Abstract
Discrete injection (DI) of μl- volume liquid samples into a continuous flow of air as carrier is demonstrated. Atomic-absorption (AA) detection is used. Calibration graphs for zinc, obtained by using the DI-AA-air carrier method have a slope 1.8 times that of graphs obtained by the flow-injection analysis (FIA)-AA-air carrier method. The DI-AA-air carrier signals are higher and sharper than the FIA-AA-water carrier signals, and even exceed the AA steady-state signals for the same zinc solutions, owing to improved nebulization/atomization. The air-carrier method is more rapid than the liquid-carrier method. Measurement rates of 600/hr are possible. The signals show precision comparable to that attainable with water as carrier. The method is particularly useful for flame or plasma detectors and is potentially useful with different gases or vapours as carriers, and for gas-liquid reactions in FIA.
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