The DMA-80 is based on the principles of sample thermal decomposition, mercury amalgamation and atomic absorption detection.
It is extremely easy to use: Just weigh your sample, load it onto the built-in auto-sampler and press ‘start’.
All the DMA-80 components, such as the catalytic furnace, amalgamator and spectrophotometer, are easily accessible for routine cleaning and maintenance.
The DMA-80 has been used to develop the US EPA method 7473 (Mercury in solids and solutions by thermal decomposition, amalgamation, and atomic absorption spectrophotometry).
It is furthermore compliant with ASTM method D-6722-01 (Total mercury in coal and coal combustion residues) and ASTM method D-7623-10 (Total mercury in crude oil).
The terminal runs Milestone’s unique EasyCONTROL software, providing simple and intuitive, but extremely flexible and powerful control over the analytical process. All sample parameters, including furnace temperatures, method profiles, absorbance signals, results, and calibrations are saved. They can be viewed, easily transferred using a USB memory stick or integrated to LIMS. EasyCONTROL software includes the unique AutoBLANK feature. If, following the analysis of a sample with very high mercury contents, the pre-set blank level is exceeded; EasyCONTROL will automatically run blank cycles until the pre-set blank level is achieved.
EasyCONTROL allows the operator to designate certain samples as reference, or QC samples. Once a sample is designated as a reference, a known concentration value is entered. If the analysis of that sample yields a concentration outside the acceptable range specified by the operator, EasyCONTROL can be pre-set to either continue, stop, or pause the analysis of the remaining samples.
follow Q 1: Can the DMA80 analyze the organic mercury without digestion?
A: DMA-80 doesn’t need any sample digestion or wet chemistry before the analysis.
• Once the sample boats are placed on the auto-sampler tray, a pneumatic arm carries the boat inside the decomposition furnace where the sample is burned and mercury released in vapor form.
• Oxygen or air, the typical carrier gases, transport the mercury vapors to the catalyst tube, where the impurities are filtered and the various states of mercury are reduced to elemental mercury
• The elemental mercury vapors are trapped on a gold amalgamator.
• The gold amalgamator flash heats to ~850°C and releases the mercury in the atomic absorption spectrophotometer.
The DMA-80 total time per analysis is 6 minutes.
http://talkinginthedark.com/all-he-drinks-are-suicides/2015/01/ Q 2: Which kind of carrier gas is used with this system?
A: It is possible to use Oxygen or Pure Air.
A Milestone Air Compressor is available in order to filter the Air and purify (Hg/Moisture free) with unlimited flow and with a great benefit concerning running cost.
enter site Q 3: Does DMA-80 need different calibrations for solid, liquid and gas samples?
A: The DMA-80 is not Matrix dependent. It means that using one calibration it is possible to analyze liquid, solid and also gas samples without software or hardware adjustments.
http://melroth.com/?komp=forex-new-tips&eb1=1c Q 4: Is the DMA in compliance with some official methods?
A: Yes, the DMA-80 is compliance with Environmental Protection Agency (EPA7473 – EPA30B) and ASTM 6722-01 and all methods that require mercury analysis by thermal decomposition and amalgamation technique.
en ucuz forex ayakkabı Q 5: Are there any potential cross contaminations using DMA-80?
A: The Cross Contamination is eliminated thanks to an EasyCONTROL software feature called “Automatic Blank value cycles”. This function recognizes the high Hg concentration and, if necessary, automatically starts blank cycles in order to clean the system and avoid memory effect on the next analysis.
go here Q 6: Which kind of sample boats DMA-80 use? How many times can I re-use them?
A: We have two different kind of sample boats:
- Nickel: for solid samples , reusable thousand times. Nickel boats can be cleaned using a Muffle at 600°C per 20minutes. Only hot temperature in order to clean out the Hg!
- Quartz: for liquid and semi-liquid samples, reusable thousand times. Quartz boats can be cleaned using a Muffle at 600°C per 20 minutes. It is also possible to clean them using a 10% HNO3 solution overnight!
Q 7: What about the typical analysis time?
A: The typical analysis time is 6 minutes including the handling time (three simple steps: sampling, weighing and loading). The DMA-80 is fast and easy to use.
http://www.cilentoescursioni.it/?kiskwa=andamento-euro-dollaro-binarie&c6c=03 Q 8: Does DMA-80 generate acid waste?
A: The DMA-80 does not generate any kind of acid waste since it doesn’t need any reagents for the Hg analysis.
watch Q 9: What are the differences comparing DMA-80 Tri-cell and DMA-80 Dual-cell?
A: There are two DMA-80 different configurations
DUAL CELL DETECTION RANGE (TWO SPECTROPHOTOMETER CELLS)
• 0.03 to 1,500 ng Hg
• Detection limit- 0.003 ng Hg
• Applications: Fish / Soil, Sediment and Sludge / Hazardous Materials / Chemicals / Polymers / Paints / Coating
TRI-CELL DETECTION RANGE (TRHEE SPECTROPHOTOMETER CELLS)
• 0.01 to 1,500 ng Hg
• Detection limit - 0.001 ng Hg
• Applications: Clinical Samples / Pharmaceuticals / Nutraceuticals / Food and Beverages / Petrochemical / Natural Gas
frau treffen schweiz Q 10: Do I need to dry the sample first? Moisture affects my samples?
A: You don’t need to dry the sample first because the thermal decomposition method of DMA-80 already includes a drying step. Furthermore the pre-heated cuvette, eliminates avoid drop condensation in the optical cell of the spectrophotometer.
speed dating barcelona 2015 Q 11: What is the lifetime of the catalyst and amalgamator?
A: The catalyst and amalgamator lifetime is thousand cycles considering the analysis of samples. The system keeps track of usage for catalyst and gold amalgamator and report when schedule. Maintenance is required.
dating ex's best friend yahoo Q 12: How much carrier is gas needed for the analysis?
A: The DMA-80 works using few l/h of oxygen or pure air as carrier gas. Considering 8 hours per day and 5 days per week, the typical gas tank (40 Liters 200 Bar) lifetime is approximately 3 months.
Q 13: Where the mercury vapors collected after the analysis?
A: After the analysis, the mercury vapors are collected in a Mercury Trap. Thanks to this trap is not required to work under fume hood.
Q 14: Is the DMA-80 controlled by a PC or a Terminal?
A: The DMA-80 works with Terminal, colors touch screen and Easy control Software. Anyway there is the possibility to control the DMA-80 using the PC.