Roll-over effect in graphite furnace atomic absorption spectrometry with a gold pulsed hollow-cathode lamp

Abstract

The presence of stray light in graphite furnace atomic absorption spectrometry causes errors in background correction at high analyte concentrations. The stray light level originates in the hollow-cathode lamp, but can be modified in the atomizer. Some differences were noted for both wall and platform atomization. Other factors, such as the presence of matrix components (copper) or chemical modifiers (vanadium), also affect the sensitivity for gold and consequently have an effect on the roll-over phenomenon. Experimental results show that the stray radiation depends on the wavelength region used for the determination of gold.