Abstract
Iron, copper and cadmium are determined in brine shrimp specimens using graphite furnace atomic absorption spectrometry. Four different digestion procedures, (i.e., dry ashing, hot-block, high pressure and microwave heating digestion) are compared. It was concluded that microwave heating digestion in polyethylene autosampler cups is excellent for the rapid dissolution of sub-milligram amounts of biological material. Applying platform atomisation and peak-area integration, a calibration against acid standards can be used for the determination of the three metals. The use of the ammonium phosphate-magnesium nitrate sample modification for the determination of cadmium allows a maximum pre-treatment temperature of 1000 °C. Continuum source background correction does not cause correction errors and background-corrected analyte absorbance signals appear undistorted. There is good agreement between the results obtained from furnaces and flames, confirming that the chemical and spectral interferences have been overcome.
Published Version
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