Abstract
Certain features of ordinary combined discharges which represent the superposition on a burning d.c. arc of an impulse discharge; and double combined discharges when two impulse discharges with a controlled time interval between them are imposed on a burning d.c. arc were studied. Spectra of electrode material and of dried residue sample (dry residue of CuSO 4·5H 2O solution) excited using these discharges are compared. The utilisation of the combined discharge source for the determination of ordinary (Se, P, As, Zn) and “poorly excited” (Cl) elements and a special case—the determination of boron isotopic composition are also discussed.
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