A method for sampling and measuring a hydrogen concentration of a gas in a subsurface formation includes boring a hole in the subsurface formation using a drill string. A gas probe is coupled to a lower end of the drill string. The method also includes opening the gas probe to collect the gas from the subsurface formation. The method also includes drawing the gas up through the drill string after the gas probe is opened. The method also includes measuring the hydrogen concentration of the gas after the gas is drawn up.

Processes for injection of fluids into a wellbore via drill pipe. In some embodiments, the process can include positioning a downhole apparatus on a drill pipe. The process can also include placing the downhole apparatus at a desired station depth within a wellbore. The process can also include attaching a cable to the downhole apparatus from an up-hole environment. The process can also include setting at least one packer to seal a space between at least a portion of the downhole apparatus and an inner surface of the wellbore. The process can also include introducing a fluid to the downhole apparatus through the drill pipe and using a pump to inject at least a portion of the fluid into a geological stratum.