SCHEDULED MAINTENANCE
Determination of mercury(II) and organomercury compounds by reversed-phase liquid chromatography with reductive electrochemical detection
Abstract
Electrochemical detection in the reductive mode at a gold amalgamated mercury electrode combined with reversed-phase liquid chromatography was used to determine inorganic mercury (HgII) and three organomercurials in spiked water samples. The neutral charge mercury complexes were eluted cleanly and efficiently with 60%m/m methanol, buffered to pH 5.5. The maximum retention time was less than 10 min at a flow-rate of 0.6 ml min–1. Detection limits for the analytes varied from approximately 1 to 2 µg l–1. Calibration graphs for each of the mercury species were linear over several orders of magnitude ranging from below 20 pg µl–1 to greater than 10 ng µl–1.
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