DMA-80: the Hardware

Built-in 40 position autosampler for unattended, high throughput of samples with quartz or metal boats
Dual measuring cells for extended analysis range, up to 1000 ng
Built-in Atomic Absorption Spectrophotometer uses 254 nm wavelength for Hg analysis
Terminal 1024 allows easy manipulation of the control software via keyboard and mouse or touch screen monitor
Analytical balance for automatic sample weight data transfer
Easy data transfert by EasyDOC Windows-based software

Principle of operation

Solid or liquid samples are weighed and introduced into the sample boat. The sample is initially dried and then thermally decomposed in a continuous flow of oxygen. Combustion products are carried off and further decomposed in a hot catalyst bed. Mercury vapors are trapped on a gold amalgamator and subsequently desorbed for quantitation. The mercury content is determined using atomic absorption spectrophotometry at 254 nm.
The graphic shows a typical peak profile resulting from analysis.
The 1st peak corresponds to the long pathlength flow cell and Hg content up to 20 ng. The instrument determines the absolute amount of Hg (normally expressed in ng), and then the software calculates its concentration in the sample.
The 2nd peak corresponds to the short pathlength flow cell and Hg content in the range of 20-1000 ng.
The software measures the height, the half width and the area of the absorbance peak, which assists in both method development and troubleshooting.

The intuitive, user friendly software

Fully complies with CFR 21, part 11!

Secure electronic data keeping made easy with Milestone’s software!
Fully complies with CFR 21 part 11, which is also being considered by EPA for electronic data management and reporting.

Easily identifiable data files
Automatic storage of data
Complete documentation
Editable process parameters for individual samples

Editor setup The DMA-80 software allows youto create and store commonly used methods; create easily identifiable data files; and select mode operation (single or autosampler).		Main control panel The software completely controls the systems operation and provides valuable feedback on the instrument’s performance. You can monitor the progress of the analysis and manipulate the autosampler.

Calibration curves Two calibration curves are used; each cell has its own calibration c u rve to cover a wide range of Hg concentration (typically from 0.2 µg/kg to 10 mg/kg for sample weight of 100 mg).		Display of samples data Document the sample ID and weight; the controller will report the Hg absorbance, absolute hg in the sample in ng units and total Hg concentration. Once the sample analysis is finished, the data is automatically stored in a database. Edit the working parameters for any sample at any moment in time.