Determination of sub-nanogram-per-liter levels of mercury in lake water with atmospheric pressure helium microwave induced plasma emission spectrometry

A highly sensitive method for the analysis of Hg was developed utilizing atmospheric pressure He microwave induced plasma (He-MIP) emission spectrometry. Mercury vapor was generated from water samples by reduction and purging and was collected with a gold amalgamation trap. The Hg vapor, removed by heating the trap, was introduced into the He-MIP. The atomic emission line of 253.7 nm was used for the determination of Hg. The detection limit, defined as 3 times the standard deviation of the blank operations, was 0.5 pg in 50 mL of water sample, corresponding to 0.01 ng/L. The method was applied to the determination of ultratrace levels of Hg in lake water samples. The inorganic Hg concentration in subsurface water from unpolluted Lake Mashu was found to be 0.3 ng/L. 29 references, 3 figures, 1 table.

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