The Mars Surveyor 2001 Lander is scheduled to carry the Mars Environmental
Compatibility Assessment (MECA) that is being developed by the Jet Propulsi
on Laboratory of the California Institute of Technology. This article descr
ibes the Wet Chemistry Laboratory (WCL), which is a key component of the ME
CA. Through use of an array of electrochemical sensors, the WCL is designed
to determine the extent of the hazard that the Martian soil will present t
o human explorers and equipment.