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In page Atomic absorption spectroscopy:

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Cold-vapor atomization is a method limited to the determination of mercury due to it being the only metallic element with a high vapor pressure at ambient temperature.[1] Because of this, it is important for determining organic mercury compounds in samples and their distribution in the environment. The method begins by converting mercury into Hg2+ by oxidation from nitric and sulfuric acids, followed by a reduction of Hg2+ with tin(II) chloride. The mercury is then swept into a long-pass absorption tube by bubbling a stream of inert gas through the reaction mixture. The concentration is determined by measuring the absorbance of this gas at 253.7 nm. Detection limits for this technique are in the parts-per-billion range, making it an excellent mercury detection method.[citation needed]