NOVELTY - The process comprises positioning an integrated electrochemical reactor inside a controlled atmosphere glove box (77), where the reactor has an internal volume including a mixing chamber (21) and an electrolysis chamber separate from the mixing chamber, placing a known quantity of a first substance into the integrated electrochemical reactor through an opening in the reactor, where the first substance is placed into the mixing chamber and/or the electrolysis chamber, and placing a known quantity of a second substance into another of the mixing chamber or the electrolysis chamber.    USE - The process is useful for performing an electrochemical conversion for production of gases such as hydrogen gas, carbon dioxide and oxygen.    ADVANTAGE - The process is capable of efficiently performing the electrochemical conversion thus easily producing transportable gases with high durability and small amount of electrolyte solution and preventing the decontamination of the reaction products through leaking or other source of contaminants.    DETAILED DESCRIPTION - The process comprises positioning an integrated electrochemical reactor inside a controlled atmosphere glove box (77), where the reactor has an internal volume including a mixing chamber (21) and an electrolysis chamber separate from the mixing chamber, placing a known quantity of a first substance into the integrated electrochemical reactor through an opening in the reactor, where the first substance is placed into the mixing chamber and/or the electrolysis chamber, placing a known quantity of a second substance into another of the mixing chamber or the electrolysis chamber free of the first substance, sealing the opening of the integrated electrochemical reactor to isolate the internal volume of the reactor, rotating the integrated electrochemical reactor such that the substance in the electrolysis chamber is transferred to the mixing chamber for mixing with the other substance to form a mixture, rotating the integrated electrochemical reactor such that the mixture in the mixing chamber is transferred to the electrolysis chamber, electrolyzing the mixture in the electrolysis chamber to change a portion of the mixture from a first chemical state to a second chemical state by passing electrical current through an anode and a cathode positioned in the electrolysis chamber in spaced relation relative to one another, manually moving the sealed electrochemical reactor from a location remote from the analyzer to the analyzer, connecting the integrated electrochemical reactor to an external analyzer to measure the first substance, the second substance, the first chemical state and/or the second chemical state, connecting the integrated electrochemical reactor to a vacuum producing system to apply a regulated vacuum to the integrated electrochemical reactor, attaching the integrated electrochemical reactor to a gas control manifold, and evacuating gas from the internal volume of the integrated electrochemical reactor. The step of placing the known quantity of the first substance into the reactor comprises placing an isotopically enriched substance into the integrated electrochemical reactor. The step of placing the known quantity of the second substance into the reactor comprises placing a reactant into the electrochemical reactor for mixing with the first substance to form a mixture having a greater electrical conductivity than the first substance. The reactant consists of water, reactive metals, bases, and acids. The step of sealing the opening of the reactor comprises closing an adjustable valve. The regulated vacuum is applied to the integrated electrochemical reactor prior to mixing the first and second substances. The step of connecting the integrated electrochemical reactor to the analyzer comprises connecting the integrated electrochemical reactor to an gas analyzer using a releasable grease-free coupling adapted to be connected and disconnected to the analyzer numerous times. A stirbar is movably positionable within the internal volume of the electrochemical reactor for mixing. The mixture for electrolyzing in the electrolysis chamber has a volume of less than 0.5 ml.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic perspective view of an electrolysis reactor received in a glove box.    First tubular side extension (19)    Mixing chamber (21)    Valve stem (53)    Valve cap (61)    Glove box (77)    Through port. (79)