MILESTONE DMA-80 direct mercury determination device

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DMA-80 direct mercury determination device with sample changer

The DMA-80 direct mercury determination device manufactured by MILESTONE is suitable for the direct determination of total mercury from both solid and liquid samples. No wet chemical sample preparation process is required! Measuring a sample takes 5-6 minutes (liquid 6 minutes due to evaporation). By filling the device's 40-place sample changer with a solid sample, it can perform the analysis of all samples fully automatically in approximately 4 hours. Thanks to the computer control, it is possible to fully document the analysis.

More details

Operation of the device:

The solid or liquid sample must be weighed directly into the boat. The sample is first pre-dried in a continuous stream of oxygen and then burned in the same place. The resulting combustion products undergo further decomposition in the catalyst furnace and then leave the system. The mercury vapors released during the burning of the sample are bound on the cold gold amalgamator, and after the amalgamator is heated - evaporated from there - they enter the built-in atomic absorption photometer.

Thanks to this technology, the analysis is matrix-free!
Mercury is quantified at 253.65 nm.

The graph shows a typical measurement where two peaks are visible: the first (higher) signal comes from the long cell, in which total mercury between 0.02 and 20 ng can be determined.
The second signal comes from the short cell, which can measure between 20 and 1,000 ng of total mercury. The device measures total mercury, which the software converts into concentration. The software also measures the height of both peaks and the width of the peaks at half height, which helps with method development and error limitation.

The TRICELL device has three measuring cells and two detectors. The lowest range measuring cell measures between 0.0015 ng and 10 ng..

Some features of user-friendly software

Program editor

With the DMA control software, you can create new methods, easily identifiable databases, and select the main operating modes (individual or pattern changer).

The main control window
Here you can see the status of the system elements. The sample changer is also managed from here.

Calibration curves
Both measuring cells (TRICELL has three) have separate calibration curves for a wide measuring range.

Displaying the data

Documenting the sample ID and mass: the absorbance for all measured samples, total mercury in ng, and the concentration in ppb are displayed on the monitor. Additional patterns can be added to the row at any time. When the analysis is finished, the results are automatically stored. The parameters assigned to each sample can be changed at any time during the operation of the device.

Simple and fast measurement with the DMA-8

Specifications:
Sample handling:	programmable drying, firing temperatures and times
Fluid sample:	max. 1.5 ml
Solid pattern:	max. 500 mg
Controller:	T640: 6.4" or T1640: with 12" color touch screen, chip card
Detection of mercury:	single-beam photometer with two (3 for TRICELL) flow-through measuring cells
Light source:	low pressure mercury vapor lamp
Wavelength:	353.65 nm
Interference filter:	354 square meters with a bandwidth of 9 square meters
Detector:	silicon UV photodetector
Detection limit:	0.02 ng Hg, TRICELL: 0.0015 ng Hg
Measuring ranges:	0.02 ng – 20 Hg, 20 ng – 1,000 ng: AT TRICELL still + 0.0015 ng – 10 ng Hg
Repeatability:	better than 1.5%
Calibration:	with standard solutions and reference materials per cell
Carrier gas:	99.95% pure oxygen
Sample changer:	built-in, 40 slots for solid and liquid samples
Software:	Windows-like target software, suitable for documentation according to TQM, GLP and ISO standards
Power:	230-240 V, 50/60 Hz, 1.4 kW
Dimensions:	80 x 82 x 30 cm (without controller)
Weight:	56 kg