Microwave digestion is an industrial technique in use by scientists worldwide to dissolve heavy metals in the presence of organic molecules, prior to the analysis by inductively coupled plasma, atomic absorption, or atomic emission measurement. This technique is accomplished by exposing a sample to a strong acid in a closed vessel, and raising the pressure and temperature though microwave irradiation. This increase in temperature and pressure of the low pH sample medium thereby increases both the speed of thermal decomposition of the sample, and the solubility of heavy metals in solution. Once these heavy metals are in solution, it is possible to quantitate or quantify the sample through elemental techniques.
References: H. M. Kingston and Lois B. Jamie. “Introduction to microwave sample preparation: Theory and practice” ACS Professional Reference Book, ACS, Washington, D.C., 1988. Pages xxii + 263.
The CEM MARSXpress Option
Optimum Control for the Microwave Digestion of High-Throughput or Routine Samples
With the advanced technology of the MARS System with the MARSXpress option from CEM, high-pressure digestions are easier than before and accurate in its results.
* MARSXpress displays and permanently records temperature readings for all vessels!
* Process up to 40 samples simultaneously
* No connections, no tools needed!
* Accurate internal temperature control
* Optional connection-free pressure regulation
* Confirmation of temperature for every vessel
The advanced design of the MARSXpress vessel in combination with CEM’s sophisticated and highly sensitive IR temperature sensors mean the internal temperature of each vessel is measured virtually instantaneously without any of the lag associated with competitive IR-based systems. The heart of the system is the dual NIST traceable calibrated temperature measurement system. The sensors accurately and instantaneously measure the temperature of each individual vessel, providing users with unmatched control of digestion parameters, as well as safety.
Maximum Control Option
Maximum Control for the Microwave Digestion of High-Temperature or High-Pressure Samples
* Optional all-vessel temperature control
* Highest temperatures (up to 300 °C) or pressures (up to 1500 psi)
* Easy “pop-in” sensor connections
* In situ temperature control
* Direct pressure feedback & control
The MARS Microwave Digestion System can be configured with XP-1500 Plus™ vessels, the ESP-1500 Plus™ and RTP-300 Plus™ reference vessel controls and DuoTemp for the highest temperature and pressure conditions available with maximum safety and control.
Fluoropolymer liners of TFM®, combined with CEM’s proprietary composite sleeve material and open frame architecture makes this high technology molded vessel the safest option for extreme matrices. Quite simply, these vessels are the lightest, strongest and fastest cooling vessels available. The strength-to-weight ratio of CEM’s advanced vessel designs negates the need for exterior cooling devices. Accessory cooling blowers, water baths, or ice baths are redundant now that the CEM cooling options are way ahead of the league.
All MARS Microwave Digestion Systems contain built-in software safeguards that disallow programming to unsafe combinations of pressure and temperature. CEM offers a range of liner choices for its vessels including TFM, PFA, quartz, and glass.
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