Cold Vapour Atomic Fluorescence

In an effort to achieve sub-parts per trillion (ng/L) levels of detection for mercury Cold Vapour Atomic Fluorescence (CVAF) is the technique of choice.  In comparison with Atomic Absorption; Atomic Fluorescence detection provides superior detection limits and dynamic range.
Mercury within an aqueous or digested sample solution is first oxidised to Hg2+ before analysis.  During the analysis samples are mixed with a reductant (typically stannous chloride) to produce elemental mercury vapour (Hg0).  This solution enters a gas / liquid separator from which the mercury vapour is transported via a carrier gas (argon) to a fluorescence cell for quantitative measurement by AF spectroscopy.

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