Abstract:

An effective method was developed for sequential rapid determination of five metallic elements in Pleurotus
geesteranus by microwave digestion-high resolution continuum source graphite furnace atomic absorption spectrophotometry
(HR-CS-GF-AAS). Some potential interferences were eliminated effectively by using appropriate analytical spectral lines
and matrix modifiers. Under the selected working conditions, the contents of Cu, Cd, Pb, Mn, Al in Pleurotus geesteranus
were 11.1, 0.284, 0.019, 12.1 μg/g and 51.3 μg/g, respectively and the average spike recoveries were 105.1%, 94.4%, 93.4%, 95.8%, and
98.7%, respectively. The detection limits for the metallic elements were 1.22, 0.077, 1.53, 0.614 ng/mL and 1.54 ng/mL, respectively.
The precision relative standard deviations ranged from 2.2% to 5.8%. Therefore, this method was rapid, accurate, stable and
less pollutive, thus having a high practical value.

Key words: microwave digestion, high resolution continuum source graphite furnace atomic absorption spectrophotometry (HR-CS-GF-AAS), Pleurotus geesteranus, metallic element