The present invention provides a system wherein the Griess reagent has the ambient atmosphere removed. The present invention provides a system to treat the Griess reagent to improve storage lifetimes at room temperature or higher to over a year or more. The present invention greatly extends the useful lifetime of preparations of the Griess reagent as well as broadens the applications to field testing equipment.
 The United States Government has rights in this invention pursuant to Contract No. W-7405-ENG-48 between the United States Department of Energy and the University of California for the operation of Lawrence Livermore National Laboratory.