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Applications of a slotted quartz tube and flame atomic-absorption spectrometry to the analysis of biological samples.

A slotted quartz tube used with an air-acetylene flame increases the residence time of atoms in the light path of an atomic-absorption spectrometer, thus increasing the analytical sensitivity. With this technique lead and cadmium were determined in whole blood following precipitation of cells and protein with trichloroacetic acid, copper and zinc were determined in serum diluted 1 + 20 and the measurement of metals in urine was investigated. Rapid, accurate analyses can be achieved using continuous aspiration or, when there is limited volume of sample, by discrete nebulisation. Long-term performance was assessed during a period of 3 months.