TY - THES TI - Analytical applications of N-phenyl-n-butyro hydroxamic and N-p-tolyl-n-butyro hydroxamic acids towards chromium (VI), copper (II), iron (III) and uranium (VI) AB - Two aliphatic hydroxamic acids were prepared; N-phenyl-n-butyro hydroxamic acid and N-p-tolyl-n-butyro hydroxamic acid, by the reaction of {beta}-phenylhydroxylamine and p-tolyl hydroxylamine with n-butyryl chloride. The acids were identified by: their melting points, characteristic reactions with acidic solutions of vanadium (V) and iron (III), infrared spectroscopy, nitrogen content and molecular weight determination. The extractability of these acids towards Cr (VI), Cu (II), Fe (III) and U (VI) were investigated at different pH values and molar acid concentrations. N-phenyl-n- butyro hydroxamic acid has a maximum extraction (98.80%) for Cr (VI) at 4 M H{sub 2}SO{sub 4}, (83.25%) for Cu (II) at pH 6, (99.17%) for Fe (III) at pH 5 and (99.76%) at 4 M HNO{sub 3} for U (VI) respectively. N-p-tolyl-n-butyro hydroxamic acid has a maximum extraction (98.40%) for Cr (VI)at 4 M H{sub 2} SO{sub 4}, (81.30%) for Cu (II) at pH 6, (92.80%) for Fe (III) at pH 5 and (99.64%) for U (VI) at 4 M HNO{sub 3}, respectively. The ratios of the metal to ligands were determined by job method (continuous variation method) and were found to be 1:2 for Cr (VI) and U (VI). (Author) AU - "Elkhadir, A Y. F. [Department of Chemistry, Faculty of Science, University of Khartoum, Khartoum (Sudan)]" KW - "37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY" KW - "CHEMICAL PREPARATION" KW - "CHROMIUM" KW - "CONCENTRATION RATIO" KW - "COPPER" KW - "EXTRACTION" KW - "HYDROXAMIC ACIDS" KW - "IRON" KW - "LIGANDS" KW - "METALS" KW - "NUMERICAL DATA" KW - "QUALITATIVE CHEMICAL ANALYSIS" KW - "SPECTROPHOTOMETRY" KW - "URANIUM" DO - https://doi.org/ UR - https://www.osti.gov/etdeweb/servlets/purl/20655573 PB - Khartoum (Sudan) CY - Sudan PY - 2001 DA - 2001-05-01 LA - English J2 - [] VL - C1 - University of Khartoum, Khartoum (Sudan) C2 - C3 - INIS-SD-275 C4 - C5 - Available from INIS in electronic form; Also available from Sudan Atomic Energy Commission, Khartoum (SD) L3 - Other Information: 111 refs., 17 tabs., 15 figs,. 2 app ER -