Spektrochemische bestimmung der hauptbestandteile von Cu-Al-binärlegierungen mit der glimmentladungslampe als lichtquelle

The suitability of the glow discharge lamp for the analysis of both main components of a binary system Cu-Al has been investigated. The standard samples contained Cu and Al between 0.5 and 99.5%. Different calibration methods for these systems are discussed. Only the “method of binary ratios” yields a straight line for calibration within the entire concentration range. It is obtained if the logarithm of the intensity ratio is plotted against the logarithm of the concentration ratio of Cu and Al. Accurate and precise results are obtained if the discharge voltage and the gas pressure are kept constant for all samples. The correlation coefficient was found to be 0.99986 and the relative standard deviation for the determination of the concentration was about 0.06 · (1-w), where w is the concentration expressed as a fraction.