Microwave acid dissolution of soil samples for elemental analysis

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Abstract
Closed vessel microwave acid dissolution is compared with conventional open vessel methods for the determination of trace zinc and copper in a series of soil samples collected from sugarcane fields in Swaziland. Analytical measurements by flame atomic absorption spectroscopy show that alt the zinc and copper in the samples is released within 7 min in a commercial microwave oven at 400 W. Up to seven 500-mg portions can be handled at a time. Attention must be paid to the amount of organic matter present in a soil so that excess pressure build up does not occur during dissolution. Keywords: microwave dissolution, soil analysis, trace metal determination, atomic absorption spectroscopy.

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