Due to the high toxicity of mercury and its compounds for the human organism it is necessary to monitor continuously mercury containing water and air.

The automatic and continuous estimation of mercury in water with the Hg-Monitor (or combination of mercury compounds) is done easily as well as reliably. Reductive preparation of mercury compounds being dissolved in water with tin II dichloride (SnCl2) leads to elemental mercury (Hg(II) ---» Hg(O)).

Some types of mercury compounds such as dialkyl mercury compounds (CH3 - Hg - CH3; enzymatic generation by microorganisms) are first treated in a special quartz glass reactor with UV light converting the diaklyl mercury compound into ionic "free" bivalent mercury.

The UV light source is controlled inbrightness, i.e. its effectiveness is ensured. Any lamp disfunction or even excessive dirty medium will be indicated.

It is very easy to desorb elemental dissolved mercury out of water. The aqueous solution is now being introduced into a special desorption column. The elemental mercury is carried over into the gasphase in countercurrent with air and is detected by a microprocessor controlled UV photometer at 253.7 nm.

The concentration of mercury in water is automatically calculated and displayed by the microprocessor. It is not necessary to calibrate this system, except you are having great temperature fluctuations. The zero point is adjusted automatically in selectable intervals (Hg adsorber).

Possible measuring ranges:

• 0.00 ~ 10.00 ug/l
• 0.00 ~ 30.00 ug/l

Continuous Measurement of mercury in air

The automatic and continuous estimation of mercury in air with the Hg-Monitor (or combination of mercury compounds) is done easily as well as reliably.

For measuring mercury in air there are generally two suitable processes: while in the first process mercury will be introduced in an aqueous solution and then - as described above - prepared and measured, the second process enables to have a direct measurement of the air containing mercury.

Condition for this is that in the air to be measured - if necessary after the respective pretreatment - there are no substances left which can absorb UV light on a wavelength of 253.7 nm.

As the UV photometer can detect elemental mercury only it might be necessary - according th the field of application - to reduce mercury in other oxidation numbers into elemental mercury, e.g. while using a special reduction oven. To avoid soiling of the photometer and thus to ensure a reliable operation of the Hg monitor, use of a Teflon membrane filter and a water separator is recommended.

Mercury is detected by a microprocessor controlled UV photometer at 253.7 nm., thus concentration of mercury is automatically calculated and displayed.

It is not necessary to calibrate this system, except you are having great temperature fluctuations. Zero point is adjusted automatically in selectable intervals.

Possible measuring range: 0.00 ~ 100.00 ug/m3 or higher