Abstract
Tubes are machined from rods of suitable graphite according to a modified design so that there is a recess of 20-μl capacity in the inner surface at the tube centre; this improves reproducibility and sensitivity. Pyrolytic carbon coating is accomplished independently of the atomic absorption instrument by using a simple apparatus (dimensions are given). Tube lifetimes are considerably longer than those of both coated and uncoated commercial tubes. The coated tubes described have lifetimes long anough at high atomizing temperatures to determine uranium and boron on a routine basis. The boron memory is eliminated and that of uranium successfully controlled. The addition of organic solvents to the analyte solution to enhance sensitivity for uranium is reported.
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