-07-01 LA - Portuguese J2 - [] VL - C1 - Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil) C2 - C3 - INIS-BR-5651 C4 - C5 - Available from INIS in electronic form L3 - Other Information: TH: Tese (Ph.D.); 47 refs., 27 figs., 13 tabs ER -