Abstract
Background emission intensity (BG) of an ICP was measured as functions of several parameters for the graphite cup direct insertion technique and the pneumatic nebulization method. The BG decreased with increasing observation height for both methods. The degree of the BG change in the visible region was larger than that in the u.v. region. The BG increased with an increase in the rf power and the increasing rate for the graphite cup technique was smaller than that for the nebulization method. With increasing the outer gas flow rate, the BG increased in the visible region but decreased in the u.v. region for the both methods.The different behavior with respect to wavelength can be attributed to different origin of the ICP continuum between the two wavelength regions. Under the usual operating conditions, the BG was lower for the graphite cup technique than for the nebulization method especially in the visible region, indicating higher sensitivity for the former method.
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