A pressurized containment vessel for a gas/liquid mixture of nitric oxide in deionized and/or deoxygenated water and a system for dispensing the gas/liquid mixture of nitric oxide in deionized and/or deoxygenated water from the containment vessel are provided. The containment vessel and dispensing system are configured so as to maintain the gas/liquid mixture within the containment vessel at a constant pressure above ambient pressure as the gas/liquid mixture of nitric oxide in deionized and/or deoxygenated water is stored in and depleted from the containment vessel thus preventing the nitric oxide from coming out of the solution.
