A 2449 MHz torch discharge was used at 300 to 500 W as an excitation source for spectrochemical analysis of copper.The spectra were measured photoelectrically.The sample was put on a graphite electrode.Nebulized pure water was supplied to the discharge with argon as the carrier gas.Feeding rates of argon gas and pure water were 5.3
l/min and 0.22 g/min, respectively.The stability and the reproducibility of the intensity of the line CuIλ 3247.5Å were as good as 3 and 4%, respectively.The intensity of the line FeIλ 3719.9Å was so stable that the fluctuation in it was as low as 4%, while the intensity of the line PbI λ 4057.8Å decreased with time.The detection limits for iron and lead in copper were 1 ppm and less than 1 ppm, respectively.
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