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: 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).
