Abstract
A method of selenium hydride atomization using a cool highly fuel rich-hydrogen—oxygen diffusion flame burning in the inlet part of a T-shaped quartz tube placed in the optical axis of an atomic absorption spectrometer is investigated. It is shown that hydride atomization is caused by free radicals (H, OH) generated in the flame. Atomization (proceeding probably with 100% efficiency) is completed before the gases reach the optical axis. The life-time of free radicals is considerably reduced by admixture of even small amounts of oxygen to the hydrogen flush gas. A mathematical function describing the dependence of the selenium peak areas on the gas flow is derived and values for the selenium atomic absorption coefficient and rate constant for selenium decay by reactions on the tube walls are obtained by fitting experimental data to this function. The atomic absorption coefficient agrees well with a theoretically estimated value. The described method seems promising for absolute analysis by AAS.
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