Atomic absorption analysis of ferrites

Abstract

Two important conclusions can be drawn from this study: that potassium iodate is stable in the melt at this temperature for periods of at least hours, and that a method has been developed which can be used to determine iodate (and other stable positive oxidation states of iodine) sampled from tMs fused salt medium. and would, therefore, introduce positive errors in the analyses. Table I presents the data obtained for the determination of potassium iodate in the eutectic melt by this method. With reference to column 3, the relative error in the analyses is about 1 %. However, because duplicate aliquots generally agreed to-within a few tenths of one per cent, the error observed most probably reflects the difficulty in measuring the total volume of the melt (-100 ml) and is not a result of errors inherent in the method.

22-Hydroxycholesterol derivatives as HMG CoA reductase suppressors and serum cholesterol lowering agents

“…25 (44) While (diethylamino)sulfur trifluoride has been purified via distillation on several occasions without incident, explosions have been reported with this reagent during this process. 46 We have since found that the crude reagent works equally as well as the distilled compound in this reaction. (45) Cochran, J. Chem.…”

“…Cholesterol levels were determined by using the Liebermann-Burchard method on a Technicon autoanalyzer. 46 Lipoprotein levels were determined by densiometric analysis of lipoprotein fractions separated by disc gel electrophoresis using a Quick-Disc Lipoprotein Gel Tube Kit (Ames Co.) and a Clifford Model 750 Densitometer (Medfield, Mass. ).37 The values listed in Table III were analyzed by using a Student's t test and are accompanied by the standard error of the mean (SEM).…”