Abstract

The applicability of a microwave induced plasma (MIP) as an on-line element-specific detector in high-performance liquid chromatography (HPLC) was investigated. A mixed gas oxygen-argon MIP sustained in a modified discharge tube consisting of two concentric quartz tubes, was used as an atomic emission detector for different mercury compounds. After passing the UV-vis detection cell of the HPLC system the eluent is nebulized and reaches the plasma without prior desolvation. The plasma tolerates methanol-water mixtures up to a methanol content of 90%. Detection limits for organically bound Hg are in the nanogram range. The sensitivity depends, however, on molecular structures. The capability of the HPLC-MIP is illustrated by the separation of some mercury species as 2-mercapto-ethanol complexes and by investigations of immobile mercury compounds in highland peat bog soil.

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