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Abstract
The construction of a graphite capsule in flame atomiser is described for the direct atomic absorption spectrometric determination of lead in soils, sediments and bone ash. A single calibration graph can be used for different materials, prepared by atomisation of different masses of various standard reference materials. The absolute limit of detection of lead at the 283.3-nm line was 2 × 10–3µg and the reproducibility was 8–20%(RSD). The effects of the physical properties of the graphite and the effect of the heating power upon the lead absorbance-time profiles were investigated. These parameters were found to have a direct influence on the sensitivity, accuracy and precision of the measurements.
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