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Optimization of the operating parameters of U-shpaed DC arc plasma and spectrometer parameters has been undertaken to explore the possibilities of improving its detection power. It is demonstrated, with a U-shaped arc as an example, that the limits of detection, in addition to well-defined parameters as described by Boumans 1,2 and Winge, 3 depend on the signal integration time. It is shown that with increasing integration time, the limits of detection are decreased within some limits and thatdoi:10.2298/jsc0104249t fatcat:bv6q23uhhjfp7l5r6ytl6zsy4u