Milestone Srl - Products - Mercury Determination - DMA-80L

How it works

Liquid samples are initially weighed and introduced into the sample boat.
The mercury contained in the sample is reduced to its elementary state by tin-II-chloride.
A stream of carrier gas is stripping the mercury from the aqueous phase. Mercury vapors are trapped on a gold amalgamator and subsequently desorbed for quantization.
The mercury content is determined using atomic absorption spectrophotometry at 254 nm.

The Milestone’s DMA-80L combines an innovative tri-cell measuring system of mercury with a new dual optical path spectrophotometer. It is equipped with a further cell (Cell 0) and with 2 Silicon UV Photodetectors.

Main Advantage

Better Sensitivity

It allows to:

Determine mercury at lower concentrations
Perform a wider range of applications

Wide Measuring Range

By fast amalgam heating, Mercury is quickly released and transported by the carrier gas into the three absorption measuring cells.
The first cell detects Mercury with the highest sensitivity and it is therefore suitable for low concentration.
The second cell is for medium concentrations and the third one for elevated mercury concentrations.
On the basis of the Mercury content of the solution, the software automatically choose the appropriate measuring cell.

DMA-80L calibration

The calibration of the DMA-80L is carried out by measuring certified standards. The instrument automatically select the optimal calibration curve, corresponding to the measuring cell of the atomic absorption spectrometer. A separate calibration curve, up to 10 ng of Mercury, is used for extremely low concentrations.

The conversion from Mercury absolute quantity to concentration is automatically done by the software.

Unique features

H₂O-Sensor

The H₂O-Sensor detects the presence of liquids, i.e. droplets in the gas piping (channel).
When the sensor is off, the unit stops to protect and avoid the presence of liquids in the valve block, amalgamator and cuvette. Sensitivity can be set according to special requirements.