Abstract
The use of a microwave oven for the rapid digestion of dust samples has been evaluated. Deposited dust collected for the study and reference samples representing municipal waste incineration ash, urban particulate matter and river sediments were the samples used in the study. The technique was compared with traditional methods after establishing optimal efficiency of digestion according to power setting, time and the use of different acids. Lead and cadmium content of the samples were determined by differential pulse anodic stripping voltammetry (DPASV) and atomic absorption spectrophotometry (AAS). A digestion procedure of 20–30 min for dust samples (0.1–1.0 g) allows recovery of Pb and Cd at over 80% with nitric acid or aqua regia and over 90% with a nitric/hydrofluoric acid mixture.
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