Determination of Copper in Aluminium Metals, Aluminium Alloys, and Steel by Atomic Absorption Spectrometry

Atomic absorption spectrometric determination of copper in aluminium alloys and steels was established, whereby a quite linear calibration curve was obtained for 0～40μg Cu/ml in 0.3～0.7N hydrochloric acid solution in the presence of aluminium (0.05～0.3 g/25 ml) and iron (0.1～0.5 g/25 ml). When the diethyldithiocarbamate-MIBK extraction was applied to the analysis of micro-amount of copper, the sensitivity of the method was ten-fold multiplied, and the 0.003% Cu in aluminium metal could be determined. The conditions recommended were as follows : wavelength 3247A, hollow cathode lamp current 30mA, slit width 0.025mm, air pressure 1.5kg/cm^2, and acetylene pressure 0.5kg/cm^2 for aqueous solution and 0.3kg/cm^2 for MIBK solution with the water cooling of the burner

Stabilization of the Plasma-Jet Flame and Determination of Aluminium and Boron in Steel

A stabilization of the plasma-jet flame was studied for the use of acid solutions, the apparatus was improved and working conditions for the determination of aluminium and boron in steel were examined. The coefficient of variation for the determination of aluminium (0.061%) in steel was 4.9%. These determinations are rather difficult by flame spectrometry or atomic absorption spectrometry using the usual combustion flame because of the formation of stable oxides of Al and B

Effect of Organic Solvents on Atomic Absorption Spectrometry

The effects of organic solvents on the sensitivity of atomic absorption spectrometry were investigated by using iron and magnesium as examples. The sensitivity increased remarkably when organic solvent was added to the sample solution. To clarify this effect, the feeding rates of sample solution into atomizer chamber and into flame were measured. The former rate was lower in the case of mixed solvent than aqueous solution, but the latter one was almost the same in both cases, because the atomization efficiency was greater when organic solvent was added to the sample solution. From these observations, the increase in sensitivity can be explained by the fact that the size of spray droplets is smaller when mixed solvent is used, and that species in droplets can be effectively dissociated into atomic state in flame

Increased Sensitivity of Atomic Absorption Analysis

In order to increase the sensitivity in atomic absorption spectrometry, many improvements, for example, those of light source, detector, flame and atomizer, were investigated. In addition to these improvements, it is asserted that the increased sensitivity of this kind of spectrometry by the addition of or the extraction with an organic solvent is one of the most interesting ideas from the point of analytical chemistry

Concurrent Determination of Magnesium and Calcium in Iron Ores by Atomic Absorption Spectroscopy

Examinations were made for the concurrent determination of magnesium and calcium in iron ores when present in about equal amounts, using the magnesium-calcium coupled type hollow-cathode lamp in atomic absorption spectroscopy, and a method of measurement was established. Concurrent determination was found to be easily possible by removal of the majority of iron by extraction with methyl isobutyl ketone and addition of strontium. Analytical precision was calculated and found to give satisfactory results (standard deviations : ±0.004% for Ca, ±0.006% for Mg)

A Study of Atomic Absorption Spectrometry : Determination of Magnesium and Calcium in Slag and Cast Iron

Atomic absorption-spectrometric determinations of magnesium and of calcium were carried out and the method was applied to the determination of magnesium and calcium in slag and to the determination of magnesium in cast iron. The absorbance for magnesium was measured at 2852A by using 30 mA of current of hollow cathode lamp, 1.1 kg/cm^2 of air pressure and 0.48 kg/cm^2 of acetylene gas pressure. That for calcium was measured at 4227A by using 50 mA of current of hollow cathode lamp, 1.1 kg/cm^2 of air pressure and 0.5 kg/cm^2 of acetylene gas pressure. Effects of diverse ions and acid concentrations were also examined. Aluminium, silicon and several other ions interfered with the atomic absorption of magnesium and calcium in flame, but those interferences were all eliminated by 1.5 mg/ml of strontium in the sample solution. These fundamental results were applied to the determination of magnesium and calcium in slag. Magnesium in cast iron was also determined by a standard addition method without any preliminary separation. The results were very accurate and highly reproducible

Determination of Micro Amount of Iron in Aluminium Metals and Aluminium Alloys by Atomic Absorption Spectrometry

application/pdfThe method of determination of iron by atomic absorption spectrometry was applied to the analysis of aluminium metals and alloys. The optimum conditions for the determination were as follows : the wavelength 2483 A, the current of the hollow cathode lamp for Fe 30 mA, the slit width 0.11 mm, air pressure 1.5 kg/cm^2, acetylene pressure 0.5 kg/cm^2. In the case of the atomizing after an extraction with MIBK, the optimum acetylene pressure was 0.3 kg/cm^2 with water-cooling of the burner. The presence of alloying elements and acids did not interfere except nickel, the interference of which varied with the anions present. A rapid method of the determination of 0.05～1.0% of iron in aluminium metals and alloys without any separation of main elements was established. Also, as small as 0.0005～0.01% of iron in high purity aluminium was determined after the extractive concentration of Fe with MIBK.紀要類(bulletin)departmental bulletin pape

Determination of Microamount of Zinc in Some Metals by Atomic Absorption Spectrometry

A rapid method for the determination of zinc in copper, lead and aluminium alloys by atomic absorption spectrometry was established, whereby a quite linear analytical curve was obtained for 0?10 μg Zn/ml in 0.5N hydrochloric acid or nitric acid solution in the presence of alloying elements. When oxine- or dithizone-methyl isobutyl ketone, and dithizone-chloroform extraction are applied to the analysis for microamount of zinc, the sensitivity of the method is tenfold multiplied ; and 0.0001?0.003% zinc in high purity lead metal, aluminium metal and electrolytic iron can be determined. The conditions recommended are as follows : wavelength 2138A ; hollow cathode lamp current 27.5mA ; slit width 0.3 mm ; pressure of air 1.5 kg/cm^2 ; pressure of acetylene 0.5 kg/cm^2 for aqueous solution and 0.3 kg/cm^2 for methyl isobutyl ketone solution with water-cooled burner

Determination of Manganese in Steels, Aluminium Alloys and Ferro-Alloys by Atomic Absorption Spectrometry

Atomic absorption spectrometric investigation of manganese was carried out and a method was applied to the determination of manganese in steels, aluminium alloys and ferro-alloys. The optimum conditions for the determination of manganese were as follows : the wave-length 2795A, the current of hollow cathode lamp for manganese 60 mA, the slit width 0.05mm, air pressure 1.5 kg/cm^2 and acetylene pressure 0.5 kg/cm^2. Influences of coexisting elements and acids were also examined. The alloying elements and acids except a large amount of molybdenum did not interfere. A rapid method for the determination of manganese in steels, aluminium alloys and ferro-alloys without any preliminary separation of main elements was established. The method is very accurate and highly reproducible

Fundamental Studies on Plasma-Jet Spectrometry

A plasma-jet generator as a new light source was described and various studies were carried out to obtain the optimum working conditions for emission spectrometry. The variation of spectral line intensity and the distribution of temperature in the plasma flame were examined. The background intensity was reduced and the sensitivity of the measurement increased by use of a mixture of argon and helium as tangential gas. It became possible to carry out the determination of aluminium, which was rather difficult by flame spectrometry and atomic-absorption spectrometry with the usual combustion flame because a stable oxide was formed in the flame. In addition, the detection limit was calculated and calibration curves were obtained with good linearity. Effects of acids and organic solvents were investigated, too