A device to adjust concentration of a first gas in a fluid to a target concentration (Cf) is provided. The device includes a container, having a first opening, the container is configured to receive a first volume (VL) of the fluid through the first opening. Wherein the fluid has an initial concentration (Ci) of the first gas and a second volume (VC) of the container is determined based on the initial concentration (Ci) of the first gas in the fluid, a target concentration (Cf) of the first gas in the fluid, a partition coefficient (φ) of the first gas, and the first volume (VL), and configured to adjust pressure in the container at a predetermined pressure of the first gas to adjust the first gas concentration in the fluid to the target concentration (Cf); wherein the second volume (VC) and the first volume (VL) are correlated by: V C V L = 1 Φ ⁡ [ M C f ⁢ V L + C i C f - 1 ] + 1 in that M is an amount of the first gas required to be introduced in the container to adjust the first gas concentration in the fluid to the target concentration (Cf).