Results and Discussion
Graphite Furnace Method Development
The aim is to use a single matrix modifier for both elements to
simplify the analytical process. The main purpose of a matrix
modifier is to volatilize the matrix during the pyrolysis while
increasing the stability of the element. This ensures almost
interference-free analysis whereby the elment is separated from
the potential interference. As a result, aqueous calibration
standards can be used; the method of standard additions is not
required. The best results obtained in terms of peak profile and
recoveries were with a 5 µL mixture of 0.06% magnesium
nitrate and 0.1% palladium for Pb mixture, while a 5 µL mixture
of 0.1% ammonia phosphate and 0.06% magnesium nitrate
gives better peak profile and recovery for Cd. In both cases, the
non-specific background was somewhat higher than without
modifier. The peak profiles for Pb and Cd standards are shown in
Figures 4 and 5.