Abstract
The dissolved oxygen in an acidic mobile phase can be reduced and eliminated by a scrubber column packed with zinc amalgam particles. The zinc amalgam scrubber column is mounted between the pump and the injection device and enables sensitive amperometric detection at potentials down to −0.65 V vs. Ag/AgCl. The high overvoltage of hydrogen on mercury allows the use of acidic mobile phases without problems with evolution of hydrogen gas. The accessible potential range is limited by the reduction of Zn 2+ dissolved from the scrubber column. The possibilities for trace amount determinations of nitrocompounds are demonstrated in the detection of trinitrophenyl derivatives of amino acids from reaction with trinitrobenzenesulphonic acid. The detection was focused on γ-aminobutyric acid, and a detection limit of 0.1 pmol at −0.6 V vs. Ag/AgCl was obtained.
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