This is an illustration of the analytical procedure of NASA's Phoenix Mars
Lander's Wet Chemistry Lab (WCL) on board the Microscopy,
Electrochemistry, and Conductivity Analyzer (MECA) instrument. By
dissolving small amounts of soil in water, WCL can determine the pH, the
abundance of minerals such as magnesium and sodium cations or chloride,
bromide and sulfate anions, as well as the conductivity and redox
potential.
The Phoenix Mission is led by the University of Arizona, Tucson, on behalf
of NASA. Project management of the mission is by NASA's Jet Propulsion
Laboratory, Pasadena, Calif. Spacecraft development is by Lockheed Martin
Space Systems, Denver.