Introduced commercially in 2007, MERX-M was the world’s first commercial automated analytical system based on US EPA Method 1630 for methylmercury analysis. Around the world, numerous national environmental agencies and leading universities have quickly embraced MERX-M as an easy-to-use, robust, and reliable system that delivers high quality data. MERX-II-M is the new Dual Trap automated methylmercury analysis system replacing the older MERX-M system.
Like the original, the new MERX-II-M:
Liquid Handling
The system can be operated in two different sample purge modes: purge vessel mode, in which a sample is transferred to the glass purge vessel for purging, and purge-in-vial mode, in which the sample is purged directly in its vial. With either option, N2 gas volatilizes ethylated Hg species to a Tenax® trap. The system can accommodate 40 ml and 60 ml vials.
Trap Processing
With two traps, the MERX-II-M is fast. While one sample is purging to one trap, the other trap is being desorbed to the GC.
GC Separation
The released Hg species are separated on a GC column and then thermally reduced to elemental mercury.
CVAFS Detection
Mercury is detected using the Brooks Rand Model IV cold vapor atomic fluorescence spectrophotometer (CVAFS) with patented optics for enhanced sensitivity. The new Model IV detector has a smaller footprint, is designed for easy maintenance and service, and is even more sensitive and stable due to improved optics.
Data Processing
Mercury Guru software integrates the detector signal and calculates results based on calibration and sample volume information. QC results are automatically calculated and flagged based on user-defined criteria. New software features include controls to auto-zero the detector, set detector sensitivity, set GC temperature and set gas flow rates.
ICP-MS interfacing
The system is designed to easily interface with the laboratory’s ICP-MS. Users have the flexibility to run the system with CVAFS only, ICP-MS only or with CVAFS and ICP-MS in series.
Liquid Overflow Protection
Now fully integrated, the liquid overflow sensor, when triggered, will shut down the system to prevent sample loss and damage to the system.
Other Improvements
Improved fittings with minimized dead-space, more robust valves, all USB data connections, and smaller footprint.
