Environmental Laboratory

  • Mercury in ambient air, workroom air and stack gas applications

Mercury in ambient air, workroom air and stack gas applications

Jan 20 2020 Read 495 Times

Currently the monitoring of mercury in ambient air is not extensive due to the limited number of monitoring sites around the globe. In one approach P S Analytical (PSA) has used gold on silica Amasil adsorption tubes designed for pumped mercury vapour sampling as passive samplers, offering a simple, maintenance free and cost-effective sampling solution. These tubes are returned to a centralised lab for thermal desorption and analysis by Atomic Fluorescence Spectroscopy (AFS). These sampling tubes may be reused and redeployed.

Workroom air monitoring requires a different sampling approach. There is often the potential of high concentrations of mercury vapour in localised areas, e.g. during Hg recovery/recycling or in manufacturing processes. Real time results are required to protect workers from potential Hg vapour exposure. PSA’s approach here is for the workroom air to be pumped to a central AFS instrument. Multi-stream (room/area) monitoring is therefore easily achieved, offering early warning alarms should set limits be breached.

Stack gas monitoring is usually carried out for emission compliance and typical industries affected include; coal fired power, cement manufacture, smelting operations and the like. Here a coated sample probe takes a volume of stack gas, dilutes and removes interference before carrying it to the AFS for determination.

In common with all of their technology, PSA employs AFS as their central analytical technology which offers dominance and leading performance in terms of; sensitivity, working ranges, freedom from interferences.

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